Square D 2FG85 Pressure Switch

Square D 2FG85 pressure switch is a diaphragm‑actuated air compressor switch from Schneider Electric’s Square D family, listed with a 9013FH model lineage and part number 9013FHG22J27X. It uses a 1/4" FNPS pressure connection and provides two normally closed contacts (2NC) for switching circuits up to 10 A at 575 V, with an unloader included for easier start‑ups. The device is preset to turn on at 80 psi and turn off at 100 psi, delivering a 20 psi differential within a 40–100 psi operating range, and it supports a maximum pressure of 100 psi. Its physical footprint is about 3.76 in deep, 3.71 in high, and 2.78 in wide, suitable for compact pump and compressor panels, and it is compatible with single‑phase or low‑hp three‑phase applications. The unit is designed for harsh environments, with an operating temperature span from -33 °F to 257 °F (-33 to 125 °C) and a Mexico origin. This model is commonly referenced as 2FG85 in listings and is used to reliably control small air compressors by providing defined cut‑in and cut‑out pressures.