What it is and where it sits
The Square D XUYAFVCO966S is a fiber-optic photoelectric sensor in the Telemecanique XUY detection line, catalogued under Photoelectric Sensors.
Sourcing posture for the BOM line
The order code is quoted to order against an RFQ, which is the right path when a maintenance team wants a known production-line part landed against a documented part number rather than a generic surplus substitution.