JV1 series indoor high voltage vacuum circuit breaker is three-phase AC 50Hz. Indoor switchgear with rated voltage of 12kV and 24kV can be used for control and protection of industrial and mining enterprises, power plants, substations, and electrical facilities, and is suitable for places with frequent operations. The VET operating mechanism is integrated with the main body of the clipper. It can be designed as a fixed installation unit, or can be equipped with a special propulsion mechanism to form a handcart unit. The main circuit part can use the integral solid-sealed pole to realize the miniaturization, high reliability and maintenance-free of the circuit breaker. It can be equipped with KYN28A-12 (GZS) and other mid-mounted handcart-type switch cabinets, and the fixed type can also be used with XGN Series fixed switchgear.