Miniature circuit breaker with compact structure

The utility model provides a miniature circuit breaker with a compact structure, which relates to the technical field of circuit breakers and comprises a circuit breaker module, a lead arranged in the circuit breaker module, an electric leakage module arranged on one side of the circuit breaker module and a zero sequence mutual inductor arranged in the electric leakage module. The lead penetrates into the electric leakage module, the lead bypasses the zero-sequence mutual inductor in the electric leakage module and then returns into the circuit breaker module, a fixing mechanism for fixing the lead is arranged on the zero-sequence mutual inductor and comprises a fixing seat arranged on the surface of one side of the zero-sequence mutual inductor, and fixing pieces are oppositely arranged on the inner side of the fixing seat; the wire is arranged on the inner side of the fixing piece in a penetrating mode, and the fixing piece is used for clamping the wire and limiting the wire on one side of the zero sequence