Variable Frequency Drive, Soft Starter, Voltage Regulator manufacturer / supplier in China, offering Manufacturer 380V 37kw 74A Built in Bypass Soft Starter for Water Pump Air Compressor, Top Factory Built-in Bypass Soft Start 250kw 380V for Water Pump, Manufacturer 110kw 220A 3 Phase Built-in Bypass AC Motor Soft Starter and so on.