Description
Rheem-Ruud 47-21711-11 Board Mounted General Purpose Limit Switch
The Rheem-Ruud 47-21711-11 is a precision-engineered, board-mounted general purpose limit switch designed to protect HVAC equipment from overheating conditions. With a fixed open temperature of 180°F and a fixed close temperature of 160°F, this temperature control device provides reliable, repeatable safety cutout performance in furnaces and air handling equipment. Its auto-reset functionality means the switch automatically restores circuit continuity once temperatures return to safe operating levels, reducing service calls and downtime.
Key Features
- Fixed Open Temperature: 180°F — interrupts circuit to prevent overheating
- Fixed Close Temperature: 160°F — auto-resets circuit when temperature drops to safe level
- Switch Type: SPST (Single Pole, Single Throw) Normally Closed
- Auto Reset operation — no manual intervention required after temperature recovery
- 7″ Insertion Length — designed for deep insertion into furnace heat exchangers or plenums
- Board Mounted design for secure, vibration-resistant installation
- OEM replacement part for Rheem and Ruud heating equipment
Product Specifications
- SKU / Part Number: 47-21711-11
- Brand: Rheem-Ruud
- Open Temperature: 180°F (Fixed)
- Close Temperature: 160°F (Fixed)
- Switch Configuration: SPST Normally Closed
- Reset Type: Auto Reset
- Insertion Length: 7 inches
- Mounting Style: Board Mounted
- Application: General Purpose Limit Switch / Temperature Control
Application & Compatibility
This limit switch is a direct OEM replacement component for Rheem and Ruud furnaces and heating systems. It is installed on the control board and senses plenum or heat exchanger temperatures to protect the system from unsafe high-temperature conditions. The normally closed SPST configuration ensures the heating circuit remains active during normal operation and opens only when the 180°F threshold is reached, shutting down the burner to prevent equipment damage or fire hazard.
Reviews
There are no reviews yet.