The Supco L180-40 Limit Switch is a reliable bimetal-disc temperature control designed for fan and limit applications in HVAC systems, particularly furnaces and other heating equipment. It operates by sensing temperature changes and automatically opening the electrical circuit when the temperature rises to 180°F, then closing again at 140°F after cooling. This automatic-reset, SPST sw... https://www.partshnc.com/l180-40-supco-l180-40f-limit-switch