Trane SWT3402 High Pressure Switch Open 650 Close 550

The Trane SWT3402 is a high-pressure switch for HVAC equipment. As a safety device, it monitors the system's pressure. When the pressure is again 650 PSI, that switch opens and the power is cut off to the compressor. This protects the compressor from harm from high pressure. The switch automatically resets and restarts the compressor at 550 PSI when the pressure drops below a second predetermined point. By auto-regulating air pressure levels, the Trane prevents failures and extends HVAC equipment life. Moreover, it prevents pressure spike-related system shutdowns and therefore enables reliable performance and occupant comfort.