Bulletin 855 Stack Lights

Bulletin 855 Stack Lights are Allen-Bradley's family of modular visual and audible signaling devices, spanning miniature beacons, 30 mm through 70 mm control tower assemblies, industrial horns, panel lights, and hazardous-location variants — all built around a stackable, field-configurable architecture. Decoding the catalog number unlocks fast part selection: the series letter following 855 identifies the product class (D = 30 mm tower, F = 70 mm compact, H = industrial horn, XH = hazardous-location horn, and others), while subsequent positions define mounting style and pole length (e.g., GPM40 = gray housing, pole mount, 40 cm; BPM60 = black housing, pole mount, 60 cm), cable configuration (SC20 = 2 m stranded cable; blank for quick-release bases), operating voltage (24 = 24V AC/DC, 10 = 120V AC), and per-level module type and lens color (Y3 = steady green LED, L4 = flashing red LED, C1 = piezo continuous tone). The 855E sub-family dominates current in-stock inventory, with bases available in 10 cm through 80 cm pole lengths in both black and gray housings, with or without top caps. For complete wiring diagrams, module compatibility tables, and environmental ratings, see the Bulletin 855 Stack Lights Technical Data (855-TD001).