Trane SWT1277 Limit Switch serving as the primary defense

serving as the primary defense against heat exchanger failure and overheating

this manual reset spill switch prevents the boiler from cycling under dangerous conditions

This switching relay provides reliable control for blower motors

Technicians often source this 2940-3571 sequencer when troubleshooting elements that remain energized after the thermostat is satisfied or fail to engage during the heating cycle

Trane SWT1277 Limit Switch serving as the primary defenseThe Trane SWT1277 Limit Switch is a critical safety component designed for precise thermal regulation in Trane and American Standard HVAC furnaces. As a high limit automatic reset switch, it monitors the supply air and heat exchanger temperatures to prevent hazardous overheating. This genuine OEM furnace limit switch features a 3 inch insertion length, ensuring accurate sensing deep within the plenum or blower housing. Operating on a normally closed