Medium voltage contactor (vacuum contactor) is suitable for power network AC 50Hz, the main circuit rated voltage 1140V, rated current up to 630A, for making, breaking, frequently starting, and controlling AC motor, also for forming magnetic starter with a variety of protection devices (JDB electronic integrated protector, JR9 type over current protection device, resistance capacitance absorber), especially for mining application. The contactor conforms to IEC 60947-4-1, GB/T 14048.4 and JB/T7122 standard, the main performance indicators have reached the international level.