Schneider Electric PS2020 Air Compressor Pressure Switch

Schneider Electric’s Square D PS2020 air compressor pressure switch is a mechanical, diaphragm‑actuated control in the Pumptrol family that starts the compressor at a lower pressure and stops it at a higher pressure, and it includes an On/Off lever with a built‑in unloader to vent line pressure during startup. The PS2020M OEM variant is advertised for 100–135 psi, while common Square D 9013FHG12J52M1X configurations specify 95–125 psi with a ~30 psi differential, reflecting the range used across this family. It uses 1/4‑inch NPT ports for sensing and output connections, and is compatible with a broad voltage range (110–575 VAC) depending on amperage and phase, making it suitable as a replacement on single‑stage compressors that require a Square D/Pumptrol switch.