Supco SHL514 Plenum Limit Switch L180-40F

The Supco SHL514 Plenum Limit Switch is an electrical temperature-activated control component used to ensure safe operation within air handling equipment. It is designed to open the electrical circuit at 180F and close it at 140F, supporting managed airflow conditions in furnace plenums or duct-mounted applications. The switch is installed in heating systems where monitoring discharge air temperature is necessary to protect components and maintain operational limits. It operates as part of the system's safe control circuit, interrupting or restoring power based on temperature thresholds to support stable performance in residential HVAC systems.