Residual current circuit breaker

The utility model relates to a residual current circuit breaker, wherein the upper cover of the circuit breaker is provided with a slot which corresponds to the position of an incoming and wiring terminal; a base of a current leakage release is provided with an adaptive gap slot which corresponds to the position of the slot; a conductor comprises a conductive socket connector and a soft lead; one end of the soft lead is connected with the wiring terminal of the current leakage release, and the other end thereof passes through a zero sequence current transformer and is connected with the conductive socket connector; the other end of the conductive socket connector is a connecting end; and the connecting end passes through the gap slot and the slot and is electrically connected with the incoming and wiring terminal. Through the improvement of the conductor connecting structure of a traditional residual current circuit breaker, the utility model substitutes external wiring from the residual current circuit break