NATE Electrical Practice Exam 2026 – Complete Preparation Resource

The purpose of the holding circuit in a magnetic motor starter is to maintain the main contacts in a closed position after they have initially been energized. Upon activation of the starter, the main contacts close and allow current to flow to the motor. The holding circuit, which is usually connected in parallel with the start button, provides a continuous path for current that keeps the main contacts closed even after the start button is released.

This arrangement ensures that the motor continues to run without needing to keep the start button pressed, allowing for a more practical operation of motor systems. If the control circuit through the interlock is broken (for example, if an emergency stop is activated), the holding circuit also stops delivering current, which opens the main contacts and de-energizes the motor, ensuring safety. The correct answer reflects this fundamental operation of the holding circuit in a magnetic motor starter.