Why should the thermal relay be used with the AC contactor
triggering the normally closed contact of the thermal relay to disconnect the AC contactor coil circuit, and the AC contactor After the coil is lost, the main contact is reset and the motor is stopped
If the fault occurs at this time, the motor is overloaded, then an excessively large current is applied to the thermal element of the thermal relay FR
When the push button SB2 is pressed, the AC contactor coil KM is energized and its main contact is closed, so that the motor is started and the auxiliary contact is closed from the self-locking action.
Thermal relay is used to protect the motor so that it is not overloaded, and motor-related, so with the use of the.
