Red Seal Electrician Practice
Motor controlsQuestion 13 of 1506

In a start-stop motor control circuit, how is the seal-in contact connected?

  1. A normally closed auxiliary contact of the contactor, in series with the start button
  2. A normally open contact of the overload, in series with the stop button
  3. An NO auxiliary contact of the contactor, across the start button
  4. A normally closed contact of the contactor, in parallel with the stop button
Show answer

Correct answer: An NO auxiliary contact of the contactor, across the start button

After the contactor pulls in, its closed auxiliary contact keeps the coil powered when the start button is released.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 6.4: Motor Control Circuits

Practice motor controls

Questions last reviewed: 18 October 2026