The new Control Tower Stack Light offers manufacturers build-to-order flexibility and easy installation with a 30 mm diameter size designed to help boost productivity and enhance operator safety in environments with more tightly clustered production cells, such as in semiconductor fabrication. The Allen-Bradley Bulletin 855D unit offers multiple mounting options and factory-built certification to give users enhanced installation speed and wide application flexibility. It uses UL-approved wiring, which is compliant with UL 508, EN/IEC 60947-5-1 and is cUL-listed and CE-marked. Additionally, the 855D Control Tower meets UL Type 4/4X/13 and IP 65 ingress ratings, making it suitable for a broad range of industrial environments. In applications where an operator is only five to 20 feet away from a machine, many larger signaling products are too powerful for the close range and can damage an operator’s sight and hearing. When operator intervention is still necessary in the manufacturing process, small signaling products are needed. Because it is small in diameter, the unit comes with pre-assembled, pre-wired, and factory-tested components to reduce the need for OEMs and end users to complete special training or purchase unique tools. Additionally, the new stack light uses LED lights, which use less energy and last longer than incandescent bulbs. LED lights also are better-suited to withstand the harsh conditions of a plant environment due to their ability to resist shock, vibration, and heat better than incandescent bulbs. The stack light is available in a choice of six colors: green, red, amber, blue, clear, and yellow; and any combination of up to five light and sound modules. Three bases can convert voltage from 24 Vac/Wdc, 120 Vac, or 240 Vdc to power the 24 Vdc LED light and sound modules.