Red Seal Electrician Practice
Motor controlsQuestion 91 of 1506

Which contact is known as a normally closed, off-delay type?

  1. Normally closed, timed-open (NCTO)
  2. Normally open, timed-closed (NOTC)
  3. Normally open, timed-open (NOTO)
  4. Normally closed, timed-closed (NCTC)
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Correct answer: Normally closed, timed-closed (NCTC)

It opens at once when the coil is energized, and closes after the coil has been off for the set time.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 5.3: Time-delay Relays

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Questions last reviewed: 18 October 2026