The ZN63(VS1)-12 series high-voltage vacuum circuit breaker is a three-phase AC 50Hz, indoor switching device with a rated voltage of 12kV. It is suitable for control and protection in industrial and mining enterprises, power plants, substations, and electrical facilities, and is well-suited for frequent operation scenarios. It adopts a VET operating mechanism integrated with the circuit breaker body, designed to be used either as a fixed installation unit or paired with a dedicated propulsion mechanism to form a trolley unit. The main circuit part can utilize an overall solid-sealed pole column to achieve miniaturization, high reliability, and maintenance-free operation. It can be matched with KYN28A-12(GZS) and other center-mounted trolley-type switchgear, as well as XGN fixed switchgear.