Carrier HH680310 Limit Switch L190°F–40°F

The Carrier HH680310 Limit Switch 190°F-40°F is a safety control to keep the heating and air conditioning system from overheating or freezing. It's like an automatic on-off switch based on temperature. The switch is plastic and when temperature changes a lever is triggered. In this particular case, we have the system turn off at 190°F and turn back on at 150°F for this particular limit switch. All carrier HVAC equipment furnaces and air conditioners have these limit switches. Temperature is automatically limited by limit switches that also help protect the HVAC system from damage as it runs efficiently.