Allen-Bradley 855T-B24TL8 LED Stack Light 70mm

Allen-Bradley 855T-B24TL8 is a 70 mm control tower stack light module with a yellow lens and black housing, designed for 24 V AC/DC operation (±10%) in industrial signaling applications. This steady LED module provides continuous illumination with a lamp life rating of up to 100,000 hours and a light output of 900–1800 millicandelas, drawing 29 mA at 24 V. The unit features a 70 mm outer diameter, IP65 and NEMA 4X protection, making it suitable for panel mounting in harsh environments. Construction uses polycarbonate for the surface and vertical-mount pole connection box and magnetic mount housing; it supports a recommended wire size of 0.5 mm² and a terminal torque of 0.8 Nm. Operating temperature is listed at -25 °C with storage down to -40 °C. This specific model was discontinued as of October 1, 2019, with Rockwell Automation recommending the 856T-BT8 as a functional replacement. In practice, the yellow 70 mm stack light serves as a clear status indicator in automated control systems, whether mounted singly or as part of a multi-stack signaling assembly in process or machine control environments.