The current at which a magnetic-type overload relay tends to trip may be decreased by raising the plunger further into the magnetic circuit of the relay. What effect does this action have?

Correct Answer: Option C — increases magnetic pull on the plunger and requires less current to trip the relay

Raising the plunger further into the magnetic circuit reduces the air gap, increasing the magnetic pull force on the plunger. Consequently, less coil current is required to overcome spring tension and trip the relay.