A complete electrical equipment automatic control system, in addition to achieving the manufacturing process of mechanical processing, must also have the ability to ensure the long-term safe, stable and problem-free operation of the equipment. Therefore, the protection function is an indispensable part of the entire electrical equipment automatic control system. A complete protection system software must have two or more protection functions such as overcurrent protection and overvoltage protection.

Motor protectorThe AC contactor is a common electrical component in the electrical control system. In the entire electrical control system, they both fulfill their respective responsibilities and cooperate with each other to play a real protective role.

In the system, the AC contactor is used to frequently connect and disconnect the main power circuit and large space control circuit containing the load, while the motor protector is not directly connected to the load. It is mainly used to detect and identify whether the motor and other loads have common faults such as overload, phase failure, three-phase imbalance, etc., and then output data signals to the contactor for protection. If the motor protector is regarded as a referee, then the AC contactor is the judge.

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