How to switch the pressure switch
In the figure, the contactor is the same, and the intermediate relay in the drawing is not necessary.
You that is a contactor? Connect the map of the upper end of the power supply under the terminal device, you pay attention to see if the control circuit is 220 or 380
Pressure switch wiring as shown, the pressure switch contacts can not directly drive the load, the need for intermediate relay contact isolation.
Three contacts, upper limit, lower limit, common point.
