The pressure switch is used to start and stop a compressor to maintain pressure in a pneumatic system.

Voltage: Three phase
Unloader connection Brass ferrule
Thread: 1/4 BSP
Ports: Four way
Pressure rating: Max 12.5 Bar

Air pressure is important:

Compressors need quite a bit of power to generate compressed air and it is
advised to keep the electrical cable to a minimum length. A 10m cable lead
should have a core thickness of at least 2.5mm. If distance is important to
supply compressed air, rather increase the length of hose instead of using an
extension lead.

An extension lead could shorten the life expectancy of the pressure switch.