543-028

This 3-inch high limit switch is a vital safety component designed for modern HVAC systems and forced-air furnaces. Engineered to prevent equipment overheating, the L150-30F thermal control monitors the internal plenum temperature of your heating unit. When the temperature exceeds the safe operating threshold of 150°F, the switch automatically opens to break the electrical circuit, protecting the heat exchanger and surrounding components from thermal damage. Once the system cools down by 30°F, the switch resets to restore normal functionality. This replacement sensor is essential for maintaining furnace reliability, ensuring home safety, and optimizing the performance of your residential or commercial heating system.
Type: High Limit Control Switch
Size: 3-inch probe length
Dimensions: 3 inches
Application: Used as a safety cutout in residential furnaces, air handlers, and various HVAC heating applications to prevent system overheating.
Specifications: Open Temperature: 150°F; Close Temperature: 120°F; Temperature Differential: 30°F; Automatic reset; SPST (Single Pole Single Throw) configuration.