Carrier HH18HA596 Limit Switch

The Carrier HH18HA596 Limit Switch is a safety control component used to monitor temperature conditions within heating equipment. Installed inside furnaces, air handlers or packaged units and it detects excessive heat levels and communicates with the control circuit to manage operational shutdown when required in HVAC systems. This switch is typically positioned near heat-producing sections of the appliance, where it responds to abnormal temperature rise during operation. As part of the safety control network, it works in coordination with ignition systems, blowers, and control boards to regulate activity within defined thermal limits across equipment.