If a thermal protector switch activates to prevent overheating damage to an electric motor, once the motor has cooled;

• A. The circuit can be reset from the flight deck.
• B. The motor will reset by itself.
• C. The circuit protector is replaced by a maintenance crew.
• D. The circuit must be replaced.

Answer: (B)

When a motor overheats, a thermal protector opens the circuit to stop current flow and protect the winding. For a self-resetting protector, once the motor cools down below the reset temperature, the device automatically closes the circuit again and normal operation can resume if power is available. That automatic reset is why the best answer is that the motor will reset by itself after cooling. Resetting from another control interface isn’t required, and replacing the protector or the circuit isn’t necessary unless the protector has failed or there’s another underlying problem. If trips happen repeatedly, you’d want to check for overloading, inadequate cooling, or wiring faults to prevent re-tripping.