Allen-Bradley 855T-B24DN4 Light Beacon Module

Allen-Bradley 855T-B24DN4 Light Beacon Module is a 70 mm control-tower stack-light module that supplies a red, steady incandescent signal for visual machine status indication. Operating on 24V AC/DC (full voltage), this module features a black housing and a red lens, and is designed for direct insertion into Allen-Bradley 855T base assemblies to create a multi-light signaling stack on industrial equipment. As part of the 855T signaling family, the B24DN4 is intended for use where a constant-on red beacon is required—useful for stop conditions, hazard indicators, or process alarms on production lines or packaging equipment. The 24V input standardizes integration with common automation power rails, and the incandescent lamp type provides a traditional, easily visible light output. The 70 mm form factor and mounting compatibility with 855T stack-light infrastructure enable straightforward expansion of status indication across machines, conveyors, and control panels, letting operators quickly detect a single fault or overall equipment status at a glance.