Allen-Bradley 855T-B10YL4 Red Stack Light Assembly

Allen-Bradley 855T-B10YL4 Red Stack Light Assembly is a 70 mm control-tower light module from Rockwell Automation's 855T signaling family, designed to mount in industrial control panels or machine housings to provide immediate, at-a-glance status indication across manufacturing lines. The red lens (color code 4) identifies a critical or stop-state signal and is intended to be used alongside other color modules to form a multi-color indicator tower that conveys multiple conditions in a single stack. As part of a modular signaling system, this assembly shares the same mounting footprint and electrical interface as other 70 mm 855T light modules, enabling straightforward integration with existing Rockwell automation hardware for signaling tasks in environments such as assembly, packaging, and process lines. The 855T family provides a modular signaling platform with standardized mounting and interconnection options, allowing configuration of color, light type, and stacking order to match specific control-system needs.