Schneider Electric SE 8501-XDO-20 Control Relay

The Schneider Electric Square D 8501-XDO-20 NEMA Type X control relay is a four‑pole machine‑tool style relay in the 8501 XDO family, offering two normally open power contacts for simple control paths in industrial panels. It is rated for up to 10 A resistive at 600 VAC, enabling direct switching of loads such as lamps, solenoids, or small motors from standard AC power rails. The variant 8501XDO20V66 lists a coil rated for 230/250 VDC, allowing direct interfacing with common DC control sources in automation equipment. A hallmark of the 8501 X family is its modularity: the basic four‑pole unit can be expanded to six or eight poles by installing an adder deck, supporting more complex control schemes without swapping the base relay. The contacts are replaceable and convertible, with color‑coded terminals to ease field wiring and maintenance, and the relay is designed for rugged machine‑tool and industrial control environments. With compatibility across Square D/NEMA relays and a compact footprint, the 8501-XDO-20 is well suited for start/stop interlocks, signaling circuits, and straightforward control sequences in control panels where a compact, serviceable relay is required.