543-014

The 3-inch High Limit Switch (L125-30F) is a vital safety component designed for residential heating systems, including gas furnaces, electric furnaces, and air handlers. This thermal limit control switch acts as a failsafe by monitoring the internal temperature of your HVAC unit to prevent hazardous overheating. When the temperature reaches the factory-preset limit of 125°F, the switch automatically opens the electrical circuit to shut down the heat source. Once the unit cools down by the 30°F differential (resetting at 95°F), the switch closes to allow normal operation. If your heating system is short cycling or the blower motor is running constantly without heat, a faulty high limit sensor may be the cause. This high-quality replacement part ensures your equipment operates within safe parameters, protecting your heat exchanger and home from damage.
Type: High Limit Control Switch
Size: 3-inch
Dimensions: 3 in
Application: Commonly used in forced-air furnaces and HVAC air handling units to monitor plenum temperatures and provide overheat protection.
Specifications: Opening Temperature: 125°F; Closing Temperature: 95°F; Temperature Differential: 30°F; Automatic Reset function.