Description
Rheem-Ruud 47-21663-09 General Purpose Limit Switch Overview
The Rheem-Ruud 47-21663-09 is an OEM general purpose limit switch engineered for precise temperature control in heating systems. Color-coded green for easy identification during installation and service, this auto-reset switch protects equipment by interrupting the circuit when unsafe temperatures are detected and automatically restoring operation once conditions return to normal.
Key Specifications
- Fixed Close (Cut-In) Temperature: 120°F
- Fixed Open (Cut-Out) Temperature: 150°F
- Switch Type: SPST (Single-Pole, Single-Throw)
- Normal Switch Position: Normally Closed (NC)
- Reset Type: Auto Reset
- Color Code: Green
- OEM Part Number: 47-21663-09
- Compatible Brand: Rheem / Ruud
Features & Benefits
- Auto reset functionality eliminates the need for manual intervention after a trip event, reducing service calls
- Normally closed SPST design opens the circuit at 150°F to prevent overheating and closes again at 120°F to resume normal operation
- Green color coding allows technicians to quickly identify and verify the correct limit switch during installation or replacement
- Direct OEM replacement ensures proper fit and reliable performance in Rheem and Ruud heating equipment
- Fixed temperature setpoints provide consistent, repeatable protection without adjustment
Application
Designed as a direct OEM replacement for Rheem and Ruud furnaces and heating appliances, the 47-21663-09 limit switch monitors supply air or heat exchanger temperatures to safeguard against overheating conditions. Its auto-reset design makes it ideal for general purpose limit control applications where automatic recovery is required after a temperature fault clears.
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