The surge protective devices protect low-voltage consumer systems from overvoltages of all types and are available in single-pole to four-pole versions. The use of high-performance varistors permits a rapid response time and a low protection level, without any line follow current. If circumstances are uncertain and there is a risk of fire from an overload, the internal cut-off unit disconnects the arrestor from the mains if necessary.
The main characteristics of Surge Protecive Devices/SPD as following:
1.Endurable,sustains thousands of strikes;
2.Status indication: Green light in notice window indicates normal; red indicates broken, replacement notice;
3.Protection class: Type 1,Class I;
4. Pole number:1P,2P,3P+N,4P,1+1,3+1;
5.Widely suitable for protecting the buildings to avoid lightning stroke;
6.Build-in temperature control circuit breaker, high security performance;