Trane CNT3782 Limit Switch

The Trane CNT3782 Limit Switch is a high-reliability safety component designed for precise thermal regulation in industrial and commercial HVAC systems. This 200F CO auto limit switch operates as an SPST normally closed device, engineered to interrupt the electrical circuit when internal plenum or heat exchanger temperatures reach the 200°F (93°C) set point. Featuring a 30°F differential, this HVAC high limit control utilizes an automatic reset configuration, restoring connectivity once temperatures drop to safe operating levels, thereby minimizing system downtime. Constructed for demanding environments, the CNT3782 replaces legacy part numbers including CNT03782 and is compatible with various Trane THC and YSC series rooftop units. This OEM Trane replacement part supports line-voltage applications up to 120/240 VAC with a 15A resistive rating, ensuring robust protection against furnace overheating and potential fire hazards in gas-fired or electric systems.

• Critical Overheat Protection: Triggers at 200°F to prevent damage to heat exchangers and surrounding components.
• Automatic Reset Functionality: Eliminates the need for manual intervention, allowing the system to resume operation after a 30°F temperature drop.
• Universal Voltage Compatibility: Rated for 120/240 VAC, making it suitable for a wide range of commercial heating controls.
• Durable OEM Build: Genuine Trane parts ensure exact fitment and longevity compared to generic aftermarket alternatives.
• Efficient Integration: Features standard 1/4-inch quick-connect terminals for rapid installation during field service calls.

What causes a Trane CNT3782 to trip frequently?
Repeated tripping typically indicates restricted airflow, such as a clogged filter, obstructed ductwork, or a failing blower motor, causing the system to exceed the 200-degree Fahrenheit cut-off.

Does this switch require manual resetting?
No, the CNT3782 is an auto reset limit switch. It will automatically close the circuit once the sensed temperature falls approximately 30°F below the trip point.

Is the CNT3782 interchangeable with the CNT03782?
Yes, CNT03782 is the current manufacturer part number that replaces the CNT3782, maintaining identical technical specifications and mounting footprints.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.