XB4BA21
Active22mm Black Complete Push Button 1NO
Schneider XB4BA21 — complete black push button.
Common Applications
Complete black button for auxiliary functions. Horn silence, counter reset, lamp test. Black has no IEC safety meaning — keeps colored buttons visually distinct.
Research Notes
1. Overview
The XB4BA21 belongs to Schneider Electric's Harmony XB4 range of 22mm chromed-metal industrial pushbuttons — successor to the legacy Telemecanique metal pushbutton line still seen in older panel drawings. It's a complete, flush-mounted, spring-return (momentary) unit: head, body, and contact block preassembled as one part number. This SKU is the black, unmarked, 1NO variant, one of six standard body colors in the XB4BA family (white/black/green/red/yellow/blue) sharing the same Zamak metal fixing collar.
2. User Sentiment
No color-specific discussion exists for the XB4BA21 — it's a commodity part ordered by case count, not reviewed individually. Platform-level sentiment (applying equally to every color/contact combo) is positive on build quality — solid metal bezel, tight tactile feel, long service life — with occasional grumbling about price versus lower-cost metal-look clones.
3. Real-World Applications
Black flush pushbuttons are a default choice for "neutral" functions outside the red=stop/green=start convention — general momentary commands, reset/auxiliary functions, mode-select pulses, and unmarked positions for custom legend plates. Common in machine-tool panels, conveyor/packaging operator stations, and OEM equipment across factory automation.
4. Technical Specifications
- Type: 22mm complete flush spring-return (momentary) pushbutton, metal bezel
- Color: Black
- Contact: 1NO (single normally-open, unmarked cap)
- IP rating: IP66/IP67/IP69K
- Certifications: UL508, CSA C22.2, CE (plus IEC 60947-5-1, CCC/EAC)
- Electrical rating: up to 10A/600V AC per element; ~1,000,000 op. durability
- Operating temperature: typically −25°C to +70°C
- Mounting: 22.5mm panel cutout, screw-clamp terminals
5. Ordering & Compatibility
Complete unit — no separate contact block purchase needed (rebuild option: head + ZBE-101 1NO block). Color siblings: XB4BA11 (white/1NO), XB4BA31 (green/1NO), XB4BA42 (red/1NC), XB4BA55 (yellow/1NO+1NC), XB4BA61 (blue/1NO); XB4BA25 is the 1NO+1NC black variant. Plastic-bezel Harmony XB5 (e.g. XB5AA21) is the equivalent successor line.
6. Known Issues
No significant issues reported. Occasional distributor lead-time variability noted industry-wide, not specific to this color/contact combo.
5 sources
- XB4BA21 - Harmony, 22mm push button, black flush, spring return, 1 NO, unmarked — se.com
- Schneider Electric XB4BA21 Pushbutton Switch, SPST, Black, 22mm, Flush, Spring, 1 NO, Harmony XB4 Series — RS Online
- Schneider Electric XB4BA11 Metal Push Button White NO Contact (sibling spec table used for IP rating) — Tameson
- Schneider Electric XB4BA21 Push Button Switch for Industrial Machinery — Amazon
- Square D (Schneider Electric) XB4BA21 Harmony, 22mm Push Button, Black Flush, Spring Return, 1 NO, Unmarked — Graybar
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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UL, CSA, 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
IP69K: Dust-tight and withstands high-pressure, high-temperature steam jets. Built for food processing washdown environments.
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IP66/IP67/IP69K
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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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Metal
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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
$19.99 — $129.92
across 4 distributors
Quick Specs
- Actuator Type
- Flush
- Certifications
- UL, CSA, CE
- Color
- Black
- Contact Configuration
- 1NO
- Cutout Diameter
- 22mm
What People Are Saying
“Complete black button for auxiliary functions. Horn silence, counter reset, lamp test. Black has no IEC safety meaning — keeps colored buttons visually distinct.”
