1) Model: KBZ-630/1140(660), BKD9-400/1140(660), BKD-350/1140(660)
2) It can be used in coal mines full of explosive gas mixture (methane and coal dust) to start the big capacity motor infrequently in the three-phase of AC power-supply of 50Hz, rated voltage 660V or 1,140V, rated current is less than 630A as the feeder switch, distribution switch and sub-switch for movable transformer station
3) The inner is equipped with a vacuum contactor. It has an integrated protector with the functions of overload, short circuit, fault-phase and leakage
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