Red Seal Electrician Practice
Motor controlsQuestion 84 of 1506

Are overload heaters fuses?

  1. No, they do not burn open. They heat up and operate a contact
  2. Yes, they burn open on overload just as a fuse would do
  3. Yes, but only on single-phase motors, not on three-phase motors
  4. No, they only measure the voltage and do not heat up
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Correct answer: No, they do not burn open. They heat up and operate a contact

The trip contact opens, and the contactor coil de-energizes.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 5.2: Contactors

Practice motor controls

Questions last reviewed: 18 October 2026