What this part is
The Square D Sensors & Safety XUB1APAWL2 is a cylindrical photoelectric sensor in the Telemecanique XUB series, and it is the form factor a panel builder expects when retrofitting a through-beam or diffuse detection point into a conveyor or machine guarding line.
Where the class earns its keep
Cylindrical photoelectric sensors in this Telemecanique XUB line are the workhorses for object detection at conveyor transfer points, lane diverters, and accumulator zones, where the M18 barrel threads into a standard through-hole bracket and the sensing head aligns to the package or tote edge. On a motor-driven roller conveyor, a sensor of this form factor is what drops into a zone-control accumulation gap to release the next carton, which is why a sourcing buyer replacing one is rarely redesigning the bracket — they are matching the original M18 mechanical envelope and the same wiring pinout so the swap clears the jam automatically without rewiring the drop.