In motor circuits, which protection elements are essential in addition to the appropriate OCPD?

• A. A GFCI on every motor branch.
• B. Only a temperature sensor.
• C. Motor overload protection and proper control devices.
• D. A visual indicator light.

Answer: (C)

Motor circuits require more than just overcurrent protection to guard a motor against damage. In addition to the appropriate OCPD, you need motor overload protection and proper control devices. The overload protection, usually a thermal overload relay, monitors the motor’s temperature and will trip if the windings overheat or stall, preventing insulation damage and reduced motor life. Pairing this with proper control devices—such as a motor starter with integrated overload protection, along with correct start/stop controls and interlocks—ensures safe operation, correct sequencing, and reliable shutdown during faults.

GFCI protection on every motor branch isn’t a blanket requirement for protection of motor windings; ground-fault protection serves a different purpose and isn’t a substitute for overload protection. A temperature sensor alone cannot disconnect the motor, and a visual indicator light does not provide protection.