Reznor 57953 Limit Switch Enhanced Durability: Zinc plated steel

Enhanced Durability: Zinc plated steel construction prevents oxidation and mechanical wear in rigorous HVAC environments

Can I swap a 230F manual reset with an auto-reset switch

meeting the NFPA 72 requirement for sampling tubes to extend across at least 2/3 of the duct width for reliable smoke detection

Built with reinforced thermoplastic

Key Benefits for Technicians Precise Pressure Control: Enables a stable 5-12" WC pressure range for varied gas regulator settings

Reznor 57953 Limit Switch Enhanced Durability: Zinc plated steelEnsure your commercial heating units operate within safe thermal parameters with the Reznor 57953 Limit Switch. This L170 40F limit control is a precision engineered OEM replacement part designed to monitor discharge air temperatures and prevent heat exchanger damage. In the field, reliability is paramount; this switch features a fixed 170F trip point and a 130F reset differential (40F drop), making it a critical safety component for Reznor gas fired