Description
The Rheem-Ruud 47-21711-04 is an OEM general purpose limit switch engineered for precise temperature control and reliable overheat protection in Rheem and Ruud heating systems. Featuring a board-mounted design with a 7-inch insertion length, this limit switch integrates directly with the furnace control board for a clean, secure installation.
This switch operates as a Single-Pole, Single-Throw (SPST) Normally Closed device with automatic reset functionality, meaning it will automatically restore circuit continuity once temperatures return to a safe operating range — minimizing downtime and service calls.
Key Specifications
- Fixed Open Temperature: 200°F
- Fixed Close Temperature: 180°F
- Switch Type: SPST Normally Closed (NC)
- Reset Type: Auto Reset
- Insertion Length: 7 inches
- Mounting Style: Board Mounted
- Compatible Brands: Rheem, Ruud
- Part Number: 47-21711-04
Features & Benefits
- OEM replacement part ensures proper fit and reliable performance in Rheem and Ruud furnaces
- Auto reset design automatically restores normal operation once safe temperatures are reached
- SPST NC configuration opens the circuit at 200°F to protect against overheating
- 7-inch insertion length provides accurate sensing within the heat exchanger or air stream
- Board-mounted design simplifies installation and reduces wiring complexity
- Fixed temperature settings eliminate the need for manual calibration
Application
Designed as a direct OEM replacement for Rheem and Ruud residential and light commercial furnaces, this limit switch monitors supply air or heat exchanger temperatures to protect equipment from dangerous overheating conditions. When temperatures exceed 200°F, the switch opens to interrupt the burner circuit; once temperatures drop back to 180°F, the switch automatically resets and restores normal operation.
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