Allen-Bradley 855T-B24FN8 Flashing Yellow Light Module

The Allen-Bradley 855T-B24FN8 Stack Light Module is a 24V AC/DC, full-voltage flashing incandescent light with a yellow lens, designed to be installed in the 855T control-tower signaling family. The FN designation identifies this unit as a flashing incandescent light module, and the 24V AC/DC full-voltage code means it can be powered directly from standard industrial 24-volt supplies for straightforward integration into control panels. As a visual status indicator in industrial automation, it provides conspicuous flashing illumination within a stack-light assembly, enabling operators to quickly interpret machine states or process signals from across the shop floor. The 855T-B24FN8 variant combines yellow lens color with flashing incandescent illumination, aligning with Rockwell's signaling taxonomy for 855T and supporting reliable visual cues in rugged industrial environments.