Carrier HH18HA440 Auto Limit Switch 100°F-140°F

The Carrier HH18HA440 is an automatic limit switch used for Carrier HVAC systems probably furnaces or air handlers. This small switch is approximately 1.125 inches long, 0.75 inches wide and high. This has a set temperature range, which is normally between 100°F and 140°F. If the temperature inside the HVAC unit rises to the maximum level 140°F for instance, the switch will turn off the power to avoid any danger of overheating the system. If the temperature goes below the lower limit 100°F, depending on the system design the cut-off switch may also stop the power supply.