As shown in figure "A" of the illustration, what is the purpose of the "test button"? EL-0178

Correct Answer: Option C — The test button is used to mimic an overload to test the trip function of the overload relay.

The test button on a thermal overload relay mechanically deflects the trip mechanism to simulate an overload condition. This verifies the correct mechanical operation of the normally closed trip contacts without requiring actual excessive current draw.