Allen-Bradley 855T-B10DN6 Plug-In Time Delay Relay

The Allen-Bradley 855T-B10DN6 is a 70 mm control tower stack light module from the 855T signaling family, delivering a blue, steady-incandescent indication when powered at 120 VAC to provide a clear, constant status signal on industrial equipment panels. It is designed to mount with Allen-Bradley 70 mm base assemblies to form a multi-color stack light, allowing operators to quickly interpret machine state at a distance on assembly lines, packaging lines, or other PLC-controlled processes. Key verified specifications include a 70 mm housing diameter, blue lens/color, incandescent light source, and an input voltage rating of 120 VAC, making it compatible with standard signaling configurations in industrial control panels. Used as a dedicated status indicator within control towers, the 855T-B10DN6 supports straightforward signaling conventions and is commonly employed where a blue, constant-on signal is required to convey information or fault levels according to the control scheme.