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Over-load coil performs the function when __________

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Over-load coil performs the function when __________

(a) In the case of failure of field current

(b) If the resistance is very high

(c) If armature current increases beyond certain value

(d) At the start of each rotation

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Right choice is (c) If armature current increases beyond certain value

The best explanation: The contact of this relay at armature current above a certain value (over load/ short circuit) closes the NVC ends, again bringing the handle to OFF position. NVC and OL release are protections incorporated in 3-point starter.

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