What is a typical component that acts as a high-temperature safety cutoff?

A bimetal disc is a typical component used as a high-temperature safety cutoff due to its reliable mechanical properties that change with temperature. Bimetal discs consist of two different metals bonded together that expand at different rates when heated. When the temperature reaches a predetermined level, the disc bends, triggering a switch that cuts off the power to the heating element or equipment. This action helps to prevent overheating, ensuring safe operation of HVAC systems.

In contrast, a capacitor stores electrical energy and is not involved in thermal monitoring or safety cutoffs. A relay is an electrical device that controls power to circuits but does not directly respond to temperature changes. A thermocouple measures temperature through the voltage generated at its junctions but does not act as a cutoff mechanism in itself. The unique response of the bimetal disc to temperature variations makes it a crucial safety feature in heating applications.