Trane CNT1405 Limit Switch

The Trane CNT1405 is a high-precision 55-65F Auto Limit Switch designed for critical temperature monitoring within HVAC systems and industrial air handlers. This SPST (Single-Pole Single-Throw) fixed-setting control serves as a vital safety component, ensuring your equipment operates within calibrated parameters to prevent thermal-related failure or freezing conditions. Engineered for rapid response, the switch is set to open at 65°F and close at 55°F, making it an essential replacement part for maintaining consistent climate control in commercial or residential packaged units and RTUs.

For contractors servicing Trane air handlers or heat pumps, this genuine OEM limit switch ensures a direct drop-in fit, eliminating the diagnostic headaches associated with generic alternatives. The robust construction and compact footprint allow for efficient installation in tight service panels. Whether you are addressing short cycling issues or a blower that runs continuously, the CNT1405 provides the reliable circuit interruption necessary to keep the system protected. Using a Trane replacement part maintains the integrity of the original system design and provides the exact technical specifications required for safe operation.

• Automatic Reset: Simplifies system recovery by closing the circuit automatically once the temperature drops to 55°F.
• OEM Compatibility: Specifically engineered for Trane high-limit applications to ensure precise calibration and timing.
• Versatile Application: Suitable for use in furnaces, air handlers, and process control systems requiring low-temperature sensing.
• Industrial Build: Durable contact design handles frequent switching cycles common in commercial HVAC environments.

Common Questions about the Trane CNT1405

The switch is designed to open at 65°F. If the internal system temperature exceeds this limit, the limit switch will break the circuit to protect delicate components or sensors. Common causes include restricted airflow or improper sensor placement.

No. This is an auto-reset limit switch. You should always replace a safety control with the exact same reset type and temperature ratings specified by the manufacturer to ensure system safety remains intact.

Using a multimeter, you should find a closed circuit when the ambient temperature is below 55°F. If the circuit remains open at lower temperatures, the switch may have failed and requires a direct replacement.

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.