Thunder-proof circuit breaker

An anti-thunder circuit breaker. An over-current protection circuit and a heat tripping mechanism are connected between input and output of every phase. A contact of the heat tripping mechanism and the output are grounded though Anti-thunder circuit composed of a varistor. The utility model which put the function of a surge protective device into the circuit breaker has the advantages of simple and compact structure, decreasing cost, fixing and using very conveniently and reliable lighing protection performance. Specification and geometry of the Anti-thunder circuit breaker can be made as the current Anti-thunder circuit breaker, so it is convenient to be matching, and installation space needed decreases.