Rheem-Ruud 47-20045-06 Limit Switch

The Rheem-Ruud 47-20045-06 Limit Switch is a critical safety component designed for high-performance HVAC system protection. This OEM furnace limit switch features a DPST Normally Closed configuration, ensuring reliable circuit interruption when plenum temperatures exceed safe operating parameters. With a fixed open temperature of 130 degrees F and a fixed close temperature of 90 degrees F, this auto reset thermal switch prevents heat exchanger damage and ensures consistent blower cycling. The red color-coded housing allows for immediate identification during field service, and the bimetal sensing element provides high-accuracy response times. As a genuine Rheem replacement part (also cross-referenced with 8404-5543 and 47-20034-06), this limit control is built for service longevity in residential and light commercial air handlers and furnaces. For technicians troubleshooting short-cycling or blower-only operational issues, verifying the 230VAC compatibility and temperature setpoints of the 47-20045-06 is standard procedure for restoring factory-spec safety and performance.

• Precise Thermal Calibration: Fixed settings at 130°F open and 90°F close eliminate the need for field adjustments and ensure strict safety compliance.
• DPST Configuration: Dual-pole, single-throw design provides a robust electrical interface for 230VAC control circuits.
• Automatic Reset Logic: The auto reset limit switch functionality restores system operation once safe temperatures are reached, reducing unnecessary service calls for simple over-temp events.
• Broad Compatibility: Directly replaces multiple regional and legacy part numbers, making it a versatile addition to a contractor's stock.
• OEM Reliability: Integrated helical bimetal element offers superior vibration resistance and switching accuracy compared to generic aftermarket alternatives.

Is the 47-20045-06 a universal HVAC limit switch?
No, this is a specific OEM component calibrated for Rheem and Ruud equipment. Always verify the fixed temperature setpoints and DPST configuration against your specific model's data plate before installation.

What causes this limit switch to trip frequently?
While the switch is designed to trip at 130°F, frequent activation usually indicates airflow restrictions, such as a clogged filter, blocked return, or a failing blower motor, rather than a defect in the switch itself.

Can I use this in a 120V system?
While the switch is rated for 230VAC, it is a dry contact component; however, it is professionally recommended to strictly follow the manufacturer's wiring diagram to maintain the electrical integrity of the safety loop.

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.