Description
The Trane CNT3783 is a Single Pole Single Throw (SPST), Normally Closed (N/C), Auto-Reset limit switch engineered to provide reliable high-temperature protection in Trane heating and HVAC systems. When supply air or heat exchanger temperatures exceed the 220°F set point, this limit switch opens the circuit to shut down the burner or heating element, preventing equipment damage and unsafe operating conditions. Once temperatures fall back within the safe range, the auto-reset function automatically restores the circuit — eliminating the need for manual intervention and reducing service calls.
Designed as a genuine Trane OEM replacement part, the CNT3783 ensures compatibility and performance that aftermarket alternatives cannot always guarantee. It is an essential safety component for maintaining the integrity of furnace and air handler operations.
Key Features
- SPST (Single Pole Single Throw) switching configuration
- Normally Closed (N/C) contact operation — opens on temperature rise
- Auto-Reset (A/R) — automatically resets when temperature returns to safe range
- 220°F operating/open temperature set point
- Genuine Trane OEM replacement part
- Protects heating equipment from overheating and thermal damage
Applications
- Trane gas furnaces and air handlers
- High-temperature limit protection circuits
- Burner and heating element safety shutoff
Specifications
- Part Number: CNT3783
- Brand: Trane
- Switch Type: SPST
- Contact Configuration: Normally Closed (N/C)
- Reset Type: Auto-Reset (A/R)
- Operating Temperature: 220°F
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