543-040

This 3-inch High Limit Switch L230-30F is a vital safety component designed for residential and commercial heating systems. Functioning as a thermal cutout, this switch monitors the internal temperature of your furnace or air handler to prevent dangerous overheating. If the heat exchanger reaches the critical threshold of 230°F, the switch automatically opens to break the electrical circuit and shut down the burners, protecting your HVAC equipment from damage. Once the unit cools by 30°F, the switch resets to allow for normal operation. This replacement limit control is an essential part for maintaining the safety and performance of forced-air gas furnaces. If your heating system is short-cycling or failing to stay lit, a faulty safety sensor may be the cause, and this reliable L230-30F switch ensures your system stays within safe thermal parameters.
Type: Furnace High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 in
Application: Used as a safety limit control in gas furnaces and forced-air heating systems to monitor heat exchanger temperatures.
Specifications: Temperature Limit: Opens at 230°F; Differential: 30°F (Closes at 200°F); Automatic reset; Single-pole, single-throw (SPST) configuration.