Rheem-Ruud 47-25117-01 Limit Switch

The Rheem-Ruud 47-25117-01 Limit Switch is a critical safety component designed for precise temperature control in furnace and HVAC systems. This OEM replacement part features a Single Pole Single Throw (SPST) configuration and is normally closed during standard operation. Built for durability, it functions as a high limit safety, safeguarding the heat exchanger from damage caused by restricted airflow or overheating. The switch is calibrated to a fixed open temperature of 140 degrees F, at which point it breaks the circuit to shut down heating. Once the internal temperature drops to the fixed close temperature of 100 degrees F, the auto-reset mechanism restores continuity, allowing the system to resume normal cycling.

This general purpose limit switch utilizes a flanged airstream mounting design, ensuring optimal positioning within the supply air or near the burner assembly. It is engineered to handle up to 230VAC and typically interfaces via 1/4 inch quick connect terminals. For technicians performing diagnostics, this part is a direct Rheem 47-25117-01 match for numerous Ruud and Weather King residential units. Utilizing genuine OEM parts ensures proper limit switch compatibility and maintains the integrity of the original equipment's factory safety parameters.

• Fixed Thermal Calibration: Precisely set to 140°F open and 100°F close for consistent safety shutoff.
• Auto-Reset Functionality: Automatically restores system operation after cooling, reducing unnecessary service calls for simple thermal trips.
• Direct OEM Compatibility: Specifically engineered for Rheem and Ruud brand equipment to ensure fit and electrical sequence integrity.
• Standardized Electrical Interface: Features 1/4 inch terminals for rapid field replacement and normally closed logic.

• What causes a Rheem furnace to trip its limit switch? A trip is usually triggered by restricted airflow, such as a clogged filter, a failing blower motor, or blocked return vents.
• How do I test a 47-25117-01 for continuity? With power disconnected and the part at room temperature, use a multimeter to check the terminals; a normally closed switch should show continuity until its 140°F opening threshold is reached.
• Can this switch be used in 120V and 240V systems? Yes, the Rheem-Ruud 47-25117-01 is rated for up to 230VAC, making it compatible with various voltage configurations common in HVAC controls.

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.