ZB4-BD2
ActiveHarmony XB4 2-Position Selector Switch Head
2-position maintained selector switch head for Schneider Harmony XB4 series. 22mm cutout, IP66. Standard handle.
Common Applications
Two-position selector switch used for mode selection: manual/auto, local/remote, on/off. Common on HVAC control panels (fan speed selection), conveyor systems (forward/reverse), and pump stations (hand/off/auto — though that needs a 3-position variant). The maintained action means it stays in the selected position, giving the operator a visual indication of the current mode. Black handle is standard; keyed variants (ZB4-BG) prevent unauthorized mode changes.
Specifications
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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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Contact Configuration
Normally Open — circuit is off until you press. Standard for start/go/enable functions.
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1NO (with ZB4-BZ101)
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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
IP66: Dust-tight and withstands powerful water jets from any direction. Standard for outdoor and washdown applications.
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IP66
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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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Mounting Type
How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.
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Panel
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Positions
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2
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Return type
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Maintained
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Specs with this icon are linked to the manufacturer's original source page
You'll Also Need
This is a modular component. For a complete assembly, you may also need:
Compatible Alternatives
These products are functionally equivalent cross-references from other manufacturers.
Installation Quick Reference
Panel cutout: 22mm. Align the selector positions with the desired panel markings before tightening.
Contact blocks: Attach one contact block per position. Wire each to a separate PLC input for position feedback. A 2-position switch needs 1-2 blocks; 3-position needs 2-3.
Dimensions
Wiring Diagram
Troubleshooting
Not responding to input
Check wiring continuity with a multimeter. Verify the contact block is properly seated. Inspect terminals for loose connections.
Where to Buy
Price range
$3.01 — $21.83
across 4 distributors
Quick Specs
- Certifications
- UL, CSA, CE
- Contact Configuration
- 1NO (with ZB4-BZ101)
- Cutout Diameter
- 22mm
- IP Rating
- IP66
- Material
- Metal
What People Are Saying
“Good selector for mode control applications. Make sure you get the right number of positions and maintained vs spring-return for your application.”
Learn More
Data Sources
Specifications and product data sourced from the following references.