JK-12DG/1250-20 Three-position In-Cabinet Installation (hereinafter referred to as the "circuit breaker") is suitable for AC 50Hz, 35kV power systems and can be used by industrial and mining enterprises, power plants, and substation as protection and control equipment, and is also suitable for frequently operated environments. This product meets the requirements of the standards such as ***GB1984 "AC High-Voltage Circuit Breaker" and JB3855 "3.6-40.5kV Indoor AC High-Voltage Vacuum Circuit Breaker".