What it is and what class it sits in
The Square D Sensors & Safety XUKC1PSMM12 is a photoelectric sensor in the Telemecanique XUK 50x50 body, listed under the Photoelectric Sensors category. On the receiving bench the part carries UPC 389110702128, which is the cleanest cross-check against the purchase order line. Photoelectric sensors in this class detect the presence, absence, or distance of a target by emitting a light beam and reading the return — typically retro-reflective, diffuse, or through-beam depending on the head — so the XUKC1PSMM12 belongs on the discrete-input side of a PLC or safety relay, switching on a target event rather than measuring a continuous analog variable.
Lifecycle and sourcing posture
Lifecycle stage on file is current per the record, with no successor MPN listed.
Where it fits in the panel
Within a control panel the XUKC1PSMM12 wires into a discrete input card or a dedicated sensor terminal block, with the supply and load wired per the XUK 50x50 pinout on the device body — the 50x50 footprint is the common mounting reference for the XUK compact photoelectric family. For calibration-style work the relevant trust signals are the sensor's own repeatability and hysteresis, not a generic accuracy figure — those numbers live on the datasheet for this exact code and should be read against the test conditions stated there before the sensor is accepted into a measurement loop.