What the part is and where it sits
The Square D Sensors & Safety XUB9BPAWL2 is a cylindrical photoelectric sensor in the Telemecanique detection line, listed under the Photoelectric Sensors category on this catalog record. The MPN carries UPC 389110159458, the check digit brokers and receiving desks use to match the box against the manifest on inbound shipments.
For a line-down spare, confirm the exact suffix on the housing label, then raise the RFQ against the current production run.