Circuit breaker

The utility model discloses a circuit breaker in the technical field of circuit breakers. Including a housing, the two sides of the inner bottom of the shell are each provided with a wire connecting mechanism. The two wire connecting mechanisms are arranged in a mirror image mode with the center line of the shell as the symmetry axis. The wire connecting mechanism comprises a knob and a fixed rod; the fixed rod is fixedly connected to the inner bottom of the shell; the top end of the fixing rod is fixedly connected with a conductive fixing ring; a conductive wiring shaft is rotatably connected into the fixing ring, wiring holes are formed in the wiring shaft, the end, away from the fixing ring, of the wiring shaft penetrates through the shell and is located outside the shell, the wiring shaft is rotatably connected with the shell, the end of the wiring shaft is fixedly connected with the rotary knob, and two receding openings are formed in the shell and located below the two wiring holes respectively. The sch