Circuit breaker

The utility model discloses a circuit breaker, which comprises a shell, a handle, a moving contact, a static contact and a lock catch mechanism are arranged in the shell, and the lock catch mechanismcomprises a U-shaped connecting rod, a jump pin and a contact support used for installing the moving contact; one end of the U-shaped connecting rod is connected with the handle, the other end of theU-shaped connecting rod is connected with the jump pin, the handle pushes the jump pin to rotate on the contact support through the U-shaped connecting rod, and the contact support compresses the support spring. Wherein the moving contact is installed on the contact support through the contact spring, and the moving contact and the static contact are oppositely arranged; a lock catch matched withthe jump pin is arranged on the contact support; according to the circuit breaker provided by the utility model, the structure of the lock catch mechanism is simple, the locking operation of the circuit breaker is simple and co