Motor Contactors

A magnetic switch (consisting of a magnetic contactor and a thermal relay) is the switch that drives the opening and closing of the main (auxiliary) contacts by using magnetic attraction to control the load. As it can rapidly cut the AC circuit and can frequently connect and disconnect the large current control device, it is often used as a load control switch with electric motor, crane, heater and various plant equipment. However, since its magnetic contactor does not have a safety function, a thermal relay must be fitted to provide overload and phase-failure protections.