... Device is for coal mine use. Mining Explosion-proof Permanent Magnetic High-voltage Vacuum Power Distribution DeviceUseThe device is used in ... .Main technical parameters1. Rated Voltage: 10(6)KV2. Rated current:50, 100,150,200,300,400(A)3. Rated frequency: 50Hz4 ... . Allowed operating frequency: 300 times/hr Mining Explosion-proof Permanent Magnetic High-voltage Vacuum Power Distribution Device