Which component provides overload protection by tripping when current is too high?

• A. Pushbutton for manual start.
• B. Varistor across coil.
• C. Thermal overload protector that trips when motor current is too high.
• D. Capacitor bank.

Answer: (C)

Overload protection for a motor is provided by a thermal overload protector. When the motor draws current beyond safe levels—often due to overload or a stall—the protector senses the excess heat (typically via a bimetal element) and trips, interrupting power to the motor to prevent winding damage. This protection is specifically about safeguarding the motor from overheating caused by overcurrent.

The other components have different roles: a pushbutton for manual start simply initiates operation and does not protect against overload; a varistor across the coil clamps voltage surges but doesn’t limit or detect excessive current; and a capacitor bank is used for starting or running characteristics and power factor—not for protecting the motor from overcurrent.