... Device 1.Surge and overvoltage protection 2.Apply to the power supply such as TN-S,TN-C ... Protective,Surge ,Lightning,Arrester,spdSurge Protective Device,SPD,Surge Arrester,surge protection,surge suppressor, ... Surge Protective Device ,circuit breaker,protective SPD,Surge Lightning ... TN-S,TN-C,TT,IT 3.Rated voltage:380V Surge Protective Device MQU9-C 4P SPD