Operating device of opening and closing of circuit breaker

Disclosed in the utility model is an operating device of opening and closing of a circuit breaker. The operating device comprises a manual operating mechanism, an electric operating mechanism and a manual/electric switching mechanism. The manual operating mechanism a gear rack, a connecting support arranged on the gear rack and an operating handle; on end of the gear rack is connected with a connecting rod extended out of a middle cover of the circuit breaker; the connecting support is arranged at one end, approaching the operating rod, of the gear rack and is plugged with an insertion slot arranged at the bottom end of the operating handle to enable the operating handle and the gear rack to be connected; and the gear rack and the connecting support are integrated into one. According to the utility model, the operating device has a reasonable structure; and the connecting support is firm, wherein the function of the connecting support is equal to that of a connector mentioned in the patent documentation CN201332078Y.