Trane SWT3937 Switch

The Trane SWT3937 is a precision-engineered thermal limit switch designed for critical temperature regulation in HVAC and light commercial applications. This OEM thermal switch features a reliable 125°F open and 95°F close threshold, serving as a primary safety control to monitor airstream temperatures and prevent overheating conditions. Built with an SPST contact arrangement and an enclosed disc design, the SWT3937 ensures consistent performance with a high-cycle life of 100,000 operations. The quick-connect terminals and airstream mount configuration allow for straightforward retrofitting or replacement during routine maintenance. Designed for compatibility with various Trane and American Standard units, this HVAC temperature control operates at 120 VAC with a 5.8 FLA rating, providing the responsive thermal protection required for modern furnace and heat pump systems.

• Precise Thermal Regulation: Calibrated with a 125°F open (cut-out) and 95°F close (cut-in) setpoint for accurate limit protection.
• Industrial-Grade Durability: Rated for a 100,000-operation life cycle, ensuring long-term reliability in high-cycle environments.
• Standardized Connectivity: Features tin-plated brass quick connect terminals for high conductivity and simplified wiring.
• Auto Reset Functionality: Automatically restores system operation once temperatures return to the 95°F safety threshold.
• Optimized Form Factor: Compact 2.29-inch height and lightweight 0.1 lb design specifically for airstream mounting.

What is the primary function of the Trane SWT3937?
The SWT3937 serves as a safety limit switch that opens the circuit when temperatures reach 125°F to protect internal components from thermal damage.

Is this switch an auto-reset or manual-reset type?
This is an auto-reset thermal switch. Once the detected temperature drops to 95°F, the switch will automatically close to resume normal operation.

Which HVAC systems are compatible with this part?
It is widely utilized in Trane and American Standard furnaces, package units, and air handlers that require an enclosed disc limit with these specific temperature ratings.

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.