Carrier HH18HC350 Rollout Switch SPDT 350°F

The Carrier HH18HC350 is a Rollout Switch, a crucial safety component specifically for Carrier furnaces. This little switch is a real heavy hitter in the fight to keep the furnace from getting too hot. Within the switch is a spring that is loaded and a coil that is temperature-sensitive. When the temperature of the furnace rises beyond a safety level of 350 degrees F, the coil changes its shape and triggers the switch. This cuts the supply of power to the burner, which in turn turns off the furnace and avoids further harm from excessive heat. It also saves the Carrier furnace and the home from safety hazards since it automatically shuts down the burner during high temperatures.