It serves as a universal HVAC relay

It is designed to automatically re-engage the circuit once the internal temperature falls roughly 20°F below the trip point

Precision Thermal Calibration: Engineered for a 170-degree trip point to safeguard against over-temperature conditions in high-efficiency heat exchangers

and cotter pin for a professional-grade repair

a cracked or clouded sight glass shield isn't just a maintenance oversight

Lennox 56M13 Control Limit It serves as a universalThe Lennox 56M13 Control Limit is a critical high temperature safety component engineered for precision in gas furnace and HVAC system applications. This SPST (Single Pole Single Throw) switch provides indispensable protection by monitoring heat exchangers and duct temperatures, ensuring reliable safety shutoff during overheating events. This specific Lennox limit switch is often identified as 56M1301, confirming precise OEM replacement compatibility