L21AA03
在产BACO 22mm Black Flush Push Button 1NO (chrome bezel)
BACO L21 22mm green push button — German value alternative.
常见应用
BACO is the European budget industrial button brand. Same 22mm mounting standard as Schneider/Eaton. Lower cost, acceptable quality for indoor panels. Popular with German machine builders who want to save on operator interface without compromising on mounting compatibility.
兼容性
Standard 22mm panel cutout. BACO contact blocks are proprietary — not cross-compatible with Schneider ZB4 or Eaton M22 contact blocks. However, the panel cutout is the same so you can replace the entire assembly with any 22mm brand.
规格参数
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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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Black
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Contact Configuration
Normally Open — circuit is off until you press. Standard for start/go/enable functions.
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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 Green->Black per distributor data (OnlineComponents/Baco catalog: L21AA03 = 22mm black flush momentary, chrome bezel).
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安装快速参考
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.
尺寸
接线图
故障排除
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.
快速规格
- Actuator Type
- Flush
- Certifications
- CE
- Color
- Black
- Contact Configuration
- 1NO
- Cutout Diameter
- 22mm
用户评价
“BACO is the European budget industrial button brand. Same 22mm mounting standard as Schneider/Eaton. Lower cost, acceptable quality for indoor panels. Popular with German machine builders who want to ”