York S1-025-43289-000 Auto Limit Switch L255F-30

The York S1-025-43289-000 Auto Limit Switch L255°F-30°F is a temperature-controlled secure regulator designed to measure heat transfer and plenum temperature in HVAC systems. When temperatures rise above the upper limit, it closes electrical contacts, when temperatures fall below the lower threshold, it remains constant. The switch is fitted into the furnace or air handler housing and connected to the control circuit to switch off when overheating takes place. The auto limit switch supports proper fan sequencing, avoids high heat accumulation, and ensures secure heating operations in HVAC systems.