Lennox 15M43 MR Rollout Switch SPST 270°F

The Lennox 15M43 MR Rollout Switch SPST is an safety device used in HVAC equipment, particularly furnaces and oil burners, It’s simply an ON/OFF switch where it has an input side and an output side that connect and disconnect depending on the temperature. This rollout switch is to be able to function at high temperatures up to 270°F. In normal operation, the switch is closed. When the furnace or burner gets too hot, the switch will open and stop power to the burner in order to avoid damaging the equipment due to heat.