What is a ac contactor?

– AC contactor is a kind of automatic control apparatus. Contactor is used in frequent switching on or off an AC circuit, also can cut off the fault current, has control of large capacity, long-distance operation, combined with relay can realize the operation timing, interlock control, a variety of quantitative control and pressure loss and undervoltage protection, widely used in automatic control circuit, the main control object is a motor, and can also be used for other electric power load control.
More than 20 amps contactor with arc shield, the electromagnetic force produced by disconnecting the circuit, fast breaking arc, to protect the contact.
– AC contactor mainly consists of four parts: (1) the electromagnetic system, including attraction coil, a movable iron core and the static iron core; (2) contact system, including three group of main contact and one to two groups of normally open and normally closed auxiliary contacts, it and the moving core is connected together mutually linked; (3) arc extinguishing device, generally larger capacity of AC contactor are equipped with arc extinguishing device to quickly cut off the arc, from the main contact of the burnt out; (4) insulation casing and accessories, all kinds of springs, transmission mechanism, a short circuit ring and a wiring column.