Supco SHL508 Plenum Limit Switch L190-20F

The Supco SHL508 Plenum Limit Switch L190-20F is a temperature control component used to monitor heat conditions within plenum areas and regulate HVAC system operation. The assembly features a fixed temperature setting that assists in interrupting electrical flow when excessive heat is detected and resetting as conditions return to normal. It is installed in heating and air handling systems, where it provides thermal protection for furnaces, air handlers and related equipment. This control supports safe airflow management by responding to temperature changes inside the plenum section of units. Its operation enables it to maintain proper system performance.