Schneider Electric PS2-145-175 Pressure Switch

Schneider Electric PS2-145-175 Pressure Switch is a single-port air compressor control switch featuring an integral unloader valve and a factory setting of 145–175 psi. It is designed to cycle the compressor motor on and off within that pressure range, helping maintain steady system pressure while controlling startup and operating cycles. An unloader valve provides venting from the compressor head when the switch opens, which aids in faster restarts and reduced inrush. The unit is rated for up to 24 amps and includes a dedicated connection for the unloader, typically compatible with a 1/4" compression tube. This switch is commonly used on air compressors and similar pumping equipment in commercial and light industrial applications where reliable, fixed‑range pressure control is required.