Medium Duty — what that means on a line
The XCKD2539P16 is classified as a Medium Duty Limit Switch under the Square D Sensors & Safety brand, part of Schneider Electric's Telemecanique family. Medium duty here means it's built for the mechanical cycling and environmental exposure you'd expect on a packaging conveyor, material-handling turntable, or light assembly station — not a heavy stamping press, but not a light-touch microswitch either.
UPC and sourcing details
The UPC 12 Digit is 389110201621 — that's the retail scanning code, useful for cross-referencing against inventory systems that track by UPC rather than the manufacturer part number.