a lack of continuity indicates a failed internal contact

and building automation systems

Engineered for low-pressure steam heating and industrial process lines

this assembly maintains the integrity of the original equipment's manifold pressure and flame rectification signals

This relay is equipped with a 120VAC coil (rated for 110-120V) at 50/60 Hz

Trane SWT3555 Switch 320788-703 a lack of continuity indicatesThe Trane SWT3555 Switch is a critical low pressure cutout designed for precision monitoring in commercial and residential HVAC systems. Engineered for high reliability compressor protection, this snap action differential pressure switch features a fixed setpoint that triggers an open circuit at 24 PSI and restores the connection at 45 PSI. By acting as a fail safe, the Trane SWT3555 prevents the system from operating under a loss of charge condition