2p 20kA single phase surge protector This surge protective device( hereinafter referred to as SPD) are suitable for AC 50/60Hz, rated voltage up to 380v IT,TT,TN-C, TN-S,TN-C-S and other power supply system,  it protect to indirect and direct lightning effect or other transient over voltage  SPD design according with GB18802.1/IEC61643-1 standard. Specification details: Model PQ3-20 Poles 2P Max. continious working voltage(Uc) 420V AC(can customized) Nominal discharge current(In) 10kA Max.discharge current(In) 20kA Voltage protection level(Up) 1.5kV Matched circuit breaker/Fuse 32A Response time