GM 250/300/400A 660/1440V Special Explosion-Proof Isolation Reverse Switch for Coal Mine

Product Description

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.


Model Description



Technical parameters and structure dimensions

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‰



Product features and operating environment

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

Product details

Product real shot

A corner of the production workshop

Product packaging

Product application case

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