How does the amount of overload current affect the thermal cut out?

The correct reasoning for why the higher the overload current causes the thermal cut out to open faster relates to the fundamental principles of thermal protection devices. Thermal cut outs are designed to protect electrical circuits from excessive current, which results in increased heat generation. The core function of a thermal cut out is to monitor the temperature of its sensing element.

When an overload current flows through the device, it generates more heat than normal. The greater the current, the quicker the temperature climbs to the threshold that activates the cut out mechanism. Essentially, a higher overload current accelerates the heating process, leading to a rapid triggering of the protection mechanism, which disconnects the circuit to prevent damage.

In contrast, if the overload current is lower, it generates less heat, causing the thermal cut out to take a longer time to respond, which could leave the circuit at risk for a longer duration. This relationship between the magnitude of the current and the thermal response time is critical in ensuring the safety and longevity of electrical systems.