Square D by Schneider Electric 8501XDO20XTD1V66 Relay

Square D by Schneider Electric 8501XDO20XTD1V66 is a NEMA Type X control relay designed for machine‑tool and industrial control applications. It provides two normally open contacts (2NO) in a rugged, modular package that accepts interchangeable contact cartridges and can be expanded with adders to increase pole count for more complex logic. The relay is DC‑operated with a coil rated for 230/250 VDC; the 8501XDO20V66 family lists a 10 A resistive load capability at up to 600 VAC and a coil power around 18 W, with panel‑mount/screw‑clamp terminals and open enclosure dimensions roughly 2.23 in W × 5.17 in D × 3.56 in H. This model is compatible with standard 8501XC1 contact cartridges and is commonly used to control motors, conveyors, and other machine‑tool or automation loads; its modular design supports field configuration changes via adders and replacement contact cartridges, reducing downtime.