122-423

This high-limit control switch is an essential safety component for residential and commercial HVAC systems, specifically designed for use in furnaces and air handlers. As a thermal safety device, this fan disc switch monitors the internal heat levels of your heating equipment. It is engineered to automatically open the electrical circuit if the temperature exceeds the safe operating threshold of 159°F, preventing potential damage or hazardous conditions caused by overheating. Once the temperature drops by the 35°F differential, the switch resets to restore normal operation. Replacing a faulty limit switch is critical for maintaining the safety, efficiency, and longevity of your heating system. This durable, surface-mount disc switch provides reliable thermal protection and is a standard replacement part for many forced-air heating applications.
Type: Fan Disc High Limit Control Switch
Size: Small
Application: Used as a safety cutout in gas furnaces, electric heaters, and HVAC air handling units to prevent overheating.
Specifications: Temperature Rating: Opens at 159°F; Reset Differential: 35°F (Closes at 124°F); Configuration: Normally Closed (NC); Style: Standard 3/4-inch fan disc.