Pressure switches are electronic items that are used to trigger an action when a certain set pressure is reached. The most common application is to stop (and start) a compressor when the set pressure is reached. The pressure switch is usually mounted on the receiver and when the receiver or ‘system pressure’ reaches the set pressure the compressor stops. When the system pressure then falls below a secondary pressure the pressure switch will then cause the compressor to restart, building pressure in the system again.
Pressure switches are usually mounted in the system receiver but they can be mounted elsewhere in the compressed air system.