Allen-Bradley 854K-00XN4 Stack Light Assembly

The Allen-Bradley 854K-00XN4 Stack Light Assembly is a 60 mm Control Tower Stack Light light module from the 854J/854K family, designed to provide clear, constant process-status indication on automation equipment. This variant operates on 24 V AC/DC and uses steady LED illumination to convey a continuous signal, with green as the active color for normal or go conditions. It is intended to be used as part of a modular stack light tower, allowing multiple colored modules to be combined in a single assembly to indicate different statuses at a glance. Typical applications include signaling machine readiness or run status on production lines, fault or warning conditions in manufacturing cells, and other live-to-operator indicators in industrial environments. The 60 mm form factor aligns with standard mounting bases in Rockwell Automation’s Control Tower Stack Lights, enabling straightforward field assembly with compatible light and sound modules. When deployed in a multi-color tower, this green LED module helps operators quickly discern state changes from a distance, contributing to faster response times and improved line visibility in busy industrial floors.