Carrier HH18HA465 Auto Limit Switch 100°F-165°F

The Carrier HH18HA465 is an automatic limit switch designed for Carrier HVAC equipment, typically furnaces or air handlers. A tiny but critical safety device that regulates temperature within your system. This miniature switch, measuring only 1.1" long, 0.9" wide, and 0.8" high, weighs an incredibly light 0.02 lbs. Despite its size, it plays a big role in preventing overheating. The HH18HA465 is pre-set for a specific temperature range, typically between 100°F (37.8°C) and 165°F (73.9°C). It contains a relay, either sequencing or switching, that controls the flow of power based on temperature. If the temperature within the unit exceeds the set limit (usually 165°F), the switch automatically opens the relay and cuts off power to the heating element. This safeguards your furnace from potential overheating and damage.