An overload relay protects a motor and its related circuits from overloads.

• A. It cannot protect
• B. False
• C. Only during startup
• D. True

Answer: (D)

Overload protection relies on sensing when a motor is drawing too much current and then disconnecting power to prevent overheating. An overload relay sits in series with the motor circuit and uses a heat-sensitive element (or equivalent sensor) that detects excessive current. If the overload persists beyond the relay’s set time, it trips and opens the circuit, protecting the motor windings and insulation as well as the related supply wiring. This protection is active during running, not just at startup, though the device is designed to tolerate normal startup inrush thanks to its time-delay characteristics. So the statement is true.