Schneider Electric · Harmony XB4 Series

ZB4-BA6

Name: Schneider Electric ZB4-BA6
Brand: Schneider Electric
SKU: ZB4-BA6

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UL UL Listed — meets US safety standards. Required for NEC-inspected installations. CSA CSA Certified — meets Canadian safety standards. Required for installations in Canada. CE CE Marked — complies with EU directives (Low Voltage, Machinery, EMC).

Harmony XB4 Blue Flush Push Button Head

Part number: ZB4 Harmony XB4 — 22mm metal range - B Metal body with chrome bezel - A Flush round push button - 6 Blue actuator

Schneider Electric Harmony XB4 Series Introduced circa 2003

Schneider Electric ZB4-BA6 — Harmony XB4 Blue Flush Push Button Head

Blue flush push button head for Schneider Harmony XB4 series. 22mm cutout, IP66 rated. Used for reset and auxiliary functions.

Common Applications

Blue push button head used for non-safety auxiliary functions per IEC 60204-1 — blue indicates a mandatory action or special function. Common on CNC machines for coolant on/off, food processing lines for rinse cycle activation, and HVAC panels for damper control. In many European panel designs, blue signals a function that is neither start (green) nor stop (red) but requires operator attention. Requires a separate contact block — snap on a ZB4-BZ101 (1NO) or ZB4-BZ102 (1NC) depending on the application. The metal bezel matches the premium XB4 family aesthetic.

Specifications

Actuator Shape The physical shape of the pressable surface.	Round
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.	UL, CSA, CE
Color Button/actuator color. Green = start/go, Red = stop/emergency, Yellow = caution, Blue = reset (per IEC 60204-1).	Blue
Contact Configuration The electrical switching arrangement.	Requires separate contact block
Cutout Diameter The hole size you drill in your panel to mount this button. 22mm is the most common industrial standard worldwide.	22mm
IP Rating IP66: Dust-tight and withstands powerful water jets from any direction. Standard for outdoor and washdown applications.	IP66
Material The bezel/body material. Metal bezels are more durable in harsh environments. Plastic is lighter and cheaper.	Metal
Mechanical Life How many press cycles before mechanical failure. Higher is better — 10M cycles at 100 presses/day = 274 years.	10,000,000 cycles
Mounting Type How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.	Panel
Max Operating Temp Highest temperature the button is rated to operate in.	70°C
Min Operating Temp Lowest temperature the button is rated to operate in.	-25°C

You'll Also Need

This is a modular component. For a complete assembly, you may also need:

ZB4-BZ102 recommended

1NC contact block — for stop/safety functions

ZB4-BZ101 required

1NO contact block — for start/enable functions

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.

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.