What is a characteristic of a thermal overload switch?

A thermal overload switch is designed to protect electrical circuits from overheating. This protection mechanism relies on a bimetallic strip, which is made up of two different metals bonded together. When the temperature rises, the metals expand at different rates, causing the strip to bend. As the temperature continues to increase, the bending of the bimetallic strip eventually reaches a threshold that causes the switch to trip open, interrupting the circuit and preventing damage due to excessive current or heat.

This operation based on the thermal response is critical because it provides a simple and effective way to safeguard electrical systems in various applications. By tripping open when heated, the thermal overload switch helps prevent overheating of components, which could otherwise lead to equipment failure or fire hazards. The mechanism of bending due to heat is fundamental to its design and function, making it a reliable protection feature in electrical systems.