{"id":3367,"date":"2026-05-26T17:34:06","date_gmt":"2026-05-26T09:34:06","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=3367"},"modified":"2026-10-28T15:37:09","modified_gmt":"2026-10-28T07:37:09","slug":"3-phase-surge-protector-complete-guide","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/de\/blog\/3-phase-surge-protector-complete-guide\/","title":{"rendered":"Leitfaden f\u00fcr dreiphasige \u00dcberspannungsschutzger\u00e4te: Typen, Verdrahtung und Auswahl"},"content":{"rendered":"

Kurze Antwort:<\/strong> A three-phase surge protective device (SPD) limits transient overvoltage on a three-phase AC distribution system. The right device depends on the network arrangement, voltage, lightning exposure, installation point, and equipment withstand level. A 3-pole SPD is not automatically interchangeable with a 3+1 or 4-pole arrangement.<\/p>\n

What a three-phase SPD does<\/h2>\n

An SPD is connected to the power system to limit surge voltage and divert surge current during a short transient. It does not regulate normal voltage, correct long-duration overvoltage, or replace the circuit breaker and earthing system. IEC 61643-11:2025 covers requirements and tests for SPDs connected to AC low-voltage systems. The actual protection at equipment also depends on installation and conductor length.<\/p>\n

Surges may arrive through a utility supply, nearby lightning, or switching operations. Protection must be considered across every conductor that can carry the transient, including the neutral where one is present.<\/p>\n

3P, 4P and 3+1: what changes?<\/h2>\n\n\n\n\n\n\n\n
Arrangement<\/th>\nTypical conductors considered<\/th>\nWhat to verify<\/th>\n<\/tr>\n<\/thead>\n
3P<\/td>\nL1, L2, L3<\/td>\nWhether the installation has a neutral and whether the SPD modes match the earthing system<\/td>\n<\/tr>\n
4P<\/td>\nL1, L2, L3, N<\/td>\nProtection modes and the manufacturer’s wiring diagram<\/td>\n<\/tr>\n
3+1<\/td>\nThree line-to-neutral paths plus a neutral-to-earth path<\/td>\nNetwork type, N-PE component, backup protection and approved connection diagram<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

These labels describe different connection arrangements; they do not by themselves establish suitability. Confirm whether the supply is TN-S, TN-C, TT or IT, whether a neutral is distributed, and the exact device wiring diagram. Do not infer a connection from the number of modules alone.<\/p>\n

Choose Type 1, Type 2 or coordinated stages<\/h2>\n

Typ 1<\/strong> devices are evaluated for lightning-current impulse duty and may be needed at a service entrance where the risk assessment and local rules indicate direct lightning-current exposure. Typ 2<\/strong> devices address induced lightning and switching surges at distribution boards. A combined Typ 1+2<\/strong> device can meet both classifications when its declared ratings match the design. Sensitive downstream equipment may need a coordinated additional stage.<\/p>\n

One large current rating is not a complete design. Check the declared impulse or discharge-current ratings against the location and coordinate the voltage protection level with the equipment withstand level and upstream\/downstream SPDs.<\/p>\n

Seven specifications to check before ordering<\/h2>\n
    \n
  1. System voltage and frequency:<\/strong> record phase-to-phase and phase-to-neutral voltage.<\/li>\n
  2. Earthing and conductor arrangement:<\/strong> identify TN-S, TN-C, TT or IT and whether neutral is present.<\/li>\n
  3. Maximum continuous operating voltage (Uc):<\/strong> match each protection mode to the voltage it can continuously see.<\/li>\n
  4. SPD class and discharge ratings:<\/strong> compare Type 1 Iimp or Type 2 In and Imax using their stated test waveforms.<\/li>\n
  5. Voltage protection level (Up):<\/strong> compare the installed protection level with the equipment’s impulse withstand level.<\/li>\n
  6. Short-circuit and backup protection:<\/strong> check the SPD’s declared short-circuit rating and the manufacturer’s required upstream fuse or breaker.<\/li>\n
  7. Monitoring and maintenance:<\/strong> confirm status indication, remote contact requirements, cartridge replacement procedure and inspection access.<\/li>\n<\/ol>\n

    For a practical product comparison, see Kuangya’s AC SPD-Reihe<\/a>, including KYSPD-12.5T1+2-3P<\/a> und KYSPD-20T2+3-4P<\/a>. Use each product’s current datasheet and wiring diagram to confirm a specific installation.<\/p>\n

    Installation details that affect real protection<\/h2>\n

    Keep the connections from the supply through the SPD to the protective-earth bar short and direct. Long leads add voltage during a surge; Schneider Electric’s installation guide recommends a total connection length of no more than 50 cm where practical. Route phase, neutral and PE conductors together and follow the manufacturer’s conductor-size and backup-protection instructions. A qualified electrician should verify protective bonding, available fault current, isolation and local code requirements before energizing the board.<\/p>\n

    Inspect the status indicator after a significant surge and during scheduled maintenance. Replace a failed cartridge only with the specified compatible part, and investigate repeated disconnection rather than simply replacing modules.<\/p>\n

    H\u00e4ufig gestellte Fragen<\/h2>\n

    Does every three-phase panel need a 4-pole SPD?<\/h3>\n

    No. The correct connection depends on the distributed conductors and earthing arrangement. A three-phase system may have no neutral, and a four-module product may use different internal protection modes from a 3+1 product.<\/p>\n

    Can a breaker replace an SPD?<\/h3>\n

    No. A breaker provides overcurrent protection under its declared conditions. It does not provide the same transient voltage-limiting function as an SPD; the SPD may itself require coordinated backup protection.<\/p>\n

    Is a larger kA number always better?<\/h3>\n

    No. Compare ratings with the same waveform and test class, then consider Uc, Up, system configuration, available fault current and the installed connection. A high discharge rating cannot compensate for incorrect wiring or excessive lead length.<\/p>\n

    Request the right three-phase SPD<\/h2>\n

    Send the distribution-board voltage, earthing system, neutral arrangement, intended installation point, lightning exposure and required Type 1\/Type 2 classification when you contact Kuangya for a selection review<\/a>. For PV inverter systems, also assess the separate DC and AC inverter protection paths<\/a>; an AC SPD is not a substitute for a PV-rated DC SPD.<\/p>\n

    Technische Referenzen:<\/strong> IEC 61643-11:2025<\/a> and Schneider Electric’s SPD-Anschlussanleitung<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

    Choose a three-phase surge protective device by network arrangement, SPD type, Uc, Up, discharge rating and backup protection. Includes 3P, 4P and 3+1 comparison.<\/p>","protected":false},"author":4,"featured_media":3387,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,35],"tags":[],"class_list":["post-3367","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-surge-protection-lightning-safety","category-blog"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/posts\/3367","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/comments?post=3367"}],"version-history":[{"count":3,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/posts\/3367\/revisions"}],"predecessor-version":[{"id":4869,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/posts\/3367\/revisions\/4869"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/media\/3387"}],"wp:attachment":[{"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/media?parent=3367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/categories?post=3367"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnkuangya.com\/de\/wp-json\/wp\/v2\/tags?post=3367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}