Can a 22 mm Harmony pushbutton be mounted in a 30 mm hole?
1. What you need to know
Yes. Schneider Electric offers five adapters (reducers) that let any standard Ø22 mm XB4 or XB5 device be fitted in a 30 mm panel cut-out: ZB4BZ012 for standard mounting, and ZB4BZ021 / ZB4BZ022 / ZB5AZ021 / ZB5AZ022 for flush mounting. Another option avoids adapters altogether — the XB4 and XB5 flush ranges are designed for 30 mm mounting holes as standard.
2. Choosing the right solution
All options suit a 30 mm cut-out, whether you are retrofitting an existing panel or standardizing a new one. The choice depends on the device type and on the finish you want.
- The adapters work with the complete Ø22 device — head plus body and contact sub-assembly. Only the panel mounting dimensions are differents.
ZB4BZ021 mounting specifications
ZB5AZ021 mounting specifications
- ZB4BZ021 / ZB4BZ022 / ZB5AZ021 / ZB5AZ022 differ by operator type, not by range.
- Adapters apply to both the XB4 metal and XB5 plastic ranges.
- For new panels, the flush range removes the need for any mounting kit.
3. Installation solutions
| Solution | Result in a 30 mm cut-out | Suitable for |
|---|---|---|
| Standard adapter | Ø22 device mounted with its standard bezel | Any standard XB4 / XB5 device |
| Flush adapter, type 1 | Device mounted flush with the bezel | Pushbuttons and pilot lights |
| Flush adapter, type 2 | Device mounted flush with the bezel | Selector switches and illuminated pushbuttons |
| Flush range XB4 / XB5 | Native 30 mm mounting, no adapter needed | New panels and standardised designs |
4. Schneider Electric references
| Function | Reference | Description |
|---|---|---|
| Flush adapter | ZB4BZ021 | Metal flush mounting in a 30 mm cut-out, for pushbuttons and pilot lights |
| Flush adapter | ZB4BZ022 | Metal flush mounting in a 30 mm cut-out, for selector switches and illuminated pushbuttons |
| Flush adapter | ZB5AZ021 | Plastic flush mounting in a 30 mm cut-out, for pushbuttons and pilot lights |
| Flush adapter | ZB5AZ022 | Plastic flush mounting in a 30 mm cut-out, for selector switches and illuminated pushbuttons |
| Head, metal | ZB4BA3 | Ø22 flush pushbutton head, green — example of a compatible device |
Launch Product Selector on se.com to configure a Harmony pushbutton according to your requirements or contact Schneider Electric Technical Support to check a configuration against your control scheme.