L21AA04
ActiveBACO 22mm Yellow Flush Push Button (chrome bezel)
BACO L21 red push button.
Common Applications
Budget red stop button. Same 22mm standard.
Specifications
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Actuator Type
The button head style. Flush sits level with the bezel (prevents accidental presses). Extended protrudes for easy access.
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Flush
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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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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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Yellow
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Contact Configuration
1NO + 1NC: One circuit closes and one opens when pressed. Common for start buttons that also signal 'running' state.
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1NC (VERIFY — atypical for a yellow momentary; usually 1NO)
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Cutout Diameter
The hole size you drill in your panel to mount this button. 22mm is the most common industrial standard worldwide.
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22mm
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IP Rating
IP65: Dust-tight and protected against low-pressure water jets. Suitable for indoor industrial and light washdown.
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IP65
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Material
The bezel/body material. Metal bezels are more durable in harsh environments. Plastic is lighter and cheaper.
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Chrome (metal) bezel
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Pn note
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Color corrected Red->Yellow per distributor data (L21AA04 = 22mm yellow flush momentary chrome bezel). BACO L21AAxx color codes were mis-decoded in catalog (AA03=black not green, AA04=yellow not red). Contact config also suspect — verify from datasheet.
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Pn status
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color-corrected
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Installation Quick Reference
Panel cutout: 22mm. Insert from the front of the panel, secure with mounting nut from behind (tighten to 2-3 Nm).
Contact block: Snap or screw the contact block onto the rear of the button body. Ensure the contact block orientation matches the wiring diagram — NO terminals are usually marked.
Wiring: Use 0.5-2.5mm² stranded wire with ferrules. Tighten screw terminals to 0.8 Nm. Test the button function before energizing the circuit.
Dimensions
Wiring Diagram
Troubleshooting
Button doesn't respond when pressed
Check the contact block first — it's the most common failure point. Test continuity across the NO or NC terminals with a multimeter. If no click is felt, the return spring in the head may be broken.
Works intermittently
Contact block contacts are pitted or burned. Replace the contact block — don't try to file the contacts. Check if the rated cycle count has been exceeded.
Button feels mushy or doesn't click
The spring return mechanism in the button head is worn. Replace the head. The contact block can usually be reused if it tests OK.
Where to Buy
Price range
$44.52 — $87.46
across 2 distributors
Quick Specs
- Actuator Type
- Flush
- Certifications
- CE
- Color
- Yellow
- Contact Configuration
- 1NC (VERIFY — atypical for a yellow momentary; usually 1NO)
- Cutout Diameter
- 22mm
What People Are Saying
“Budget red stop button. Same 22mm standard.”