Description
Rheem-Ruud 47-21711-07 General Purpose Limit Switch Overview
The Rheem-Ruud 47-21711-07 is an OEM board-mounted general purpose limit switch engineered for precise temperature-based protection in Rheem and Ruud heating equipment. Designed with a fixed open temperature of 160°F and a fixed close temperature of 140°F, this limit switch automatically interrupts the circuit when unsafe temperatures are detected and resets once conditions return to normal — keeping your system protected without manual intervention.
Key Features
- Fixed Open Temperature: 160°F — circuit opens to shut down heating operation at high-limit threshold
- Fixed Close Temperature: 140°F — circuit automatically resets once temperature drops to safe level
- Auto Reset operation — no manual reset required after a high-limit trip
- SPST Normally Closed switch configuration — circuit is closed under normal operating conditions
- 7″ Insertion Length — designed for proper depth placement within the heat exchanger or plenum
- Board Mounted design — mounts directly to the control board for a clean, secure installation
- OEM Rheem-Ruud replacement part — ensures compatibility and reliable performance
Product Specifications
- Part Number: 47-21711-07
- Brand: Rheem-Ruud
- Control Type: Temperature / Limit Switch
- Switch Type: SPST (Single Pole, Single Throw)
- Switch State: Normally Closed
- Reset Type: Auto Reset
- Open Temperature: 160°F (Fixed)
- Close Temperature: 140°F (Fixed)
- Insertion Length: 7 inches
- Mounting Style: Board Mounted
Application
This limit switch is a direct OEM replacement for Rheem and Ruud furnaces and air handlers requiring high-limit protection. It monitors plenum or heat exchanger temperatures and opens the circuit to disable the burner or heating element if temperatures exceed the 160°F threshold, preventing equipment damage and potential safety hazards. The auto-reset feature restores normal operation once temperatures fall back to 140°F, minimizing downtime.
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