Allen-Bradley 855E-24FN4 Stack Light

The Allen-Bradley 855E-24FN4 is a 50 mm red control-tower stack light designed for direct 24 V AC/DC operation, providing full-voltage signaling without requiring a separate power module. It uses a flashing incandescent light module with a red lens and is listed in Rockwell Automation's 855E family as a 50 mm light module, Red, 24V AC/DC Full Voltage. The unit is actively supported in Rockwell's lineup and weighs about 0.95 lb, suited for mounting in standard 50 mm stack-light assemblies on panels and machines. Suitable for signaling machine status in industrial environments, the 855E-24FN4 delivers immediate visual indication of states such as fault, warning, or run, helping operators quickly assess equipment conditions on production lines and automated systems.