Allen-Bradley 855-B10FN4 Red Lens Stack Light

Allen-Bradley 855-B10FN4 Red Lens Stack Light is a black-housing Control Tower Stack Light module designed for 120 V AC full-voltage signaling; the FN4 designation identifies a flashing incandescent lamp module, and the red lens corresponds to signaling color 4. As part of the Control Tower family, this 855-B10FN4 is intended for mounting in a compatible base on industrial equipment to provide a visible flashing red indicator. Typical applications include signaling machine status, faults, alarms, and process events on manufacturing lines in packaging and automation environments, with the 120 V AC operation matching standard control panels and the black housing aiding integration into panel layouts.