Thermistors

Thermistors are small thermal devices that are used together with an electromagnetic overload relay. The thermistors are inserted into the three windings of the motor.

 

Any increase in the current will cause heating in the windings, which is detected by the thermistors that send signals to the amplifier.

 

The amplifier is connected to the electromagnetic relay. As soon as a signal is received from the thermistor about overheating, this amplifier increases the current value in the coil of an electromagnetic relay which activates the trip, and the motor stops or trips.

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