Schneider Electric · Harmony XB4 Series

ZB4-BW343

Name: Schneider Electric ZB4-BW343
Brand: Schneider Electric
SKU: ZB4-BW343

Active

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 Illuminated Red Push Button 24V LED

Part number: ZB4 Harmony XB4 — 22mm metal range - B Metal body with chrome bezel - W Illuminated push button - 3 Green illuminated - 43 230-240V AC LED

Schneider Electric Harmony XB4 Series Introduced circa 2003

Schneider Electric ZB4-BW343 — Harmony XB4 Illuminated Red Push Button 24V LED

Illuminated red flush push button with integrated 24V LED for Schneider Harmony XB4 series. 22mm cutout, IP66 rated. Visual confirmation of stop/fault state.

Common Applications

Illuminated red push button that lights up to confirm the machine is stopped or a fault is present. The red LED provides clear visual status — lit means the stop circuit is active or an alarm condition exists. Common on packaging lines, conveyor systems, and CNC machine auxiliary panels where operators need immediate confirmation that the stop command was received. Pairs with the green illuminated ZB4-BW333 for a matched start/stop set. Uses a 1NC contact with ZB4-BZ102 block, so the circuit breaks on press — standard fail-safe wiring for stop functions.

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).	Red
Contact Configuration Normally Closed — circuit is on until you press. Standard for stop/emergency functions. Wire in series with safety circuits.	1NC (with ZB4-BZ102)
Cutout Diameter The hole size you drill in your panel to mount this button. 22mm is the most common industrial standard worldwide.	22mm
Illuminated	Yes
IP Rating IP66: Dust-tight and withstands powerful water jets from any direction. Standard for outdoor and washdown applications.	IP66
LED Color Color of the built-in LED indicator light.	Red
LED Voltage The voltage required for the built-in LED. Must match your control circuit voltage (typically 24V DC or 230V AC).	24V AC/DC
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

Compatible Alternatives

These products are functionally equivalent cross-references from other manufacturers.

Eaton

M22-DL-R

M22 Illuminated Red Flush Push Button 24V

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.