Johnson Controls P70AA-150 50/300 Psi SPST 20/120 PSI Differential Pressure Switch

The Johnson Controls P70AA-150 switch is a standard pressure switch that can be a single pole single throw (SPST) type, for measuring pressure variations in HVAC and Industrial systems. It measures operates in a broad pressure range of 50 to 300 psi for fixed points and 20 to 120 psi for differential pressure. This switch is critical to maintaining the system’s integrity because it monitors pressure differentials. It has an Open-Low function initiated when the differential pressure is below the low limit of 20 psi. This action may trigger alarms, shut-downs, or system changes to prevent the continuation of equipment damage and ensure efficient and safe operation.