{"id":4015,"date":"2026-07-10T11:28:06","date_gmt":"2026-07-10T03:28:06","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=4015"},"modified":"2026-07-10T11:28:09","modified_gmt":"2026-07-10T03:28:09","slug":"iec-61643-surge-protective-devices-guide","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/ru\/blog\/iec-61643-surge-protective-devices-guide\/","title":{"rendered":"\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 IEC 61643: \u043f\u043e\u043b\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u043c \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0438\u043c\u043f\u0443\u043b\u044c\u0441\u043d\u044b\u0445 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0439"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>\u041f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435:<\/strong> \u0418\u044e\u043b\u044c 2026 \u0433.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">TL;DR: What IEC 61643 Means for SPD Selection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 is one of the most important international standard families for Surge Protective Devices, also known as SPDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For engineers, EPC contractors, solar installers, EV charging station manufacturers, telecom cabinet designers, and industrial electrical teams, IEC 61643 helps answer one key question:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How should surge protective devices be tested, selected, installed, and coordinated for low-voltage electrical systems?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In simple terms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IEC 61643 defines requirements and test methods for SPDs.<\/li>\n\n\n\n<li>SPDs are designed to limit transient overvoltages and divert surge currents.<\/li>\n\n\n\n<li>IEC 61643 applies to different SPD applications, including AC power systems, DC power circuits, photovoltaic systems, and signal or communication lines.<\/li>\n\n\n\n<li>A correct SPD selection should consider voltage, surge current rating, protection level, installation location, earthing system, and coordination with upstream or downstream devices.<\/li>\n\n\n\n<li>IEC 61643 should not be treated as only a certificate name. It should be used as part of real protection design.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For modern electrical infrastructure, IEC 61643 is especially important in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0421\u043e\u043b\u043d\u0435\u0447\u043d\u044b\u0435 \u0444\u043e\u0442\u043e\u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/li>\n\n\n\n<li>\u0421\u0442\u0430\u043d\u0446\u0438\u0438 \u0437\u0430\u0440\u044f\u0434\u043a\u0438 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043c\u043e\u0431\u0438\u043b\u0435\u0439<\/li>\n\n\n\n<li>\u0410\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u044d\u043d\u0435\u0440\u0433\u0438\u0438<\/li>\n\n\n\n<li>\u0426\u0435\u043d\u0442\u0440\u044b \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445<\/li>\n\n\n\n<li>\u0422\u0435\u043b\u0435\u043a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u0448\u043a\u0430\u0444\u044b<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0430\u043d\u0435\u043b\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/li>\n\n\n\n<li>Commercial and low-voltage distribution systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A properly selected SPD can help reduce lightning surge damage, switching transient damage, control board failure, inverter failure, charger downtime, and communication equipment failure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u041d\u0430\u0432\u0438\u0433\u0430\u0446\u0438\u044f<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>What Is IEC 61643?<\/li>\n\n\n\n<li>Why Surge Protective Devices Are Needed<\/li>\n\n\n\n<li>How an SPD Works<\/li>\n\n\n\n<li>Main Parts of the IEC 61643 Standard Family<\/li>\n\n\n\n<li>IEC 61643-01: General Requirements for SPDs<\/li>\n\n\n\n<li>IEC 61643-11: SPDs for AC Low-Voltage Power Systems<\/li>\n\n\n\n<li>IEC 61643-31 and IEC 61643-32: SPDs for Photovoltaic Systems<\/li>\n\n\n\n<li>IEC 61643-41: SPDs for DC Power Circuits<\/li>\n\n\n\n<li>IEC 61643-21 and IEC 61643-22: SPDs for Signal and Communication Lines<\/li>\n\n\n\n<li>Key SPD Parameters Engineers Must Understand<\/li>\n\n\n\n<li>Type 1, Type 2, and Type 3 SPDs<\/li>\n\n\n\n<li>How to Select an SPD for Real Projects<\/li>\n\n\n\n<li>Common SPD Selection Mistakes<\/li>\n\n\n\n<li>Application Examples<\/li>\n\n\n\n<li>\u0427\u0410\u0421\u0422\u041e \u0417\u0410\u0414\u0410\u0412\u0410\u0415\u041c\u042b\u0415 \u0412\u041e\u041f\u0420\u041e\u0421\u042b<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. What Is IEC 61643?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 is a family of international standards for low-voltage surge protective devices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Surge Protective Device, or SPD, is used to protect electrical and electronic equipment against transient overvoltages. These transient overvoltages may come from lightning activity, grid switching, transformer switching, inductive loads, fault events, or other electrical disturbances.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\" rel=\"noopener\">IEC 61643-01<\/a><\/strong> contains common requirements for SPDs and applies to surge protective devices connected to circuits or equipment rated up to 1,000 V AC RMS or 1,500 V DC. It also specifies performance and safety requirements, tests, and ratings for SPDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why IEC 61643 is highly relevant to modern electrical protection projects. Many electrical systems today include sensitive components such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0418\u043d\u0432\u0435\u0440\u0442\u043e\u0440\u044b<\/li>\n\n\n\n<li>Power modules<\/li>\n\n\n\n<li>PLC controllers<\/li>\n\n\n\n<li>Communication boards<\/li>\n\n\n\n<li>Data acquisition devices<\/li>\n\n\n\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0430\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u043d\u044b\u043c\u0438 \u0431\u0430\u0442\u0430\u0440\u0435\u044f\u043c\u0438 (BMS)<\/li>\n\n\n\n<li>EV charger controllers<\/li>\n\n\n\n<li>Telecom equipment<\/li>\n\n\n\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0439 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u0438<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These devices are more sensitive to transient voltage than traditional electrical loads. A short surge event may not destroy a cable, but it can damage a control board, communication module, inverter, charger module, sensor, or monitoring device.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 helps engineers and project teams evaluate SPDs in a more standardized way.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It does not mean every project uses the same SPD. Instead, it helps define how SPDs should be classified, tested, and selected according to the system and risk level.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Why Surge Protective Devices Are Needed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical systems are exposed to transient overvoltages in many situations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common sources include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Surge Source<\/th><th>\u0422\u0438\u043f\u0438\u0447\u043d\u0430\u044f \u043f\u0440\u0438\u0447\u0438\u043d\u0430<\/th><th>\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442<\/th><\/tr><\/thead><tbody><tr><td>\u041c\u043e\u043b\u043d\u0438\u044f<\/td><td>\u041f\u0440\u044f\u043c\u044b\u0435 \u0438\u043b\u0438 \u0431\u043b\u0438\u0437\u043a\u0438\u0435 \u0443\u0434\u0430\u0440\u044b \u043c\u043e\u043b\u043d\u0438\u0438<\/td><td>Equipment breakdown, insulation stress, control board failure<\/td><\/tr><tr><td>Grid switching<\/td><td>Utility switching, capacitor bank switching<\/td><td>Transient overvoltage entering distribution system<\/td><\/tr><tr><td>\u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u043e\u0432<\/td><td>Energization or de-energization<\/td><td>Voltage spikes and electromagnetic disturbance<\/td><\/tr><tr><td>Motor loads<\/td><td>Large inductive loads switching on or off<\/td><td>Transient voltage in local electrical network<\/td><\/tr><tr><td>\u0414\u043b\u0438\u043d\u043d\u044b\u0435 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u044b\u0435 \u043b\u0438\u043d\u0438\u0438<\/td><td>Outdoor cabling, rooftop PV arrays, remote cabinets<\/td><td>Induced surge voltage<\/td><\/tr><tr><td>\u041d\u0435\u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u0435<\/td><td>High impedance grounding path<\/td><td>Increased overvoltage stress<\/td><\/tr><tr><td>Internal faults<\/td><td>Electrical fault or insulation failure<\/td><td>Secondary transient disturbance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A surge may last only microseconds, but the energy can be high enough to damage electronics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In solar PV systems, surges can enter through PV strings, inverter AC terminals, communication lines, or grounding paths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In EV charging stations, surges can enter through utility input, charger cabinets, long cable routes, communication networks, or outdoor installations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In telecom cabinets, surges can enter through power lines, antenna systems, signal cables, or grounding systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In data centers, even a short transient can affect UPS systems, distribution panels, monitoring systems, and network equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is why IEC 61643 is not only a standard for component manufacturers. It is also a practical reference for system designers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. How an SPD Works<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD is designed to limit transient overvoltage and divert surge current away from protected equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In normal operation, the SPD remains in a high-impedance state. It does not carry significant current.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When a transient overvoltage occurs, the SPD changes state and provides a lower-impedance path. This allows surge current to be diverted toward the grounding system or protective path, reducing the voltage stress on downstream equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After the surge event, a properly functioning SPD returns to its normal state.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC descriptions of several SPD standards emphasize that SPDs contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents. For example, IEC 61643-31 applies this principle to SPDs for photovoltaic installations, while IEC 61643-41 applies it to SPDs for DC power circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common SPD technologies include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Metal Oxide Varistor, or MOV<\/li>\n\n\n\n<li>Gas Discharge Tube, or GDT<\/li>\n\n\n\n<li>Spark gap technology<\/li>\n\n\n\n<li>Hybrid protection circuits<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each technology has different characteristics. In real applications, SPD design may combine different components to balance response time, discharge capacity, leakage current, and protection level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD should not be treated like a normal switch or circuit breaker. It does not interrupt load current in the same way as a breaker. It does not replace fuse protection. It does not solve overload problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its job is specific:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Limit transient voltage and divert surge current.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a deeper technical explanation, this <strong><a href=\"https:\/\/cnkuangya.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3\/how-dc-spd-works-operating-principles-components-engineers-guide\/\">\u041f\u0440\u0438\u043d\u0446\u0438\u043f \u0440\u0430\u0431\u043e\u0442\u044b \u0423\u0417\u0418\u041f \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430<\/a><\/strong> guide explains how a DC surge protective device detects a voltage surge and diverts excess energy away from sensitive equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For complete electrical protection, SPD should work together with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u041f\u0440\u0435\u0434\u043e\u0445\u0440\u0430\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430<\/li>\n\n\n\n<li>\u0410\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0432\u044b\u043a\u043b\u044e\u0447\u0430\u0442\u0435\u043b\u0438<\/li>\n\n\n\n<li>\u041d\u0430\u0434\u043b\u0435\u0436\u0430\u0449\u0435\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>Equipotential bonding<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043a\u043b\u0430\u0434\u043a\u0430 \u043a\u0430\u0431\u0435\u043b\u044f<\/li>\n\n\n\n<li>Insulation coordination<\/li>\n\n\n\n<li>Thermal management<\/li>\n\n\n\n<li>Maintenance inspection<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-1024x576.jpg\" alt=\"How a surge protective device diverts transient overvoltage to ground\" class=\"wp-image-4024\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/How-Surge-Protective-Device-Works.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">An SPD limits transient overvoltage by diverting surge current away from protected electrical equipment.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Main Parts of the IEC 61643 Standard Family<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 is not only one document. It is a standard family covering different SPD applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important parts include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>IEC Standard<\/th><th>\u041e\u0441\u043d\u043e\u0432\u043d\u043e\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435<\/th><th>\u041f\u043e\u0447\u0435\u043c\u0443 \u044d\u0442\u043e \u0432\u0430\u0436\u043d\u043e<\/th><\/tr><\/thead><tbody><tr><td>IEC 61643-01<\/td><td>General SPD requirements<\/td><td>Common requirements for SPDs<\/td><\/tr><tr><td>IEC 61643-11<\/td><td>AC low-voltage power system SPDs<\/td><td>Commonly used for AC power distribution<\/td><\/tr><tr><td>IEC 61643-12<\/td><td>Selection and application principles for AC SPDs<\/td><td>Helps with SPD location and coordination<\/td><\/tr><tr><td>IEC 61643-21<\/td><td>Telecom and signalling network SPDs<\/td><td>Important for signal and communication lines<\/td><\/tr><tr><td>IEC 61643-22<\/td><td>Selection and application of telecom and signalling SPDs<\/td><td>Helps protect communication systems<\/td><\/tr><tr><td>IEC 61643-31<\/td><td>SPDs for photovoltaic installations<\/td><td>Important for PV DC-side surge protection<\/td><\/tr><tr><td>IEC 61643-32<\/td><td>Selection and coordination of PV SPDs<\/td><td>Important for PV system design<\/td><\/tr><tr><td>IEC 61643-41<\/td><td>SPDs for DC power circuits<\/td><td>Important for DC electrical systems up to 1,500 V DC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD-1024x683.jpg\" alt=\"IEC 61643 standard family for AC DC PV and signal line surge protective devices\" class=\"wp-image-4023\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/IEC-61643-Standard-Family-for-SPD.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">The IEC 61643 standard family covers surge protective devices for AC systems, DC circuits, PV installations, and communication lines.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Not every project needs every part of IEC 61643.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A commercial AC distribution panel mainly needs AC SPD requirements.<\/li>\n\n\n\n<li>A solar PV system needs PV DC-side SPD requirements.<\/li>\n\n\n\n<li>A telecom cabinet may need both power SPD and signal line SPD.<\/li>\n\n\n\n<li>A data center may need AC power SPD and communication line SPD.<\/li>\n\n\n\n<li>An EV charging station may need AC SPD, DC SPD, and signal line protection depending on the design.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The key is to match the correct IEC 61643 part to the real electrical system.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. IEC 61643-01: General Requirements for SPDs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-01:2024 is important because it provides common requirements for SPDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">According to the IEC official description, IEC 61643-01:2024 applies to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages. It applies to SPDs intended to be connected to circuits or equipment rated up to 1,000 V AC RMS or 1,500 V DC, and it specifies performance and safety requirements, tests, and ratings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For engineers and procurement teams, this means IEC 61643-01 should be understood as a base document.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It helps create a common framework for SPD evaluation, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Product performance<\/li>\n\n\n\n<li>Safety requirements<\/li>\n\n\n\n<li>Ratings<\/li>\n\n\n\n<li>Test methods<\/li>\n\n\n\n<li>Application voltage range<\/li>\n\n\n\n<li>Common SPD terminology<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is important because different industries use different SPD applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A PV DC SPD, an AC distribution SPD, a data line SPD, and a DC power circuit SPD may not be the same product, but they all belong to the broader surge protection logic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When a supplier says an SPD complies with IEC 61643, engineers should ask:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Which part of IEC 61643?<\/li>\n\n\n\n<li>Is it for AC power, DC power, PV, or signal line protection?<\/li>\n\n\n\n<li>\u041a\u0430\u043a\u043e\u0432\u043e \u043d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435?<\/li>\n\n\n\n<li>What is the discharge current?<\/li>\n\n\n\n<li>What is the voltage protection level?<\/li>\n\n\n\n<li>What test report or certificate supports the claim?<\/li>\n\n\n\n<li>Does the SPD match the actual system voltage and earthing arrangement?<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A professional SPD selection process should not stop at the words \u201cIEC 61643 compliant.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It should verify the correct part, rating, and application.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. IEC 61643-11: SPDs for AC Low-Voltage Power Systems<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" rel=\"noopener\">IEC 61643-11<\/a><\/strong> is one of the most commonly referenced standards for AC surge protective devices used in low-voltage AC power systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The IEC official page states that IEC 61643-11:2025 applies to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The earlier IEC 61643-11:2011 version applied to SPDs packaged to be connected to 50\/60 Hz AC power circuits and equipment rated up to 1,000 V RMS. It also stated that such devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For practical engineering, IEC 61643-11 is relevant to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low-voltage AC distribution panels<\/li>\n\n\n\n<li>\u041a\u043e\u043c\u043c\u0435\u0440\u0447\u0435\u0441\u043a\u0438\u0435 \u0437\u0434\u0430\u043d\u0438\u044f<\/li>\n\n\n\n<li>Industrial control cabinets<\/li>\n\n\n\n<li>Data center power systems<\/li>\n\n\n\n<li>Telecom AC input cabinets<\/li>\n\n\n\n<li>EV charger AC input circuits<\/li>\n\n\n\n<li>Solar inverter AC output panels<\/li>\n\n\n\n<li>UPS distribution systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">AC SPDs are often installed at:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0413\u043b\u0430\u0432\u043d\u044b\u0435 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0449\u0438\u0442\u044b<\/li>\n\n\n\n<li>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0449\u0438\u0442\u044b<\/li>\n\n\n\n<li>Equipment input cabinets<\/li>\n\n\n\n<li>Outdoor electrical cabinets<\/li>\n\n\n\n<li>\u041f\u0430\u043d\u0435\u043b\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/li>\n\n\n\n<li>Power supply panels<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">AC SPD Selection Factors<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When selecting an AC SPD, engineers should check:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th><th>\u041f\u043e\u0447\u0435\u043c\u0443 \u044d\u0442\u043e \u0432\u0430\u0436\u043d\u043e<\/th><\/tr><\/thead><tbody><tr><td>Nominal voltage<\/td><td>Must match system voltage<\/td><\/tr><tr><td>\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0440\u0430\u0431\u043e\u0447\u0435\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435<\/td><td>Must tolerate normal voltage conditions<\/td><\/tr><tr><td>SPD type<\/td><td>Type 1, Type 2, or Type 3 according to installation and risk<\/td><\/tr><tr><td>\u041d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0439 \u0442\u043e\u043a<\/td><td>Shows repeated surge handling ability<\/td><\/tr><tr><td>\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0439 \u0442\u043e\u043a<\/td><td>Shows high surge capacity<\/td><\/tr><tr><td>\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u0437\u0430\u0449\u0438\u0442\u044b<\/td><td>Lower value means better downstream protection, if properly selected<\/td><\/tr><tr><td>\u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f<\/td><td>TN, TT, IT systems require different protection design<\/td><\/tr><tr><td>Short-circuit current rating<\/td><td>Must match installation conditions<\/td><\/tr><tr><td>Backup protection<\/td><td>Fuse or breaker coordination may be required<\/td><\/tr><tr><td>\u041a\u043e\u043d\u0442\u0430\u043a\u0442 \u0434\u0438\u0441\u0442\u0430\u043d\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0433\u043d\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438<\/td><td>Useful for monitoring in critical systems<\/td><\/tr><tr><td>Visual indicator<\/td><td>Helps maintenance teams identify end-of-life status<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-1024x576.jpg\" alt=\"AC surge protective device installed in low voltage electrical cabinet under IEC 61643-11\" class=\"wp-image-4032\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/AC-Surge-Protective-Device-IEC-61643-11.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">AC surge protective devices are commonly used in low-voltage distribution panels, industrial cabinets, EV chargers, and data center power systems.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For commercial distribution panels, industrial facilities, EV charger input cabinets, and data center power systems, an <strong><a href=\"https:\/\/cnkuangya.com\/ru\/ac-spd\/\">\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0438\u043c\u043f\u0443\u043b\u044c\u0441\u043d\u044b\u0445 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430<\/a><\/strong> is commonly used to reduce grid-side overvoltage and switching surge damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AC SPDs are especially important in outdoor cabinets, EV charging stations, industrial equipment, and energy infrastructure because these systems often face grid disturbance and environmental exposure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. IEC 61643-31 and IEC 61643-32: SPDs for Photovoltaic Systems<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Solar PV systems require special attention because PV arrays are usually installed outdoors and connected through long DC cable runs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\" rel=\"noopener\">IEC 61643-31<\/a><\/strong> applies to surge protective devices connected to the DC side of photovoltaic installations rated up to 1,500 V DC. These devices are designed for connection to the DC side of photovoltaic installations rated up to 1,500 V DC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-32:2017 describes principles for selection, installation, and coordination of SPDs used in PV systems up to 1,500 V DC and for the AC side of PV systems rated up to 1,000 V RMS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is very important for solar PV protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A PV system may experience surges from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nearby lightning<\/li>\n\n\n\n<li>Long PV string cables<\/li>\n\n\n\n<li>Metal mounting structures<\/li>\n\n\n\n<li>\u042d\u043a\u0441\u043f\u043e\u0437\u0438\u0446\u0438\u044f \u043d\u0430 \u043a\u0440\u044b\u0448\u0435<\/li>\n\n\n\n<li>Ground potential rise<\/li>\n\n\n\n<li>Inverter connection points<\/li>\n\n\n\n<li>AC distribution side<\/li>\n\n\n\n<li>Communication monitoring lines<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">PV surge protection should usually consider both DC and AC sides:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>PV System Area<\/th><th>Protection Consideration<\/th><\/tr><\/thead><tbody><tr><td>PV string side<\/td><td>DC SPD near combiner box or inverter input<\/td><\/tr><tr><td>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u0440\u043e\u0431\u043a\u0430<\/td><td>DC SPD, fuse, isolation<\/td><\/tr><tr><td>\u0412\u0445\u043e\u0434 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0447\u0430\u0441\u0442\u043e\u0442\u044b<\/td><td>DC SPD coordination<\/td><\/tr><tr><td>\u0412\u044b\u0445\u043e\u0434 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430 \u0438\u043d\u0432\u0435\u0440\u0442\u043e\u0440\u0430<\/td><td>AC SPD<\/td><\/tr><tr><td>Monitoring system<\/td><td>Signal line surge protection where needed<\/td><\/tr><tr><td>\u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f<\/td><td>Proper bonding and low impedance path<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In many PV projects, a <strong><a href=\"https:\/\/cnkuangya.com\/ru\/pv-combiner-box\/\">\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u0440\u043e\u0431\u043a\u0430<\/a><\/strong> integrates DC SPD, gPV fuse protection, grounding, and DC isolation before the inverter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why PV DC SPD Is Different<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-1024x576.jpg\" alt=\"PV DC surge protective device inside solar combiner box for IEC 61643-31 protection\" class=\"wp-image-4031\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/PV-DC-SPD-IEC-61643-31-Solar-Protection.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">PV DC SPDs protect photovoltaic strings, combiner boxes, and inverter inputs from lightning-induced transient overvoltage.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A DC SPD for PV systems is not the same as a general AC SPD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For PV arrays, combiner boxes, and energy storage DC circuits, a properly selected <strong><a href=\"https:\/\/cnkuangya.com\/ru\/dc-spd\/\">\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0438\u043c\u043f\u0443\u043b\u044c\u0441\u043d\u044b\u0445 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0439 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430<\/a><\/strong> helps reduce lightning-induced transient overvoltage risk.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PV systems may operate at high DC voltages such as 1,000 V DC or 1,500 V DC. DC circuits also have different arc behavior compared with AC circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because of this, engineers should use SPDs designed and tested for PV DC applications, not simply use an AC SPD in a DC PV circuit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For KUANGYA\u2019s target customers, this topic is especially important because solar PV systems, inverters, combiner boxes, BESS, and EV charging infrastructure often share similar protection logic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A strong PV SPD article can support many internal links across the website.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">8. IEC 61643-41: SPDs for DC Power Circuits<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-1024x576.jpg\" alt=\"DC power circuit surge protective device for EV charging BESS and solar PV systems\" class=\"wp-image-4033\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/DC-Power-Circuit-SPD-IEC-61643-41.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">IEC 61643-41 is important for DC power circuits used in EV charging, BESS, PV systems, and industrial DC cabinets.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As DC systems become more common, DC surge protection is becoming more important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/27917\" rel=\"noopener\">IEC 61643-41<\/a><\/strong> applies to surge protective devices connected to DC power circuits and equipment rated up to 1,500 V DC. These devices are intended to be connected to DC power circuits and equipment rated up to 1,500 V DC. The standard specifies performance and safety requirements, tests, and ratings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is highly relevant to modern applications such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DC fast charging equipment<\/li>\n\n\n\n<li>\u0410\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u044d\u043d\u0435\u0440\u0433\u0438\u0438<\/li>\n\n\n\n<li>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0449\u0438\u0442\u044b \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430<\/li>\n\n\n\n<li>PV-related DC systems<\/li>\n\n\n\n<li>Industrial DC power supply systems<\/li>\n\n\n\n<li>Telecom DC power systems<\/li>\n\n\n\n<li>Power conversion equipment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">DC power systems are becoming more common because many modern energy systems are based on DC conversion and storage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Solar PV arrays generate DC power.<\/li>\n\n\n\n<li>Batteries store DC power.<\/li>\n\n\n\n<li>EV fast chargers use DC output.<\/li>\n\n\n\n<li>Telecom systems often use DC power architecture.<\/li>\n\n\n\n<li>Industrial control systems may include DC auxiliary circuits.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For these systems, surge protection design must consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u041d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/li>\n\n\n\n<li>\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0440\u0430\u0431\u043e\u0447\u0435\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>DC fault behavior<\/li>\n\n\n\n<li>Grounding arrangement<\/li>\n\n\n\n<li>\u0414\u043b\u0438\u043d\u0430 \u043a\u0430\u0431\u0435\u043b\u044f<\/li>\n\n\n\n<li>\u0423\u0441\u043b\u043e\u0432\u0438\u044f \u043e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0435\u0439 \u0441\u0440\u0435\u0434\u044b \u043f\u0440\u0438 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0435<\/li>\n\n\n\n<li>Coordination with upstream and downstream protection devices<\/li>\n\n\n\n<li>Suitable DC SPD standards and test requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">DC SPD selection is especially important because using the wrong SPD can create safety and reliability problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A DC circuit should be protected with products designed for DC applications.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">9. IEC 61643-21 and IEC 61643-22: SPDs for Signal and Communication Lines<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern electrical systems are not only power circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They also include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ethernet communication<\/li>\n\n\n\n<li>RS485 communication<\/li>\n\n\n\n<li>Sensor lines<\/li>\n\n\n\n<li>Fire alarm signals<\/li>\n\n\n\n<li>Monitoring cables<\/li>\n\n\n\n<li>Data acquisition systems<\/li>\n\n\n\n<li>Remote control lines<\/li>\n\n\n\n<li>Telecom networks<\/li>\n\n\n\n<li>Building management systems<\/li>\n\n\n\n<li>OCPP communication for EV chargers<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\" rel=\"noopener\">IEC 61643-21<\/a><\/strong> applies to surge protective devices connected to telecommunications and signalling networks, including networks that may also provide power on the same line such as PoE. The IEC description states that these devices are intended to be connected to telecommunications and signalling networks and equipment rated up to 1,000 V RMS and 1,500 V DC. It also notes that these networks can provide power on the same line, such as Power over Ethernet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-22:2015 describes principles for selection, operation, location, and coordination of SPDs connected to telecommunication and signalling networks with nominal system voltages up to 1,000 V RMS AC and 1,500 V DC. It also covers multiservice SPDs that include protection for signalling lines and power lines in the same enclosure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This matters because a surge can damage a system through the communication side even when the power side is protected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A telecom cabinet may have AC or DC power protection, but an unprotected signal cable can still introduce surge energy.<\/li>\n\n\n\n<li>A data center may protect the UPS input, but network equipment can still be exposed through communication lines.<\/li>\n\n\n\n<li>An EV charger may have power SPD, but network or payment modules may fail after a surge event.<\/li>\n\n\n\n<li>A PV inverter may have DC and AC SPD, but monitoring communication may still be vulnerable.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, complete surge protection should review both power lines and signal lines.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">10. Key SPD Parameters Engineers Must Understand<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SPD selection requires more than choosing a voltage and price.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineers should understand the following parameters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043d\u0435\u043f\u0440\u0435\u0440\u044b\u0432\u043d\u043e\u0435 \u0440\u0430\u0431\u043e\u0447\u0435\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Maximum continuous operating voltage is the voltage the SPD can continuously withstand without operating incorrectly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the value is too low, the SPD may age quickly or fail under normal operating conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the value is too high, the voltage protection level may not be suitable for sensitive equipment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u0437\u0430\u0449\u0438\u0442\u044b \u043f\u043e \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044e<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Voltage protection level indicates the residual voltage that remains during surge discharge under test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A lower protection level can help protect downstream equipment, but it must be selected together with the system voltage, SPD type, and installation conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Long cable length and poor installation may increase the actual voltage seen by protected equipment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0442\u043e\u043a \u0440\u0430\u0437\u0440\u044f\u0434\u0430<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nominal discharge current represents the surge current level the SPD can handle under specified test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is important for repeated surge exposure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0442\u043e\u043a \u0440\u0430\u0437\u0440\u044f\u0434\u0430<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Maximum discharge current indicates a higher surge current capability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This parameter is often highlighted in product marketing, but engineers should not select an SPD only by the biggest number. The correct value depends on site risk, installation level, and coordination.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Impulse Current<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Impulse current is especially relevant for Type 1 SPDs, which are used where lightning current may be expected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is important in installations with external lightning protection systems or high lightning exposure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0422\u0438\u043f \u0421\u041f\u0414<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD type indicates where and how the SPD is usually applied.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common classifications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0422\u0438\u043f 1 \u0421\u041f\u0414<\/li>\n\n\n\n<li>\u0422\u0438\u043f 2 \u0421\u041f\u0414<\/li>\n\n\n\n<li>\u0422\u0438\u043f 3 \u0421\u041f\u0414<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each type has different test conditions and application purposes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Short-Circuit Current Rating<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The SPD must be suitable for the available short-circuit current at the installation point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the short-circuit capability is not suitable, failure conditions may become unsafe.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Backup Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Some SPD installations require upstream fuse or circuit breaker protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The backup protection must be coordinated with the SPD according to manufacturer requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Visual Indicator<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A visual indicator helps maintenance teams identify whether an SPD module is still functional or has reached end of life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Remote Signal Contact<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A remote signal contact is useful in critical systems such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0426\u0435\u043d\u0442\u0440\u044b \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445<\/li>\n\n\n\n<li>Telecom sites<\/li>\n\n\n\n<li>EV charging networks<\/li>\n\n\n\n<li>PV power plants<\/li>\n\n\n\n<li>BESS cabinets<\/li>\n\n\n\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0439 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u0438<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It allows the SPD status to be monitored remotely.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-1024x576.jpg\" alt=\"Type 1 Type 2 and Type 3 SPD coordination in electrical distribution system\" class=\"wp-image-4025\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-1024x576.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-300x169.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-768x432.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-1536x864.jpg 1536w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-18x10.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination-600x338.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Type-1-Type-2-Type-3-SPD-Coordination.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Coordinated SPD protection reduces surge energy from the main entrance to equipment-level protection.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">11. Type 1, Type 2, and Type 3 SPDs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SPD type is one of the most important concepts in IEC 61643-related discussions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0422\u0438\u043f 1 \u0421\u041f\u0414<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Type 1 SPDs are designed to handle high-energy lightning current components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are usually installed near the service entrance or main distribution board where lightning current may enter the electrical system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical use cases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Buildings with external lightning protection systems<\/li>\n\n\n\n<li>\u0413\u043b\u0430\u0432\u043d\u044b\u0435 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0449\u0438\u0442\u044b<\/li>\n\n\n\n<li>High lightning exposure sites<\/li>\n\n\n\n<li>Industrial facilities<\/li>\n\n\n\n<li>Large energy infrastructure projects<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Type 1 SPD is not automatically required for every installation. It depends on lightning risk, building design, local electrical rules, and project requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0422\u0438\u043f 2 \u0421\u041f\u0414<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Type 2 SPDs are widely used in low-voltage distribution systems to protect against switching surges and induced lightning surges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are often installed in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0430\u043d\u0435\u043b\u0438<\/li>\n\n\n\n<li>Solar inverter cabinets<\/li>\n\n\n\n<li>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043a\u043e\u0440\u043e\u0431\u043a\u0438<\/li>\n\n\n\n<li>EV charger cabinets<\/li>\n\n\n\n<li>Industrial control cabinets<\/li>\n\n\n\n<li>Telecom power cabinets<\/li>\n\n\n\n<li>Commercial electrical systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For many solar PV and industrial applications, Type 2 SPD is the most commonly used protection level.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0422\u0438\u043f 3 \u0421\u041f\u0414<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Type 3 SPDs are usually installed close to sensitive equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They provide local protection, often after upstream Type 1 or Type 2 protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical use cases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0427\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u0438\u043a\u0430<\/li>\n\n\n\n<li>Control equipment<\/li>\n\n\n\n<li>Communication equipment<\/li>\n\n\n\n<li>Office equipment<\/li>\n\n\n\n<li>Local equipment-level protection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Type 3 SPDs should not be used as the only protection layer in high-risk installations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SPD Coordination<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Type 1, Type 2, and Type 3 SPDs may be used together in a coordinated protection system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The goal is to reduce surge energy step by step:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Main entrance protection \u2192 Distribution protection \u2192 Equipment-level protection<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This layered design is important in large facilities such as data centers, factories, telecom sites, and EV charging stations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">12. How to Select an SPD for Real Projects<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A practical SPD selection process should follow a structured method.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Identify the System Type<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First, confirm the system type:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AC low-voltage distribution<\/li>\n\n\n\n<li>DC power circuit<\/li>\n\n\n\n<li>Solar PV DC circuit<\/li>\n\n\n\n<li>EV charging station<\/li>\n\n\n\n<li>Telecom signal network<\/li>\n\n\n\n<li>Data center power system<\/li>\n\n\n\n<li>Industrial control cabinet<\/li>\n\n\n\n<li>BESS DC cabinet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Different systems may need different IEC 61643 references.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Confirm System Voltage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nominal voltage<\/li>\n\n\n\n<li>\u041c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0440\u0430\u0431\u043e\u0447\u0435\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>AC or DC system<\/li>\n\n\n\n<li>System grounding<\/li>\n\n\n\n<li>\u041a\u043e\u043b\u0435\u0431\u0430\u043d\u0438\u044f \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f<\/li>\n\n\n\n<li>PV open-circuit voltage where applicable<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect voltage selection is one of the most common SPD mistakes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Check Installation Location<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD location affects its type and rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical locations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Main distribution board<\/li>\n\n\n\n<li>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u043f\u043b\u0430\u0442\u0430<\/li>\n\n\n\n<li>Equipment input cabinet<\/li>\n\n\n\n<li>\u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u0440\u043e\u0431\u043a\u0430<\/li>\n\n\n\n<li>\u0412\u0445\u043e\u0434 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0447\u0430\u0441\u0442\u043e\u0442\u044b<\/li>\n\n\n\n<li>\u0412\u044b\u0445\u043e\u0434 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430 \u0438\u043d\u0432\u0435\u0440\u0442\u043e\u0440\u0430<\/li>\n\n\n\n<li>\u0428\u043a\u0430\u0444 \u0437\u0430\u0440\u044f\u0434\u043d\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043c\u043e\u0431\u0438\u043b\u0435\u0439<\/li>\n\n\n\n<li>Telecom power cabinet<\/li>\n\n\n\n<li>Signal line entrance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Evaluate Lightning and Surge Risk<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u0442\u0435:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Local lightning density<\/li>\n\n\n\n<li>Outdoor installation<\/li>\n\n\n\n<li>\u0414\u043b\u0438\u043d\u0430 \u043a\u0430\u0431\u0435\u043b\u044f<\/li>\n\n\n\n<li>Building height<\/li>\n\n\n\n<li>Rooftop PV installation<\/li>\n\n\n\n<li>Nearby metal structures<\/li>\n\n\n\n<li>Existing lightning protection system<\/li>\n\n\n\n<li>Grid quality<\/li>\n\n\n\n<li>Criticality of the equipment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">High-risk sites may need stronger SPD coordination.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Confirm SPD Type<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Choose Type 1, Type 2, or Type 3 according to installation point and risk level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Main entrance with lightning risk: Type 1 or Type 1+2 may be considered.<\/li>\n\n\n\n<li>Distribution cabinet: Type 2 is commonly used.<\/li>\n\n\n\n<li>Sensitive equipment side: Type 3 may be used as supplementary protection.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6: Check Discharge Current Rating<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Select the discharge current rating according to risk level and application.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not choose only based on the largest advertised current.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A balanced design should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Project risk<\/li>\n\n\n\n<li>Standard requirement<\/li>\n\n\n\n<li>Equipment sensitivity<\/li>\n\n\n\n<li>Installation level<\/li>\n\n\n\n<li>\u0421\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u044f<\/li>\n\n\n\n<li>\u041d\u0430\u0434\u0435\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0434\u0443\u043a\u0446\u0438\u0438<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 7: Check Voltage Protection Level<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The voltage protection level should be suitable for downstream equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sensitive electronics may require lower residual voltage, but installation cable length and coordination must also be considered.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 8: Confirm Backup Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check whether the SPD requires backup fuse or breaker protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The backup protection must follow product datasheet requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 9: Plan Maintenance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD is not a \u201cset and forget\u201d device.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maintenance teams should check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Visual indicator<\/li>\n\n\n\n<li>Remote alarm<\/li>\n\n\n\n<li>Module replacement condition<\/li>\n\n\n\n<li>Tightness of terminals<\/li>\n\n\n\n<li>Grounding condition<\/li>\n\n\n\n<li>Signs of overheating<\/li>\n\n\n\n<li>Surge event history where monitoring is available<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For critical systems, remote signal contacts are recommended.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">13. Common SPD Selection Mistakes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 1: Using AC SPD in DC Applications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is a serious mistake.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AC SPDs and DC SPDs are not always interchangeable. DC circuits have different characteristics, and DC-rated SPDs should be used for DC systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For PV systems, use SPDs intended for photovoltaic DC applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For DC power circuits, use SPDs designed for DC power applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 2: Selecting Only by Maximum Discharge Current<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A large maximum discharge current number does not automatically mean better protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineers should also check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u0437\u0430\u0449\u0438\u0442\u044b<\/li>\n\n\n\n<li>\u041d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0439 \u0442\u043e\u043a<\/li>\n\n\n\n<li>\u041d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/li>\n\n\n\n<li>SPD type<\/li>\n\n\n\n<li>Short-circuit rating<\/li>\n\n\n\n<li>Backup protection<\/li>\n\n\n\n<li>\u0421\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f<\/li>\n\n\n\n<li>Installation position<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 3: Ignoring Grounding<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD performance depends heavily on grounding and bonding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Poor grounding can reduce protection effectiveness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A good SPD needs a suitable discharge path.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 4: Long Connection Cables<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Long SPD connection leads can increase residual voltage at the protected equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Short, straight, and properly routed connections are important for surge protection performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 5: No Coordination Between SPDs<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If multiple SPDs are used, they should be coordinated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Poor coordination may cause the wrong device to operate, reduce protection effectiveness, or increase maintenance problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 6: No Maintenance Plan<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD modules may age after repeated surge events.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A visual indicator or remote signal contact helps maintenance teams identify failed modules.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Without inspection, a failed SPD may remain unnoticed until the next surge damages equipment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mistake 7: Treating SPD as a Fuse or Breaker<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD is not a fuse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD is not a circuit breaker.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineers comparing protection functions can read this <strong><a href=\"https:\/\/cnkuangya.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3\/dc-fuse-vs-dc-spd\/\">DC Fuse vs DC SPD<\/a><\/strong> guide to understand why fuses protect against overcurrent while SPDs protect against transient overvoltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD limits transient overvoltage and diverts surge current. It does not replace overcurrent protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Complete electrical protection should include SPD, fuse, circuit breaker, grounding, cable protection, and thermal safety where needed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">14. Application Examples<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">14.1 Solar Inverter Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Solar inverters are exposed to both DC-side and AC-side surges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a complete application example, read this <strong><a href=\"https:\/\/cnkuangya.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3\/solar-inverter-protection\/\">\u0437\u0430\u0449\u0438\u0442\u0430 \u0441\u043e\u043b\u043d\u0435\u0447\u043d\u043e\u0433\u043e \u0438\u043d\u0432\u0435\u0440\u0442\u043e\u0440\u0430<\/a><\/strong> guide covering DC SPD, AC SPD, PV fuse coordination, arc faults, and cabinet safety.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical protection strategy may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DC SPD at PV string or combiner box side<\/li>\n\n\n\n<li>DC SPD near inverter input<\/li>\n\n\n\n<li>AC SPD at inverter output<\/li>\n\n\n\n<li>Proper grounding and bonding<\/li>\n\n\n\n<li>Fuse protection for PV strings<\/li>\n\n\n\n<li>Monitoring for critical systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For EV infrastructure projects, this <strong><a href=\"https:\/\/cnkuangya.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3\/ev-charging-station-electrical-protection\/\">EV charging station electrical protection<\/a><\/strong> guide explains how SPD, fuse protection, grounding, cabinet fire safety, and maintenance work together.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u043e\u043b\u043d\u044b\u0439 <strong><a href=\"https:\/\/cnkuangya.com\/ru\/dc-photovoltaic-protection\/\">DC photovoltaic protection<\/a><\/strong> design should coordinate DC SPD, gPV fuse protection, DC circuit breakers, disconnectors, and grounding inside PV combiner boxes or inverter input circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PV systems should refer to IEC 61643-31 for PV SPD requirements and IEC 61643-32 for selection, installation, and coordination principles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">14.2 EV Charging Station Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">EV charging stations include AC input, power modules, DC output circuits, communication systems, and outdoor cabinets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical protection strategy may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AC SPD at charger input<\/li>\n\n\n\n<li>DC SPD where required by design<\/li>\n\n\n\n<li>Signal line SPD for communication systems where needed<\/li>\n\n\n\n<li>Fuse protection for DC circuits<\/li>\n\n\n\n<li>\u041d\u0430\u0434\u043b\u0435\u0436\u0430\u0449\u0435\u0435 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>Cabinet fire safety<\/li>\n\n\n\n<li>Maintenance inspection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 helps engineers evaluate SPD selection for both AC and DC parts of the charging system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">14.3 BESS Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Battery Energy Storage Systems contain high-value DC equipment, power conversion systems, control boards, battery management systems, and communication modules.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical protection strategy may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DC SPD for battery-side or DC distribution circuits<\/li>\n\n\n\n<li>AC SPD for PCS output or grid connection<\/li>\n\n\n\n<li>Signal line SPD for monitoring systems<\/li>\n\n\n\n<li>Fuse protection for DC fault isolation<\/li>\n\n\n\n<li>Cabinet fire suppression<\/li>\n\n\n\n<li>\u0422\u0435\u043f\u043b\u043e\u0432\u043e\u0439 \u043c\u043e\u043d\u0438\u0442\u043e\u0440\u0438\u043d\u0433<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For BESS projects, SPD selection should be part of a broader electrical and fire safety strategy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Battery storage projects should also review <strong><a href=\"https:\/\/cnkuangya.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3\/battery-energy-storage-fire-protection-guide\/\">\u043f\u0440\u043e\u0442\u0438\u0432\u043e\u043f\u043e\u0436\u0430\u0440\u043d\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u0441\u0438\u0441\u0442\u0435\u043c \u043d\u0430\u043a\u043e\u043f\u043b\u0435\u043d\u0438\u044f \u044d\u043d\u0435\u0440\u0433\u0438\u0438 \u043d\u0430 \u0430\u043a\u043a\u0443\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430\u0445<\/a><\/strong> because surge events, overcurrent faults, thermal conditions, and cabinet safety must be evaluated together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">14.4 Telecom Cabinet Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Telecom cabinets may include AC input, DC power supply, batteries, communication equipment, signal lines, and outdoor enclosures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical protection strategy may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AC or DC SPD for power input<\/li>\n\n\n\n<li>Signal line SPD<\/li>\n\n\n\n<li>Proper grounding and bonding<\/li>\n\n\n\n<li>Cabinet fire safety<\/li>\n\n\n\n<li>Temperature and humidity control<\/li>\n\n\n\n<li>Remote SPD status monitoring<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-21 and IEC 61643-22 are especially relevant when protecting telecommunication and signalling networks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">14.5 Data Center Protection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Data centers require high availability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Surge events can affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u044b \u0431\u0435\u0441\u043f\u0435\u0440\u0435\u0431\u043e\u0439\u043d\u043e\u0433\u043e \u043f\u0438\u0442\u0430\u043d\u0438\u044f<\/li>\n\n\n\n<li>Switchgear<\/li>\n\n\n\n<li>Power distribution units<\/li>\n\n\n\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u044b \u043c\u043e\u043d\u0438\u0442\u043e\u0440\u0438\u043d\u0433\u0430<\/li>\n\n\n\n<li>\u041a\u043e\u043c\u043c\u0443\u043d\u0438\u043a\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u0441\u0435\u0442\u0438<\/li>\n\n\n\n<li>Server support equipment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A data center surge protection strategy may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type 1 or Type 2 SPD at main distribution level<\/li>\n\n\n\n<li>Type 2 SPD at downstream panels<\/li>\n\n\n\n<li>Type 3 SPD near sensitive equipment where needed<\/li>\n\n\n\n<li>Signal line protection<\/li>\n\n\n\n<li>\u0423\u0434\u0430\u043b\u0435\u043d\u043d\u044b\u0439 \u043c\u043e\u043d\u0438\u0442\u043e\u0440\u0438\u043d\u0433<\/li>\n\n\n\n<li>Maintenance inspection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For lightning electromagnetic impulse protection inside structures, IEC 62305-4:2024 provides requirements for surge protection measures for electrical and electronic systems to reduce the risk of permanent failures due to lightning electromagnetic impulse.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">15. IEC 61643 and IEC 62305: What Is the Difference?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 and IEC 62305 are related, but they are not the same.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 focuses on surge protective devices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 62305 focuses on lightning protection of structures and the related risk management and protection measures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 62305-1:2024 provides general principles for protection of structures against lightning, including their installations, contents, and persons.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\" rel=\"noopener\">IEC 62305-4<\/a><\/strong> provides requirements for surge protection measures for electrical and electronic systems inside structures, helping reduce the risk of permanent failures caused by lightning electromagnetic impulse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In practical projects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IEC 62305 helps evaluate lightning protection and structure-level risk.<\/li>\n\n\n\n<li>IEC 61643 helps evaluate SPD product requirements, selection, and application.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For large projects, both may be considered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A building with external lightning protection may need Type 1 SPD at the main entrance.<\/li>\n\n\n\n<li>A solar PV system on a rooftop may need PV DC SPD and AC SPD.<\/li>\n\n\n\n<li>A data center may need coordinated SPD protection across different distribution levels.<\/li>\n\n\n\n<li>An EV charging site may need site-level and cabinet-level SPD protection depending on exposure.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">16. Recommended KUANGYA SPD Selection Logic<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For customers selecting KUANGYA surge protective devices, the first step should be application matching.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For Solar PV Systems<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For PV projects, this <strong><a href=\"https:\/\/cnkuangya.com\/ru\/%d0%b1%d0%bb%d0%be%d0%b3\/solar-pv-protection-spd-fuse-fire-suppression\/\">Solar PV protection strategy<\/a><\/strong> explains how SPD systems, DC fuse coordination, and fire suppression work as a layered protection chain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended product direction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DC SPD for PV strings and combiner boxes<\/li>\n\n\n\n<li>1000 V DC or 1500 V DC according to system voltage<\/li>\n\n\n\n<li>Type 2 or Type 1+2 according to project risk<\/li>\n\n\n\n<li>Fuse and isolation coordination<\/li>\n\n\n\n<li>AC SPD at inverter output side where required<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">For EV Charging Stations<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended product direction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AC SPD for charger input side<\/li>\n\n\n\n<li>DC SPD where required by system design<\/li>\n\n\n\n<li>Signal line protection where communication risk exists<\/li>\n\n\n\n<li>Fuse protection for DC circuits<\/li>\n\n\n\n<li>Cabinet fire safety for enclosed charger cabinets<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">For Industrial Control Cabinets<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended product direction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AC SPD for incoming power<\/li>\n\n\n\n<li>Signal SPD for PLC and communication lines where needed<\/li>\n\n\n\n<li>Proper grounding and short connection wiring<\/li>\n\n\n\n<li>Cabinet fire suppression where electrical fire risk exists<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">For Telecom Cabinets<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended product direction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AC or DC SPD according to power architecture<\/li>\n\n\n\n<li>Signal line SPD for communication paths<\/li>\n\n\n\n<li>Remote signal contact for maintenance<\/li>\n\n\n\n<li>Outdoor cabinet protection and grounding<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">For Data Centers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended product direction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coordinated Type 1, Type 2, and Type 3 SPD design where required<\/li>\n\n\n\n<li>AC SPD for distribution panels<\/li>\n\n\n\n<li>Signal protection for monitoring or communication lines<\/li>\n\n\n\n<li>Remote SPD status monitoring<\/li>\n\n\n\n<li>Maintenance-friendly modular design<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The correct SPD is not simply the most expensive one or the one with the largest current rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct SPD is the one that matches:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u041d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/li>\n\n\n\n<li>\u0422\u0438\u043f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f<\/li>\n\n\n\n<li>\u041c\u0435\u0441\u0442\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438<\/li>\n\n\n\n<li>Surge risk<\/li>\n\n\n\n<li>Standard requirement<\/li>\n\n\n\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0437\u0430\u0437\u0435\u043c\u043b\u0435\u043d\u0438\u044f<\/li>\n\n\n\n<li>Maintenance plan<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">17. Practical SPD Selection Checklist<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before ordering SPDs, engineers and buyers should confirm the following information:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0412\u043e\u043f\u0440\u043e\u0441<\/th><th>\u041f\u043e\u0447\u0435\u043c\u0443 \u044d\u0442\u043e \u0432\u0430\u0436\u043d\u043e<\/th><\/tr><\/thead><tbody><tr><td>Is the system AC or DC?<\/td><td>AC and DC SPDs are not always interchangeable<\/td><\/tr><tr><td>What is the nominal voltage?<\/td><td>SPD voltage must match the system<\/td><\/tr><tr><td>What is the maximum operating voltage?<\/td><td>SPD must tolerate normal voltage conditions<\/td><\/tr><tr><td>What is the installation location?<\/td><td>Main panel, sub-panel, inverter, cabinet, or equipment side<\/td><\/tr><tr><td>What SPD type is required?<\/td><td>Type 1, Type 2, Type 3, or combined type<\/td><\/tr><tr><td>What is the surge risk level?<\/td><td>Determines discharge capacity and coordination<\/td><\/tr><tr><td>Is there an external lightning protection system?<\/td><td>May require higher-level protection<\/td><\/tr><tr><td>What is the earthing system?<\/td><td>Affects SPD configuration<\/td><\/tr><tr><td>Is backup protection required?<\/td><td>Fuse or breaker coordination may be necessary<\/td><\/tr><tr><td>Is remote monitoring required?<\/td><td>Important for critical infrastructure<\/td><\/tr><tr><td>Is the environment outdoor or indoor?<\/td><td>Affects enclosure and durability requirements<\/td><\/tr><tr><td>Is the application PV, EV, BESS, telecom, or industrial?<\/td><td>Different standards and ratings may apply<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643-1024x683.jpg\" alt=\"Electrical engineer checking SPD selection checklist according to IEC 61643\" class=\"wp-image-4034\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/07\/Engineer-SPD-Selection-Checklist-IEC-61643.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Engineers should confirm voltage, SPD type, discharge current, grounding, backup protection, and monitoring before selecting an SPD.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This checklist helps reduce wrong purchases and improves project reliability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For EPC contractors, it is better to confirm these details before quotation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For distributors, this checklist helps prevent customers from selecting the wrong SPD model.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For end users, it helps explain why a cheaper SPD may not be suitable for a high-risk installation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">18. FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. What is IEC 61643?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 is a family of international standards for surge protective devices. It covers requirements, test methods, selection principles, and application rules for SPDs used in low-voltage AC systems, DC systems, photovoltaic systems, and communication networks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. What does an SPD do?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD limits transient overvoltage and diverts surge current away from protected equipment. It helps reduce damage caused by lightning surges, grid switching, and other transient electrical disturbances.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Is IEC 61643 only for AC SPDs?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. IEC 61643 includes different parts for AC power systems, DC power circuits, PV installations, and telecommunications or signalling networks. The correct part depends on the application.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. What is the difference between IEC 61643-11 and IEC 61643-31?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-11 is commonly associated with SPDs for AC low-voltage power systems. IEC 61643-31 applies to SPDs for the DC side of photovoltaic installations rated up to 1,500 V DC.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Can I use an AC SPD for a DC solar system?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. A DC solar system should use an SPD designed for PV DC applications. AC and DC circuits have different voltage and fault characteristics, and using the wrong SPD may create safety and reliability risks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. What is the difference between Type 1 and Type 2 SPD?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Type 1 SPDs are typically used where lightning current may enter the electrical system, such as at the main distribution entrance. Type 2 SPDs are widely used in distribution panels and equipment cabinets to reduce induced lightning and switching surges.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. Do SPDs replace fuses or circuit breakers?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. SPDs do not replace fuses or circuit breakers. An SPD limits transient overvoltage and diverts surge current. Fuses and breakers provide overcurrent and short-circuit protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8. Why is grounding important for SPD performance?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An SPD needs a proper path to divert surge current. Poor grounding or long connection wires can reduce protection effectiveness and increase residual voltage at the protected equipment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">9. Where should an SPD be installed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPD location depends on the system design. Common locations include main distribution boards, sub-distribution boards, PV combiner boxes, inverter inputs, EV charger cabinets, telecom cabinets, and near sensitive equipment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">10. How often should SPDs be inspected?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SPDs should be inspected regularly as part of electrical maintenance. Maintenance teams should check the visual indicator, remote alarm status, terminals, grounding, and signs of overheating or damage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">11. What information should I provide before selecting an SPD?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You should provide system voltage, AC or DC type, installation location, earthing system, expected surge risk, equipment type, required SPD type, short-circuit level, and whether remote monitoring is required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">12. Why does IEC 61643 matter for EPC projects?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 helps EPC contractors select SPDs according to recognized requirements and application principles. It reduces the risk of wrong product selection and supports more reliable electrical protection design.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643 is not just a standard number on a datasheet. It is a practical framework for selecting and applying surge protective devices in real electrical systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For modern energy and industrial infrastructure, surge protection is no longer optional. Solar PV systems, EV charging stations, BESS cabinets, telecom sites, data centers, and industrial control panels all contain sensitive electronic equipment that can be damaged by transient overvoltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A complete surge protection design should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Correct IEC 61643 application<\/li>\n\n\n\n<li>AC or DC system type<\/li>\n\n\n\n<li>SPD type and rating<\/li>\n\n\n\n<li>\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u0437\u0430\u0449\u0438\u0442\u044b<\/li>\n\n\n\n<li>Discharge current capability<\/li>\n\n\n\n<li>Grounding and bonding<\/li>\n\n\n\n<li>Backup protection<\/li>\n\n\n\n<li>\u041c\u0435\u0441\u0442\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438<\/li>\n\n\n\n<li>Coordination between devices<\/li>\n\n\n\n<li>Maintenance and monitoring<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">KUANGYA provides surge protective devices for solar PV systems, EV charging stations, industrial cabinets, telecom equipment, data centers, and other electrical infrastructure projects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For project selection, OEM cooperation, or technical datasheets, contact KUANGYA for SPD solutions designed for real electrical protection applications.<\/p>","protected":false},"excerpt":{"rendered":"<p>Last Updated: July 2026 TL;DR: What IEC 61643 Means for SPD Selection IEC 61643 is one of the most important international standard families for Surge Protective Devices, also known as SPDs. For engineers, EPC contractors, solar installers, EV charging station manufacturers, telecom cabinet designers, and industrial electrical teams, IEC 61643 helps answer one key question: [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":4021,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-4015","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/posts\/4015","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/comments?post=4015"}],"version-history":[{"count":1,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/posts\/4015\/revisions"}],"predecessor-version":[{"id":4035,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/posts\/4015\/revisions\/4035"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/media\/4021"}],"wp:attachment":[{"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/media?parent=4015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/categories?post=4015"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnkuangya.com\/ru\/wp-json\/wp\/v2\/tags?post=4015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}