A-B 856T-BA3SNC Push Button Operator Component

Allen-Bradley 856T-BA3SNC Push Button / Operator Component

 

 

The Allen-Bradley 856T-BA3SNC is actually not a push button, but a 70 mm Control Tower stack light base module used for industrial signal indication systems (alarm lights, status towers, and optional sound modules).

It is part of the Allen-Bradley 856T Control Tower signaling system, used on machines to show RUN / FAULT / WARNING / STATUS signals.

Key Specifications

• Model: 856T-BA3SNC
• Brand: Allen-Bradley (Rockwell Automation)
• Series: 856T Control Tower
• Product Type: Stack Light Base (Power + Mounting Module)
• Diameter: 70 mm
• Supply Voltage:
  • 120/240 VAC
• Circuits:
  • 3 circuits (supports up to 3 signal modules)
• Mounting:
  • 1/2 inch NPT surface mount
• Protection Rating:
  • IP66 / NEMA 4X
• Housing:
  • Black industrial polycarbonate enclosure
• Function:
  • Powers and connects stack light modules + optional sound module

What it does (simple explanation)

This module is the base of a stack light tower system:

PLC / Controller signal
↓
856T Base Module
↓
Stack light lenses (red / yellow / green) + buzzer
↓
Machine status indication

So it is used to:

• Show machine status (running, fault, standby)
• Drive stack light indicators
• Support alarm sound modules (optional)

Main Functions

• Provides power distribution to stack light segments
• Supports up to 3 signal circuits
• Enables visual + audible machine signaling
• Modular connection for light towers
• Weatherproof industrial enclosure (IP66)

Features & Advantages

• Modular stack light system (easy expansion)
• High visibility industrial signaling
• Supports LED light modules and sound modules
• Rugged IP66/NEMA 4X design for harsh environments
• Easy installation on machines and control panels
• Compatible with multiple 856T light segments

Applications

• Industrial machine status indication
• Factory production lines
• Conveyor systems
• CNC and automation machines
• Alarm / warning signaling systems
• Equipment fault indication towers