Description
Rheem-Ruud 47-21900-06 Manual Reset Limit Switch Overview
The Rheem-Ruud 47-21900-06 is a precision temperature control limit switch engineered for use in Rheem and Ruud heating systems. Designed to protect your equipment from dangerous overheating conditions, this switch opens at a fixed 180°F temperature and requires a manual reset before the system can resume normal operation — providing an added layer of safety by ensuring a technician inspects the unit before restart.
Key Features
- Fixed open temperature: 180°F — provides consistent, reliable overheat protection
- SPST (Single Pole, Single Throw) Normally Closed switch configuration
- Manual reset required after trip — prevents automatic restart without technician inspection
- OEM Rheem-Ruud replacement part for direct, drop-in compatibility
- Designed for use in Rheem and Ruud furnaces and heating equipment
How It Works
Under normal operating conditions, the limit switch remains closed, allowing the heating system to function. If the air temperature around the switch reaches the fixed 180°F threshold — indicating an overheating condition — the switch opens and interrupts the circuit, shutting down the burner or heating element. Because this is a manual reset device, the switch will not automatically close when temperatures drop. A qualified technician must physically reset the switch after diagnosing and correcting the root cause of the overheat condition.
Application
- Replacement limit switch for Rheem and Ruud residential and light commercial furnaces
- Suitable for gas furnace heat exchanger overheat protection
- Ideal for use wherever a 180°F fixed-open, manually resettable safety control is required
Specifications
- SKU: 47-21900-06
- Brand: Rheem-Ruud
- Switch Type: SPST Normally Closed
- Open Temperature: 180°F (Fixed)
- Reset Type: Manual Reset
- Control Type: Temperature Limit Switch
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