Allen-Bradley 855T-G24DN4 Incandescent Stack Light Module

The Allen-Bradley 855T-G24DN4 is a 70 mm control-tower stack light module with a red lens and a steady incandescent lamp, designed to provide continuous signaling in automated equipment. Part of the 855T Control Tower Stack Light family, this module can be paired with other 70 mm light modules to form multi-signal indicators in control panels, machine enclosures, and process lines. It operates on 24 V and accepts 24 V AC/DC power (full voltage), making it compatible with common industrial signaling circuits. The “DN” designation identifies a steady incandescent light module in Rockwell’s coding system, delivering a constant red signal when energized. Applications include conveying machine status such as running, stopped, or fault conditions in manufacturing, packaging, and robotics environments, where a persistent red indicator helps operators quickly assess critical conditions. With its robust 70 mm housing standard, the 855T-G24DN4 integrates into existing 70 mm tower bases and is compatible with Rockwell's Control Tower accessories, enabling straightforward installation and consistent signal visibility across equipment enclosures.