Low-voltage power grid transfer circuit breaker

The circuit breaker comprises a circuit breaker main body, a plurality of wiring terminals and a plurality of wiring harness restraining mechanisms are installed in the top end and the bottom end of the circuit breaker main body, and each wiring harness restraining mechanism comprises a bottom plate, a plurality of movable seats and a pressing plate. And a cable connected with the circuit breaker main body passes through the wire harness constraint mechanism and is bent to be connected with the wiring terminal. According to the invention, through the arrangement of the wire harness restraining mechanism, after a worker loosens a cable from a wiring terminal, the movable seat can drive the cable to be separated from the wiring terminal by shifting the movable seat, so that the cable is still limited on the movable seat while being far away from the circuit breaker main body; the phenomenon of electric leakage caused by the fact that a cable separated from the circuit breaker body is in contact with other objec