The Square D / Telemecanique XUFN12301 is a fiber optic light guide — a passive cable assembly that routes light from a photoelectric sensor emitter/receiver to a remote sensing point. It is a through-beam type, meaning the fiber pair breaks the beam when an object interrupts the light path between the two ends. Rated sensing distance is 9.84 inches (250 mm), which is the maximum gap between the fiber tips for reliable detection. The 0.04 inch diameter fiber core limits the light throughput, so this is a short-range through-beam — suitable for small-part detection, edge sensing, or presence checking in tight spaces where a standard photoelectric head won't fit. The cable length is 6.6 ft (2 m), which is the standard reach from the sensor body to the sensing tip. The polyethylene jacket and 1 inch minimum bending radius mean it can be routed through cable carriers or around panel edges without kinking, as long as the bend stays above that radius.
This fiber optic light guide is designed for use with a photoelectric sensor (the emitter/detector unit). The mounting end is standard (non-threaded), and the sensing tip is threaded — so the tip screws into a mounting bracket or machine frame, while the sensor end plugs into the amplifier. The straight tip viewing means the light exits axially, not at an angle. The polyethylene jacket is not rated for chemical splash or UV exposure — keep it inside the panel or in a dry, sheltered location.