Supco SHL512 Plenum Limit Switch L170-20F

The Supco SHL512 Plenum Limit Switch is a temperature-actuated control component used in commercial systems. It opens at 170F and closes at 150F to monitor and regulate air temperature within furnace plenums and air handling ducts. The switch responds to excessive heat by interrupting or restoring circuit continuity, supports to manage fan and burner operation in residential HVAC systems equipment. It is installed in plenum sections where airflow temperature must be controlled. The component works as a safe and operational control element within heating and cooling assemblies during temperature fluctuations in systems.