The ABB NS31E‑25 is a compact AC contactor relay designed for switching and controlling auxiliary and control circuits in industrial automation and electrical control systems. It features a 4‑pole contact arrangement with three normally open (NO) contacts and one normally closed (NC) contact, enabling versatile control functions such as interlocks, signaling, and auxiliary switching. The device is operated by a 220 V AC coil and is intended for use in control panels, machines, and distribution equipment where reliable circuit control is required.
