Carrier HH18HA449 SPST Manual Reset Rollout Switch 350°F

The Carrier HH18HA449 Manual Reset Rollout Switch is a thermal safety control part of the HVAC systems, which closes its one-pole single-throw contact at 350°C to interrupt the flow of electricity to prevent heat-related damage. It operates on a temperature-sensitive system, which is set to go off at a predetermined temperature and needs to be reset by hand when it goes off, so that it can take corrective measures before it comes back on. The switch is placed in the control circuit, where it is likely to become overheated, and is a part of the electrical network of the system.