Description
The Trane SWT04557 is an OEM replacement L150-30F high-limit switch engineered to protect Trane heating systems from dangerous overtemperature conditions. As a critical safety control component, this limit switch monitors supply-air or heat exchanger temperatures and interrupts the burner circuit when temperatures exceed the rated setpoint, preventing equipment damage and potential fire hazards.
How It Works
The L150-30F designation defines the switch’s operating parameters: it opens (trips) at 150°F to shut down the burner, then automatically resets and closes once temperatures drop by the 30°F differential, restoring normal operation at approximately 120°F. This automatic-reset design minimizes downtime while ensuring the system cannot re-energize until safe operating temperatures are restored.
Key Features
- OEM Trane replacement part — direct fit for compatible Trane furnace and air handler models
- Opens at 150°F to protect against overheating
- 30°F differential — automatically resets at approximately 120°F
- Interrupts burner/heating circuit on high-temperature fault
- Durable construction for long service life in demanding HVAC environments
- Drop-in replacement for fast, straightforward installation
Application
Designed for use in Trane gas furnaces and heating systems requiring an L150-30F high-limit safety switch. Always verify compatibility with your specific unit’s model and wiring diagram before installation.
Specifications
- Part Number: SWT04557
- Type: High-Limit Switch
- Model Code: L150-30F
- Open (Trip) Temperature: 150°F
- Differential: 30°F
- Reset Temperature: ~120°F
- Reset Type: Automatic
- Brand: Trane (OEM)
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