Using the operating mechanism and circuit breaker body integration, the design can be used as a fixed installation unit, and can also be equipped with a special propulsion mechanism to form a handcart unit. The main circuit part can be used as a whole solid seal pole to achieve circuit breaker miniaturization, high reliability, maintenance-free, can be equipped with KYN28A 12(GZS) and other central hand-mounted switchgear, fixed type can also be used for XGN series fixed switchgear.