1. Function
This mine explosion-proof type vacuum feeder switch is mainly used as main switch or
branch switch in AC 50Hz power distribution system of indirect neutral-point earthing with
voltage of 1140V or 660V and current of 400A or 200A in underground coal mines with
explosive and dangerous gas(methane) and coal dust and it is also used for non-frequent
start of big capacity motor .

2. Model


3. Characteristics
3.1 Protection for short circuit,overload,electric leakage and leakage lockout
3.2 Setting of multiples of overload and short circuit is available
3.3 Selective leakage adopts appending DC power supply principle
3.4 The operating mechanism adopts manual switching on or off , and it adopts electromagnetic tripping in fault state.
4. T echnical Parameter
4.1 Rated voltage(V): 1140, 660
4.2 Rated current(A): 400, 200
4.3 Short -circuit protective action time(ms): ≤100
4.4 Single-phase 1kΩ resistance earthing, action protective time(ms): ≤30