Allen-Bradley 855H-BD30DD Programmable Logic Controller Module

The Allen-Bradley 855H-BD30DD is an industrial electronic horn from the 855H signaling family, designed for loud, deterministic audible alerts on control panels, machines, and safety enclosures. It operates on 10–30 V DC and draws about 200 mA, making it suitable for DC-powered signaling in harsh industrial environments. With 45 selectable tones, it delivers 119 dB(A) at 1 meter (112 dB(A) for the All-Tones configuration), enabling you to tailor alarms to distinct situations while preserving audible clarity around noise-heavy equipment. Ideal for motor-start signals, fault notifications, and general process signaling, this model fits a range of frame sizes and voltage options within the 855H horn lineup to match different panel sizes and wiring schemes.