543-181

Ensure the safety and efficiency of your heating system with this 3-inch high limit switch. Designed as a critical thermal safety control, this component monitors the temperature within your furnace or HVAC unit to prevent overheating. The L180-40F switch acts as a vital failsafe, automatically opening the electrical circuit to shut down the heating cycle if the internal air temperature reaches a limit of 180 degrees Fahrenheit. Once the system cools down by 40 degrees to a safe reset temperature of 140 degrees Fahrenheit, the switch closes to allow normal operation to resume. This reliable replacement limit control is essential for protecting the heat exchanger and ensuring the longevity of residential and commercial forced-air systems.
Type: High Limit Control Switch
Size: 3-inch probe depth
Dimensions: 3 inches
Application: Primary safety control for gas furnaces, electric heaters, and HVAC air handlers to monitor plenum temperature and prevent equipment damage.
Specifications: Open Temperature: 180°F; Close/Reset Temperature: 140°F; Temperature Differential: 40°F; Configuration: Normally Closed (NC)