Schneider Electric 9013GHG-3J57X Pressure Switch

Schneider Electric's Square D 9013GHG-3J57X is a diaphragm‑actuated pressure switch with an integrated unloader, designed for small electrically driven air compressors and configured as a single‑port unit that operates in the 120–150 psi range (cut‑in at 120 psi, cut‑out at 150 psi). It features 3/8 in FNPT ports, two‑pole snap‑action contacts in a DPST arrangement, UL listed and CSA certified construction, and a NEMA 1 enclosure (with optional NEMA 3R/4 enclosures available through some distributors); the design includes a two‑way pressure relief valve (unloader) that vents head pressure at cut‑off to ease shut‑down and reduce stress on the system, and the device is diaphragm actuated and rated for 50/60 Hz operation. Typical applications include regulating tank pressure on small air compressors up to roughly 300 psi and supporting standard 3/8" FNPT fittings with control voltages up to 600 VAC or 125–600 VDC, depending on the specific variant and installation.