Johnson Controls P170AA-118 Pressure Control Switch 100/400PSI Open-Low

The Johnson Controls P170AA-118 is a pressure control switch that is used in heating ventilation and air conditioning systems. It plays a role in pressure-reducing the definite range by changing electrical circuits attached to it according to the pressure of the system. It is a single pole single throw SPST switch, meaning the switch has only one input and only one output that is connected or disconnected just by pressure. Therefore for a given low pressure, the switch can close the circuit and thus turn on the attached devices. Air compressors, refrigeration systems, and boilers are some of the areas where pressure control switches are often applied.