Trane SWT3277 Pressure Switch

For high-pressure protection in commercial and industrial HVACR systems, the Trane SWT3277 Pressure Switch (also identified as Trane SWT03277) is a critical SPST high pressure switch designed for overpressure protection. This single-pole, single-throw component is engineered to maintain system integrity by monitoring refrigerant line pressures. The switch features 650 PSI open and 500 PSI close settings, providing a precise pressure switch cut-out to prevent compressor damage during high-load conditions. Built with a 6-inch body and 91-inch leads, this OEM Trane replacement part installs via quick connect terminals and is a direct substitute for legacy SWT3277 units found in 4A7A5018 and 4A7A5024 models.

Key Benefits:

• High-limit safety: Engineered with a 650 PSIG trip point to immediately interrupt the control circuit upon sensing excessive head pressure.
• Reliable reset: Features a fixed 500 PSIG reset point, ensuring the system remains offline until pressures stabilize within safe operating parameters.
• Universal Trane compatibility: Serves as a standard high pressure control for 3-10 ton packaged cooling units, heat pumps, and air handlers.
• Electrical versatility: Rated for 8.0 FLA / 48 LRA at 120/240 VAC and 125 VA pilot duty at 24 VAC, facilitating integration with various HVAC control circuits.

Common Questions:

• What are the specific pressure ratings for the SWT3277? This switch is calibrated to open the circuit at 650 PSI and close (reset) at 500 PSI.
• Is the SWT3277 compatible with newer Trane models? Yes, the SWT3277 is the predecessor to SWT03277 and remains a direct OEM replacement for packaged RTUs and residential split systems.
• How do I test the continuity of this pressure switch? Using a multimeter set to ohms, you should see continuity (closed circuit) under normal operating pressures below 650 PSI; an open circuit indicates either a high-pressure state or a faulty internal diaphragm.

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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.