Moving contact limiting structure of circuit breaker and circuit breaker

The utility model relates to the field of low-voltage electric appliances, in particular to a moving contact limiting structure of a circuit breaker, which comprises a circuit breaker shell and a limiting piece, and the circuit breaker shell further comprises at least one assembly cavity for accommodating a moving contact which is pivotally arranged. The two ends of the limiting piece are respectively in detachable limiting fit with a pair of mounting side walls of the assembling cavity, so that the limiting piece is fixedly arranged in the assembling cavity and is used for stopping the moving contact rotating towards the breaking direction; the utility model also relates to a circuit breaker comprising the moving contact limiting structure. According to the moving contact structure and the circuit breaker, the jump pin shaft of the operating mechanism of the circuit breaker can be prevented from being collided and deformed by the moving contact, and reliable and stable work of the operating mechanism of the