The Square D XUZD15 is a reflector cover designed for the XU series photoelectric sensors. It's a straightforward accessory — no wiring, no electronics — just the cover that goes over the reflector on the sensor head to protect it or manage the optical path. If you're maintaining a line with XU series sensors and the reflector cover is cracked or missing, this is the factory part that fits.
The UPC is 78590110091. The part is branded Square D Co. and carries the Telemecanique product description.