XB2-BA31
ActiveXB2 22mm Green Flush Push Button 1NO
Telemecanique XB2 green push button — the predecessor to Schneider Harmony XB4.
Common Applications
If you are maintaining equipment built before 2003 with Telemecanique controls, this is the start button. The XB2 was replaced by the XB4 (Harmony) range. Direct replacement: Schneider ZB4-BA3 (same 22mm mounting, upgraded design). Telemecanique buttons are still available as spare parts but specifying them on new builds is not recommended.
Compatibility
Legacy part. Direct replacement: Schneider ZB4-BA3 (Harmony XB4). Same 22mm panel cutout. Schneider XB4/XB5 contact blocks fit the XB2 mounting base. For exact cosmetic match, Schneider still sells XB2 replacement parts but recommends upgrading to XB4.
Repair & Maintenance
If the button head is worn but the contact block works, replace just the head. XB4 heads drop into XB2 mounting bases with the same snap-fit mechanism.
Specifications
|
Actuator Type
The button head style. Flush sits level with the bezel (prevents accidental presses). Extended protrudes for easy access.
|
Flush
|
|
Certifications
Third-party safety certifications. UL = required for US NEC installations. CE = EU compliance. CSA = Canadian standards.
|
CE
|
|
Color
Button/actuator color. Green = start/go, Red = stop/emergency, Yellow = caution, Blue = reset (per IEC 60204-1).
|
Green
|
|
Contact Configuration
Normally Open — circuit is off until you press. Standard for start/go/enable functions.
|
1NO
|
|
Cutout Diameter
The hole size you drill in your panel to mount this button. 22mm is the most common industrial standard worldwide.
|
22mm
|
|
Material
The bezel/body material. Metal bezels are more durable in harsh environments. Plastic is lighter and cheaper.
|
Metal
|
|
Status
|
Legacy — replaced by XB4
|
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
$55.58 — $69.28
across 2 distributors
Quick Specs
- Actuator Type
- Flush
- Certifications
- CE
- Color
- Green
- Contact Configuration
- 1NO
- Cutout Diameter
- 22mm
What People Are Saying
“If you are maintaining equipment built before 2003 with Telemecanique controls, this is the start button. The XB2 was replaced by the XB4 (Harmony) range. Direct replacement: Schneider ZB4-BA3 (same 2”