York S1-025-35355-000 SPST Limit Switch 45°F-55°F

The York S1-025-35355-000 SPST Limit Switch 45°F-55°F is an essential part used in HVAC system to switch electrical circuits depending on changes in temperature within a particular range. This limit switch is designed to work based on thermal expansion and contraction of the material. It has an element whose length changes with temperature, usually a bimetallic strip that either bends or flexes. When the temperature goes up to the upper limit of the range 55°F in this case, the bimetallic strip bends enough to trigger the switch mechanism and open or close the electrical circuit as required. On other hand when the temperature reduces below the lower limit, the bimetallic strip repositions itself and turns off the switch.