What type of switch is the limit switch on an electric furnace?

The limit switch on an electric furnace is primarily designed to monitor the temperature within the furnace and prevent overheating. When the temperature exceeds a predetermined limit, the limit switch interrupts the power to the heating elements, ensuring the safety and operation of the furnace.

An automatic reset switch is specifically designed to restore power automatically once the temperature drops back to a safe level. This functionality is crucial in maintaining the furnace's operating efficiency and safety without the need for manual intervention. By automatically resetting, it allows the system to return to operation quickly while still providing a safeguard against potential overheating issues.

In contrast, a manual reset switch would require an operator to physically reset the switch after it has tripped, which can be less convenient and effective in ensuring continuous operation. The breaker switch serves a different function, protecting against electrical overloads rather than monitoring and managing temperature. Lastly, a thermostatic switch specifically regulates heating according to room temperature, rather than serving as a safety mechanism in the heating element's operation. Thus, the automatic reset characteristic of the limit switch helps maintain safety and efficiency in electric furnace operations.