Heavy-duty limit switch — panel fit and field reality
The XCMD3910L2 is a Telemecanique-branded limit switch from Schneider Electric, classified under the General/Heavy Duty sub-category — meaning it's built for the mechanical overtravel and environmental exposure you'd expect on a conveyor line or machine tool guard door, not a light-duty position sensor. The UPC 389119034725 is the 12-digit barcode on the retail packaging — useful for warehouse receiving verification if you're matching against a PO line item rather than the engraved nameplate.
Sourcing — active line, quoted per BOM
For a maintenance spares purchaser: the General/Heavy Duty sub-category means this switch fits standard limit-switch mounting footprints and actuator options in the Telemecanique XCMD family — no special adapter plates or wiring changes needed when swapping a like-for-like unit.