GM type isolating reversing switch is the load switch of shearer, suitable for AC 50Hz, voltage up to 1140V, current of 250A, 400A, for no-load closing and no-load cutting shearer motor, and can Cut off the power supply of the shearer motor with load in emergency state.Rated working voltage V: 660/1140V Rated working current A: 250/400 Maximum breaking current A: 1500/2400 Dynamic stable current A: 5000/8000 Thermal stable current A: 2000/3200 Rated frequency: 50Hz Measurement content: UIR measurement accuracy : ±5% switch input method: photoelectric isolation Electricity metering: accuracy 6‰ Features: The switch is a device-type molded case switch, with three poles, single breakpoint, manual closing, and manual opening. The up and down movement of the handle becomes left and right rotation, and the closing and opening force distance is not more than 3 kg/m. There are ON, OFF-marks and grounding screw block marks on the end cover of the shell, which can reliably indicate the grounding position of the closing and breaking positions. Conditions of use: 1 The ambient temperature is not higher than +50 degrees Celsius, not lower than -5 degrees Celsius. 2 The ambient air humidity is not greater than 95% and the ambient temperature is +25 degrees Celsius. 3 There is no gas environment that is enough to corrode the metal box and damage the insulator. 4 None Drip and flooded areas