Rheem-Ruud 47-20045-02 Limit Switch

The Rheem-Ruud 47-20045-02 Limit Switch is a critical safety component designed for high-voltage HVAC systems. As a furnace high limit switch, this DPST normally closed switch is engineered to break the electrical circuit if internal plenum temperatures exceed safe operating parameters. This specific model features a 150°F fixed open temperature and a 110°F fixed close temperature, facilitating an auto reset function once the system cools to a safe level. This part is the direct replacement for 47-20045-01, ensuring seamless HVAC part compatibility for technicians servicing Rheem and Ruud equipment. Rated for 230VAC applications, the switch is red color coded for rapid field identification. It offers versatile installation options, including push-in receptacles for stripped wire, female receptacles for 1/4 inch male flag connectors, and field-mountable screw terminals. The inclusion of mounting adapters and strain relief bushings makes it a reliable overhead protection solution for professional contractors.

Key Benefits:

• Precision Temperature Control: Fixed 150°F trip and 110°F reset points maintain tight safety tolerances in the heat exchanger.
• Enhanced System Safety: The Double Pole Single Throw (DPST) configuration provides robust circuit interruption for 230V heating circuits.
• Universal Mounting Hardware: Includes adapters to accommodate various legacy mounting hole patterns in older furnace models.
• Manual Fan Override: Integrated flexibility allows for continuous fan operation to assist with system diagnostics or airflow management.
• Simplified Wiring: Multiple terminal styles eliminate the need for specialized crimping tools during emergency calls.

Common Questions:

Is the 47-20045-02 a manual or auto-reset switch?
This is an auto reset limit switch. It will automatically re-engage the circuit once the temperature drops to the 110°F closing threshold.

Can I use this to replace a 47-20045-01?
Yes, the 47-20045-02 is the direct manufacturer-specified replacement for the discontinued 47-20045-01 model.

What does the red color coding indicate on this limit switch?
The red color coding is an industry-standard visual indicator for specific temperature ranges and switch configurations within the Rheem-Ruud parts ecosystem, ensuring technicians install the correct thermal protection device.

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.