웽양 공업구 웨칭 원저우 325000
근무 시간
월요일~금요일: 오전 7시~오후 7시
주말: 주말: 오전 10시 - 오후 5시
Can an SPD work without ground? The technically correct answer is: sometimes a particular protection mode can still operate without a direct PE path, but that does not mean the complete surge-protection system is correctly protected without grounding or bonding.…
Does an SPD protect against overvoltage? Yes, but the answer depends on what type of overvoltage is involved. A surge protective device is primarily designed to limit transient overvoltage, while temporary overvoltage (TOV) and sustained abnormal voltage require a different…
If an EV charger keeps tripping the RCD or RCBO, the protection device is detecting a condition that needs investigation. Common causes include moisture, damaged charging cables, insulation faults, excessive combined leakage, incorrect neutral wiring, the wrong RCD type, overload,…
2P vs 3P DC SPD selection for solar PV often causes confusion. One of the most common questions is: Should I use a 2P or 3P DC SPD? At first glance, the answer seems simple. A PV string has DC…
A 3+1 vs 4+0 SPD comparison often starts with appearance, because both configurations may look almost identical from the outside, especially when they occupy four DIN-rail modules. But electrically, they are not the same. The main difference is the surge…
A surge protective device protects electrical equipment from transient overvoltage, but what protects the SPD if an internal fault or short circuit occurs? This is where the SPD backup fuse or circuit breaker becomes important. However, there is no universal…
Using an AC SPD on a DC system can be dangerous if the device is not specifically rated for the DC application. An AC SPD and a DC SPD may look very similar from the outside, but they are not…
A practical sample approval workflow for OEM buyers: match the exact DC circuit breaker model to its documents, organize evaluation evidence, and define the production reference before ordering.
A common question after a lightning storm, switching event, or unexpected voltage surge is: does an SPD need to be replaced after a surge? The short answer is no—not automatically. A surge protective device is designed to limit transient overvoltage…
If you look at a typical surge protective device (SPD) installation, you may notice something different from a fuse or circuit breaker. A fuse or circuit breaker is normally installed in series with the circuit, so the load current passes…