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How thermal overload relays work
Sep 04, 2018

When it is plugged into the main circuit, it flows in the same current as the motor, When the motive overload reaches a certain degree, the heat element is heated to a certain degree of bending, and the action structure of the thermal relay is promoted. The action time of the thermal relay and the magnitude of the overload current change according to the inverse time-limit relationship (and as the motor overload protection thermal relay, must ensure that the normal start and operation of the motor is not affected, and can maximize the load carrying capacity of the motor,

Therefore, the action characteristic curve of the thermal relay should be located below the allowable heating characteristic curve of the motor and close to it.

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