The AC contactor is mainly used in the circuit with AC 50Hz (60Hz), rated insulation voltage up to 690V and rated current up to 95A when the rated working voltage is 400V under the use category of AC-3. It is used for remote connection and breaking of the circuit, and can form an electromagnetic starter with the thermal over relay to protect the possible overload circuit. The contactor is suitable for frequently starting and controlling the AC motor.