Rheem-Ruud 47-20045-03 Limit Switch

The Rheem-Ruud 47-20045-03 Limit Switch is a critical safety component designed for precise thermal regulation in high-efficiency HVAC systems. This red color-coded auto reset limit switch functions as a DPST normally closed switch, engineered to interrupt the electrical circuit when internal temperatures exceed safety parameters. With a fixed open temperature of 170 degrees F and a fixed close temperature of 130 degrees F, this OEM replacement part ensures equipment protection against overheating scenarios. Designed for seamless integration into Rheem furnace models and Ruud air handling units, this high-limit control provides reliable thermal protection without the need for manual intervention after a trip. Its robust construction and exact calibration make it an essential furnace safety switch for maintaining system integrity and operational safety in residential and commercial applications.

Key Benefits

• Automatic Reset Functionality: Restores continuity once temperatures drop to 130°F, reducing unnecessary service calls for manual resets.
• Precision Calibration: Fixed 170°F opening point prevents heat exchanger damage and ensures ANSI compliance.
• Double Pole Single Throw (DPST): Provides reliable circuit interruption for enhanced system safety over standard single-pole alternatives.
• OEM Compatibility: Exact Rheem-Ruud 47-20045-03 specifications ensure perfect fitment and terminal alignment for fast installation.

Common Questions

How do I identify if this limit switch is tripped?
A tripped limit switch typically results in the indoor blower motor running continuously while the burners fail to ignite. Use a multimeter to check for continuity across the terminals; no continuity at room temperature indicates a failed switch.

Will this switch fit other furnace brands?
While primarily engineered for Rheem and Ruud equipment, this switch may serve as a functional equivalent for other units requiring a 170°F/130°F DPST configuration. Always verify the part number cross-reference before installation.

What does the red color coding signify?
The red coding is a visual indicator for technicians to quickly identify the specific temperature rating and switch logic, ensuring the correct thermal limit is used during field replacement.

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.