... price delivery fast MCB used to protect the line short-circuit and overload, apply to the motor distribution system for lightingdistribution ... , mainly used in AC 50Hz, single pole 230/240V, two very 230/400V, three, four pole 400V lineoverload, short circuit protection, but ... --- yinamy9@gmail [dot] com and sikeqd@126 [dot] com Mini circuit breaker