White-Rodgers 3L09-4 Limit Switch or threaded into position—making it

or threaded into position—making it compatible with virtually all pilot burners found in furnaces

Professional Construction: Built with high-quality materials to resist oxidation and withstand temperatures from 780°F to 1400°F

Key Benefits: Ensures combustion safety by detecting flames exiting the heat exchanger transition

allowing for direct hardwired connection to your controller's analog input without requiring additional conduit in many jurisdictions

For shorter runs

White-Rodgers 3L09-4 Limit Switch or threaded into position—making itThe White Rodgers 3L09 4 Limit Switch is a 1 2 inch bimetal disc control engineered for critical thermal protection in residential furnaces and air handling units. Designed for high speed contact separation, this SPST board mount limit switch functions on a fixed thermal profile, featuring a 150 degree F open temperature and a 130 degree F close temperature. With a 3. 12 inch insertion length, this plenum high limit control ensures the sensing element