8WD4420-5AB
Active8WD44 Signal Column Green/Red/Yellow
Siemens 8WD44 modular signal column.
Common Applications
Siemens stack light for machine status indication. Modular — stack the colors you need. LED technology, 70mm diameter. Visible from 30+ meters in a factory. Integrates with Siemens S7 PLC via direct digital outputs.
Specifications
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Certifications
Third-party safety certifications. UL = required for US NEC installations. CE = EU compliance. CSA = Canadian standards.
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UL, CE
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Color
Button/actuator color. Green = start/go, Red = stop/emergency, Yellow = caution, Blue = reset (per IEC 60204-1).
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Green/Red/Yellow (modular)
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Mounting Type
How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.
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Pole mount
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Voltage
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24V DC
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Installation Quick Reference
Panel cutout: 22mm. Insert from the front, secure with mounting nut.
LED module: Check the voltage rating matches your supply (typically 24V DC or 230V AC). Connect to PLC digital output or relay contact for status indication.
Color meaning (IEC 60204-1): Green = normal/running. Red = fault/danger. Yellow = warning/caution. Blue = mandatory action. White = neutral/general.
Dimensions
Troubleshooting
Light is dim or flickering
Check supply voltage matches the LED module rating. Low voltage causes dimming. If voltage is correct, the LED module is failing — replace it. LED modules have finite life (typically 50K-100K hours).
Light doesn't turn on
Verify voltage at the terminals with a multimeter. Check the PLC output or relay driving the light. LED modules are polarity-sensitive on DC circuits — try reversing the leads.
Where to Buy
Price range
$52.03 — $86.21
across 2 distributors
Quick Specs
- Certifications
- UL, CE
- Color
- Green/Red/Yellow (modular)
- Mounting Type
- Pole mount
- Voltage
- 24V DC
What People Are Saying
“Siemens stack light for machine status indication. Modular — stack the colors you need. LED technology, 70mm diameter. Visible from 30+ meters in a factory. Integrates with Siemens S7 PLC via direct d”
