Description
The Rheem-Ruud 47-21900-05 is an OEM temperature control limit switch engineered for precise overheat protection in Rheem and Ruud heating equipment. Featuring a fixed 200°F open temperature, this switch automatically interrupts the circuit when a dangerous temperature threshold is reached, helping to prevent equipment damage and ensure safe operation. The manual reset design requires a deliberate technician reset after a trip event, adding an extra layer of safety by preventing automatic restart until the root cause of the overheat condition has been identified and corrected.
Key Features
- Fixed open temperature: 200°F — provides consistent, reliable overheat protection
- SPST (Single-Pole, Single-Throw) Normally Closed switch configuration
- Manual reset required after trip — prevents automatic restart for added safety
- OEM Rheem-Ruud replacement part for direct, drop-in compatibility
- Designed for use in Rheem and Ruud furnaces and heating systems
Product Specifications
- SKU: 47-21900-05
- Brand: Rheem-Ruud
- Fixed Open Temperature: 200°F
- Switch Type: SPST (Single-Pole, Single-Throw)
- Switch Position: Normally Closed (NC)
- Reset Type: Manual Reset
- Application: Temperature limit control for furnaces and heating equipment
Why Choose the Rheem-Ruud 47-21900-05?
As a genuine OEM replacement part, the 47-21900-05 limit switch ensures proper fit and function within Rheem and Ruud heating systems. The manual reset feature is a critical safety measure — after the switch trips at 200°F, the system will not restart until a qualified technician manually resets the control, ensuring that any underlying issue causing the high-temperature condition is addressed before the equipment is returned to service. This switch is an essential component for maintaining safe, code-compliant heating system operation.
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