Description
The Trane CNT3781 is an OEM auto-reset cutout (CO) limit switch engineered for reliable high-temperature protection in Trane heating systems. Calibrated to open at 180°F, this limit switch monitors supply-air or heat exchanger temperatures and interrupts the burner circuit when unsafe conditions are detected — then automatically resets once temperatures return to a safe range, minimizing nuisance service calls.
With a 10-7/8″ insertion length, the CNT3781 is designed to reach the correct sensing point within the air stream or heat exchanger plenum, ensuring accurate temperature detection and consistent protection. As a genuine Trane replacement component, it delivers the precise fit and performance characteristics required to maintain system safety and efficiency.
Key Features
- Auto-reset (CO) cutout design — automatically resets after temperature drops to safe level
- 180°F cutout temperature rating for accurate high-limit protection
- 10-7/8″ insertion length for proper sensing depth in Trane furnace applications
- OEM Trane replacement part — direct-fit for compatible Trane heating equipment
- Interrupts burner circuit on over-temperature condition to protect heat exchanger and equipment
- Durable construction for long-term reliability in demanding HVAC environments
Specifications
- SKU: CNT3781
- Brand: Trane
- Switch Type: Auto-Reset Cutout (CO) Limit Switch
- Cutout Temperature: 180°F
- Insertion Length: 10-7/8″
- Application: Trane furnace and heating system high-limit protection
Application
The CNT3781 is intended for use as a direct OEM replacement in Trane furnaces and air handlers requiring a 180°F auto-reset limit switch with a 10-7/8″ insertion length. Always consult equipment documentation or a qualified HVAC technician to confirm compatibility before installation.
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