Allen-Bradley 855T-B10FN8 Flashing Lamp Incandescent

The Allen-Bradley 855T-B10FN8 is a flashing incandescent lamp module that integrates with the 855T Control Tower Stack Light system to provide rapid visual signaling for industrial equipment. Featuring a Black housing and a Yellow lens, this 120 V AC full‑voltage module is designed to be mounted in compatible 855T bases to form a multi‑lamp indicator stack used for status indication, alarms, and process signals in industrial environments. The code breakdown is B for Black housing, 10 for 120 V AC, FN for flashing incandescent, and 8 for Yellow lens, ensuring correct compatibility within Rockwell’s signaling family. Documentation notes that flashing incandescent modules operate at characteristic frequencies, with typical rates around 2 Hz for 120 V and higher voltage variants, while 12 V versions run closer to 1.5 Hz, enabling clear, rapid on/off signaling without excessive wear on components. This module is commonly employed in control panels and automation environments where a conspicuous, fast‑flashing indicator is needed to quickly convey machine status or alerts.