Rheem-Ruud 44-20037-03 Fuse Link

The Rheem-Ruud 44-20037-03 Fuse Link is a critical thermal safety component designed for HVAC high-limit protection in gas-fired furnaces and air handlers. Engineered with a definitive 333°F trip point, this thermal cutoff switch provides essential circuit interruption to prevent heat exchanger damage or hazardous conditions during a rollout or over-temperature event. This specific model serves as the direct replacement for B697 fuse links, ensuring field compatibility for technicians servicing older units. While functionally identical to the B697, the 44-20037-03 is supplied as a single unit or within specific Cam Stat configurations. Professional installation is required to maintain the circuit integrity of the furnace limit control system. Integrating this OEM Rheem replacement part ensures the diagnostic board receives accurate continuity signals, preventing nuisance trips while maintaining strict adherence to combustion safety protocols in residential and light commercial applications.

• Precise Thermal Calibration: Calibrated to 333°F (167°C) for accurate furnace safety circuit integration.
• OEM Compatibility: Replaces Rheem-Ruud 44-20037-03 and B697 series links without modification.
• Standardized Housing: Designed for rapid installation into existing limit brackets and wiring harnesses.
• Critical Protection: Acts as a failsafe against blower motor failure or restricted airflow conditions.

What causes a 333F fuse link to trip in a Rheem furnace?
A tripped fuse link typically indicates a flame rollout, restricted secondary heat exchanger, or a failed indoor blower motor causing excessive internal cabinet temperatures.

Can the 44-20037-03 replace a different temperature-rated link?
No. You must always match the 333F temperature rating specified by the manufacturer to ensure the safety limit restores or breaks the circuit at the engineered threshold.

Is this fuse link resettable?
No, this is a one-time thermal cutoff. Once the internal bridge melts due to high heat, the part must be replaced to restore furnace operation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.