The product is suitable for underground coal mines with explosive dangerous gas, in the power supply system with rated voltage of 10kV or 6kV, rated frequency of 50Hz, and three-phase AC neutral point is not directly grounded, as high-voltage power distribution, high-voltage starter and other high-voltage electrical equipment. , used for its secondary control power supply and metering signal, and its explosion-proof performance and electrical performance meet the requirements of national standards and industry standards.