How does thermal overload protection function in motors?

Thermal overload protection is a safety feature designed to prevent motors from overheating, which can lead to damage and failure. It primarily functions by detecting excess heat generated within the motor due to prolonged operation or overload conditions. When the internal temperature rises beyond a predetermined threshold, this protection mechanism activates and interrupts the electrical circuit supplying power to the motor. This interruption effectively reduces the risk of damage caused by overheating, safeguarding both the motor and its connected systems.

While there are other methods of motor protection, such as monitoring current for overload conditions or increasing airflow around the motor, the core principle of thermal overload protection specifically focuses on temperature detection. By responding to heat rather than just electrical parameters, this system ensures that motors do not run at unsafe temperatures, which is critical for their longevity and reliability.