Lennox 57W76 Rollout Switch 185°F HVAC Safety Limit Switch

The Lennox 57W76 is a rollout safety switch designed for residential and light commercial HVAC furnace applications. This critical safety component monitors flue gas temperature and automatically shuts down the burner if dangerous rollout conditions are detected, preventing potential fire hazards and carbon monoxide exposure.

Key Specifications:

• Temperature Rating: 185°F automatic trip point
• Switch Type: Manual reset rollout limit switch
• Identification: Purple label for easy recognition
• OEM part number for Lennox furnace systems
• Direct replacement for original equipment

Cross-Reference Numbers:

• R37520B018
• AST57W76

This rollout switch is a genuine Lennox replacement part engineered to meet exact OEM specifications for reliable performance and safety. The purple label indicates the 185°F temperature rating for quick identification during service. When the switch trips due to excessive flue temperature, it must be manually reset after the underlying cause is addressed.