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Description

The Allen-Bradley 855T-B24DN4 is a 70 mm Control Tower Stack Light module in the Bulletin 855T series, manufactured by Rockwell Automation. Also referenced without the dash as 855TB24DN4. Refer to manufacturer documentation to confirm compatibility with your specific application.

This module delivers a steady incandescent red indication at 24V AC/DC full voltage, drawing 271 mA (0.271 A) and consuming 7W via a BA15d base lamp rated at 7W max. The 70 mm (2-3/4 in) outer diameter black polycarbonate housing is rated IP65, NEMA Type 4, 4X, and 13, making it suitable for wash-down and dust-tight environments. Lamp life is rated at 7,000 hours under normal steady-on operation; flashing applications can reduce published lamp life by up to 50%.

This light module is designed to stack vertically on 855T series standard bases (855T-BSB, 855T-BCB) or pole-mount bases (855T-BPM10, 855T-BPM25, 855T-BPM40); the base is sold separately. All 855T light modules can absorb up to 3 mA of leakage current from solid-state outputs without unintended activation — a dry contact output is recommended to ensure full lamp-off behavior where solid-state output leakage exceeds this threshold.

Technical Specifications

Brand: Allen-Bradley (Rockwell Automation)
MPN: 855T-B24DN4
Type: Stack Light Module — Steady Incandescent
Series: Bulletin 855T, 70 mm Control Tower Stack Lights
Lens / Light Color: Red
Housing Color: Black
Operating Voltage: 24V AC/DC Full Voltage
Current Consumption: 271 mA (0.271 A)
Power Consumption: 7W
Lamp Base: BA15d
Lamp Life: 7,000 hours (steady); up to 50% reduction in flashing use
Outer Diameter: 70 mm (2-3/4 in)
Module Height: 3 in (76 mm)
IP Rating: IP65
NEMA Enclosure Rating: Type 4, 4X, 13
Acoustic Function: None
Compatible Bases: 855T-BSB, 855T-BCB (surface/conduit); 855T-BPM10, 855T-BPM25, 855T-BPM40 (pole mount)
Solid-State Output Leakage Tolerance: Up to 3 mA without module activation
Product Status: Discontinued by manufacturer (October 1, 2019); cross-reference to WERMA 641.100.00
Weight: 0.20 lbs
Country of Origin: United States

Condition: Used. This part was removed from a working production environment. Bulb function wasn't tested.

Shipping & Handling

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Returns

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About ACME MRO Solutions

We started ACME MRO Solutions to fix something we kept running into as contractors — plants down, parts slow, surplus listings you couldn't trust. Our goal is simple: get YOU the right component fast, with an honest description, so you can get back to running.

We describe what we see. Used items show signs of use; if a part has visible wear, damage, or a missing component, the condition description will say so. We don't claim anything is tested unless we tested it — and we don't bench-test parts where testing isn't practical or revealing (feed-through modules, breakers, mechanical components). When we do test something, we'll say so explicitly.

If something is our fault, we don't work through it — we make it right. We are proud to serve American manufacturing. Your uptime is our bottom line.

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Questions? Talk to us.

Send a message through eBay. During business hours we typically respond within the hour. Whether you need to confirm compatibility before buying, request additional photos, ask about a cross reference, or work through something after delivery — message first and we'll figure it out together.