Marine Electrical Systems USCG Question #502 (Set 17)

The set point current at which a magnetic-type overload relay tends to trip may be increased by turning the dashpot in the 'lower' direction. What effect will this action have?

Official USCG Answer & Rule Citation

Correct Answer: Option B — reduces magnetic force on the plunger and requires more current to trip the relay

Turning the dashpot in the 'lower' direction increases spring tension or clearance, reducing the magnetic force exerted on the plunger. Under Title 46 CFR and IEEE 45 standards, this requires a higher current value to pull the plunger in and trip the overload relay.

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