What does the term "thermal overload protector" refer to?

The term "thermal overload protector" refers specifically to a device that disconnects power to the motor when it overheats. This is a critical safety feature in motors, designed to prevent damage that can occur due to excessive heat, which may be caused by overloading or an operational fault.

When the motor operates beyond its rated capacity, its temperature rises. The thermal overload protector detects this increase in temperature and interrupts the power supply to prevent overheating, which can lead to insulation failure or even catastrophic failure of the motor. This protective mechanism ensures the longevity and reliable operation of the motor by safeguarding it against potential thermal damage.

The other options refer to different aspects of motor operation or maintenance that do not capture the protective function of the thermal overload protector. For instance, a sensor for measuring efficiency does not address overheating directly, an indicator of operational status monitors performance but does not provide protective measures, and a tool for repairing motor components relates to physical maintenance rather than thermal protection measures.