In electrical engineering, because the AC and DC main circuits and contactors can be quickly switched off and the devices with high current control (some types up to 800 amps) can be switched on frequently, they are often used as motors for control. It can also be used to control electrical loads such as factory equipment, electric heaters, working machines and various power units. The contactor not only can switch on and off the circuit, but also has low voltage release protection. The contactor has a large control capacity and is suitable for frequent operation and remote control. It is one of the important components in the automatic control system.
In industrial electrical, there are many types of contactors, and the current varies from 5A to 1000A, and its use is quite extensive.
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