543-280

Ensure the safety and efficiency of your heating system with this professional-grade 3-inch high limit switch. This essential HVAC safety component is designed to monitor the temperature within a furnace heat exchanger, providing critical protection against overheating. If the internal temperature reaches the maximum safety threshold, the switch automatically interrupts the heating circuit to prevent equipment damage and ensure safe home operation. Once the temperature cools by the specified differential, the switch resets, allowing for normal furnace function. This thermal limit control is a standard requirement for maintaining a reliable forced-air heating system and is a common replacement part for furnaces that are short-cycling or failing to stay lit due to thermal overload.
Type: High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 in
Application: Used in residential forced-air furnaces, gas heaters, and electric heating systems to monitor plenum temperatures and prevent thermal overloads.
Specifications: Cutout Temperature: 280°F; Reset Differential: 40°F; Reset Temperature: 240°F; Switch Logic: Normally Closed (Opens on Temperature Rise); Reset Type: Automatic.