Lennox 57W37 Auto Limit Switch 3" Insert 140-170°F

The Lennox 57W37 Auto Limit Switch is a safety device used in air handling units, furnaces and heat pumps among other HVAC equipment. When its temperature range is reached through preset the electrical circuit as an automatic thermostat. For the 57W37, it turns off the system when the temperature rises between 140°F and 170°F, to prevent overheating and possible damage to equipment. This automatic shutoff the system cools down and restarts again if the temperature is lower than the designated limit, to obtain safe and efficient operation. In general, the Lennox 57W37 Auto Limit Switch protects your HVAC equipment from overheating and keeping your temperature stable.