Allen-Bradley 855H-BD30DD Industrial Alarm Horn

The Allen-Bradley 855H-BD30DD Industrial Horn is a rugged, DC-powered audible signaling device for industrial environments. It operates on 10-30 VDC and delivers 119 dB of sound with 45 selectable tones, enabling distinct alarms or status signals in noisy facilities. Housed in gray with a standard base, it is designed for surface mounting and supports back-feed or conduit-feed wiring for flexible installation. This model is part of Rockwell Automation's 855H signaling family and is suitable for panel- or machine-mounted signaling to alert operators to faults, safety interlocks, or process alarms across manufacturing lines, conveyors, and control panels. The 10-30 VDC input and multi-tone capability support differentiation of conditions within a single unit, and the 3-stage signaling allows varying alarm levels across tones. Its compact form factor and robust construction suit demanding industrial environments, making it a straightforward addition to an existing control circuit where an audible alert is required.