Rheem-Ruud 47-17359-30 Limit Switch

The Rheem-Ruud 47-17359-30 Limit Switch is a critical safety component designed for high-limit temperature monitoring in residential and commercial HVAC furnace systems. This OEM replacement part features a Single Pole Single Throw (SPST) normally closed configuration, engineered to interrupt the burner circuit when temperatures exceed safe operating parameters. With a fixed open temperature of 200°F and a fixed close temperature of 180°F, this red color-coded limit control provides precise thermal regulation and prevents heat exchanger damage. The auto reset functionality allows for seamless system recovery once temperatures stabilize within the normal range. Rated for 230VAC and up to 25A, this general purpose limit switch utilizes 1/4-inch quick-connect terminals for a secure electrical interface. For contractors performing preventative maintenance or emergency repairs, verifying the 47-17359-30 part number ensures compatibility with specific Rheem and Ruud units, maintaining factory specifications for airflow safety and operational reliability.

Key Benefits for Technicians:

• Exact OEM Replacement: Matches factory specifications for Rheem-Ruud 47-17359-30 to ensure proper fit and sequence of operation.
• Automated Thermal Protection: Features a 200 degree F fixed open setpoint and auto reset to protect the heat exchanger from overheating.
• Durable Construction: Built for high-amperage applications with a 25A maximum current rating at 230V.
• Easy Identification: Red color coded housing allows for quick visual verification in the field during furnace limit switch troubleshooting.
• Universal Mounting: Enclosed disc face design with 3/8-inch maximum insertion depth for standard airstream placement.

Common Questions:

How do I test the 47-17359-30 limit switch during a service call?
Use a multimeter to check for continuity across the terminals at room temperature. Since this is a normally closed switch, you should see zero or near-zero resistance. If the switch remains open at ambient temperature, it has likely failed and requires replacement.

What causes a 200°F furnace limit switch to trip repeatedly?
Main causes include restricted airflow from a dirty filter, an undersized duct system, or a failing blower motor. If the auto reset occurs but the system trips again, verify static pressure and temperature rise across the heat exchanger.

Can I use this switch in both 120V and 240V systems?
Yes, while it is maximum rated for 230VAC, it is compatible with standard 24V control circuits and 120V systems typical of most Rheem-Ruud furnace configurations.

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.