543-021

The 3" High Limit Switch L150-30F is a vital safety control component used in residential and commercial heating systems. Designed to monitor internal temperatures, this thermal limit switch acts as a failsafe by automatically interrupting the electrical circuit if the furnace or air handler exceeds its safe operating limit of 150°F. This prevents overheating, protects the heat exchanger, and ensures the overall safety of your HVAC system. Once the internal temperature cools down by a 30°F differential, the switch automatically resets to restore normal operation. Ideal for repair and maintenance of forced-air furnaces, this high-quality replacement switch ensures reliable performance, consistent temperature regulation, and longevity for your heating equipment.
Type: High Limit Control Switch
Size: 3-inch profile
Dimensions: 3 inches
Application: Used in forced-air furnaces, gas heating units, and HVAC air handlers to provide over-temperature protection and system safety.
Specifications: Opening Temperature: 150°F; Reset Differential: 30°F (Closes at 120°F); Reset Type: Automatic; Contact Configuration: Normally Closed (NC).