Suitable for power plant and substation, petroleum chemical industry department, factories and mines, high building of the low voltage power distribution system of electric power, power distribution and motor control center, capacitance compensation of power conversion, distribution and control. The product has breaking, making capacity is high, the dynamic thermal stability, electrical solutions agile and convenient combination, series of practical, new structure, protection level higher characteristic, can be used as low voltage draw-out switch cabinet of product use.