Brand: VIAIR (USA)
Product Name:VIAIR Air pump Pressure Switch
Wiring description: This pressure switch is no pressure when it is open, it will close when the pressure reaches 145PSI, a line connected to the relay, a line connected to the negative power supply, so that the pressure switch control relay, relay control a pump, a pump to the reservoir the pneumatic cylinders, when tank pressure reaches 145PSI pressure switch will close, resulting in the relay closed, resulting in a pump relay closed to stop working, this is a fully automated system to maintain pressure.