This series of low voltage withdrawable switchgear is suitable for power plants, substations, petrochemicals, metallurgical rolling steel, transportation energy, light industrial, textiles and other factories and mines, residential quarters, high rise buildings as power conversion, distribution and control of the power distribution equipment of power system with AC 60Hz rated working voltage AC 660V and lower. This unit compiles with GB 7251.1 and GB/T 7251.1.