circuit breaker is applicable to the circuit with an alternating current of 50Hz, rated voltage of ... 126 [dot] com This NB7 series miniature circuit breaker is applicable to the circuit with an alternating current of 50Hz, rated voltage ... In(A)Number of polesRated voltage Ue(V)Rated short circuit capacity lcn (A)B, C type: 1~401230/ ... 40045002,3,4400D type: 1~631230/4002,3,4400 Mini circuit breaker