Allen-Bradley 855TC-B10L4A1 Stack Light Assembly

Allen-Bradley 855TC-B10L4A1 is a red Control Tower Stack Light assembly from Rockwell Automation, part of the Bulletin 855T stack-light family used for visible status signaling on automation equipment. This 10 cm-tall stack light is designed to be combined with additional light modules to form a multi-module stack, and Rockwell’s technical data confirms that up to four light modules can be accommodated with the top position reserved for a light or sound module. In official product listings, the 855TC-B10L4A1 is described as a configured Stack Light Signaling Device in the Rockwell portfolio, and it can be supplied as pre-assembled or as separate light and sound modules to tailor the signaling configuration. Distributors such as Radwell and Platt Electric list 855TC-B10L4A1 as an Allen-Bradley control-tower stack-light option, confirming its status as a recognized replacement part within the Control Tower family.