The ZW8-12 outdoor high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) is a three-phase AC 50Hz device, suitable for outdoor high-voltage switchgear with a rated voltage of 7.2~12kV. The circuit breaker complies with the national standard GB1984 "High-Voltage AC Circuit Breakers," the professional standard JB3855 "3.6~40.5kV Outdoor AC High-Voltage Vacuum Circuit Breakers," and relevant IEC standards. It can be used for the control and protection of electrical equipment in industrial and mining enterprises, power plants, and substations, and is suitable for locations with frequent operation. The circuit breaker has the capability for multiple interruptions and rapid reclosing.