Rheem-Ruud 47-25350-06 Switch

The Rheem-Ruud 47-25350-06 Limit Switch is a critical safety component designed for fixed-temperature regulation in high-performance residential and commercial furnaces. As a Normally Closed (N/C) SPST switch, this auto reset limit control effectively monitors plenum temperatures to prevent heat exchanger damage or unsafe operating conditions. The switch is engineered to trip and fixed open at 170°F if overheating occurs, automatically returning to a fixed close at 150°F once internal temperatures stabilize.

Built for durability in demanding environments, this board mounted furnace limit switch features a 3-inch insertion length and precise brown/brown color coding for fast identification during field service. It is highly compatible with equipment from Rheem, Ruud, WeatherKing, and Thermal Zone. For technicians troubleshooting frequent cycling or blower fan issues, verifying the L170-20F temperature rating ensures the system operates within manufacturer-specified safety parameters without unnecessary downtime.

• Overheating Protection: Automatically breaks the circuit at 170°F to safeguard the furnace from high-temperature excursions.
• Automatic Reset Functionality: Resumes normal operation at 150°F, eliminating the need for manual intervention after a temporary thermal event.
• Precision Engineering: Board-mounted design with a 3" insertion depth ensures accurate sensing within the airflow stream.
• Broad Compatibility: Direct OEM replacement for multiple brands including Ruud and WeatherKing gas furnaces.
• Optimized Construction: Durable enclosed disc face and SPST configuration for consistent electrical performance at 120/230V.

Is this switch a direct replacement for an L170-20 limit control?
Yes, the 47-25350-06 is the standard OEM replacement for 170-degree limit controls featuring a 20-degree differential and 3-inch probe.

What causes this limit switch to trip frequently?
In most HVAC units, frequent tripping is caused by restricted airflow, such as a clogged filter, blocked return air, or a failing blower motor, rather than a failure of the switch itself.

Can this be used on both 120V and 230V circuits?
Yes, the electrical contacts are rated for both 120V and 230V AC applications common in central heating systems.

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.