Description
The Rheem-Ruud 47-21663-01 is an OEM general purpose temperature limit switch engineered for precise, reliable over-temperature protection in Rheem and Ruud heating systems. Color-coded green for fast field identification, this switch provides automatic reset operation and is designed to meet the demands of residential and light commercial HVAC applications.
Key Features
- Fixed close (open-circuit) temperature: 130°F — switch opens circuit when temperature is reached
- Fixed open (reset) temperature: 140°F — switch resets automatically when temperature drops
- SPST (Single Pole, Single Throw) normally closed configuration
- Auto reset operation — no manual intervention required after cool-down
- Green color coding for quick visual identification during installation and service
- OEM replacement part for Rheem and Ruud heating equipment
- General purpose limit switch design for broad HVAC compatibility
Specifications
- SKU / Part Number: 47-21663-01
- Switch Type: SPST Normally Closed
- Fixed Close Temperature: 130°F
- Fixed Open Temperature: 140°F
- Reset Type: Automatic
- Color Code: Green
- Application: General Purpose Temperature Limit Control
- Compatible Brands: Rheem, Ruud
Application
This limit switch is a direct OEM replacement for Rheem and Ruud furnaces and air handlers where temperature limit protection is required. The normally closed SPST contact opens the control circuit when the monitored surface or air temperature reaches 130°F, interrupting operation to prevent overheating. Once temperatures fall back to the reset threshold, the switch automatically restores the circuit — minimizing downtime and eliminating the need for manual reset procedures. The green color code allows technicians to quickly confirm correct switch selection during multi-switch installations.
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