Discussion
The overload release of a dc starter operates by
Answer: D
Correct answer: short-circuiting the no-volt coil when the current is excessive
The overload coil is an electromagnet carrying the load current; on overload it pulls up an armature that short-circuits the no-volt coil. Deprived of its current, the no-volt coil releases the starter arm, which springs back to the off position and disconnects the motor while reinserting the full starting resistance. The two coils thus work together, one sensing loss of supply and the other excessive current.
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