Allen-Bradley 855TP-B24Y3Y8Y4Y7 Stack Light Assembly

Allen-Bradley 855TP-B24Y3Y8Y4Y7 Stack Light Assembly is a four-segment signaling tower that consolidates multiple status indicators into a single, compact unit for panel or machine mounting. Built for 24V operation (24V AC/DC), this pre-assembled stack light is part of the 855T Control Tower family, designed to simplify installation with standard mounting interfaces and reliable, visible signaling. The part number encodes four light modules configured in one housing, enabling distinct color signaling for sequential or simultaneous alerts; the exact color sequence is defined by the code. The assembly supports typical 10 cm pole-base or surface-base mounting options used with 855T products, offering flexible installation on control panels or machinery. Common applications include conveying-line status indicators, fault signaling, run/stop status, and process condition alerts in manufacturing settings where quick visual recognition reduces downtime and improves operator response. The unit adheres to the Rockwell/Allen-Bradley signaling platform, ensuring compatibility with other 855T accessories and modular signaling components when upgrading or expanding an existing tower light system.