Circuit breaker operating mechanism with controllable opening distance function

The utility model provides a circuit breaker operating mechanism with a controllable opening distance function. The circuit breaker operating mechanism comprises a link mechanism, a crank arm changeover mechanism, a switch-on-off power system and a moving contact component, wherein the switch-on-off power system, the crank arm changeover mechanism and the moving contact component are connected sequentially; the link mechanism comprises a rod body, a big connection head and a small connection head; the big connection head is connected with the switch-on-off power system, the small connection head is connected with the crank arm changeover mechanism, and the two ends of the rod body are respectively connected with the big connection head and the small connection head in an adjustable manner. According to the circuit breaker operating mechanism with the controllable opening distance function, the connection structure is improved to a separated type structure, the big connection head and the small connection head can be adjusted on the rod body to change the distance between the big connection head and the small connection head, so as to realize the purpose of opening distance controlling, and to guarantee the service life and the high reliability of the circuit breaker.