Which knockout punch size should be used to make a 22 mm push button hole for Harmony operator dialog device ?
1. What you need to know
Use a 22.5 mm (0.885 in) knockout punch. For Harmony XB4/XB5, Ø22 mm pushbutton head, the recommended panel cut-out is Ø22.3 to Ø22.7 mm, with a nominal target of 22.3 mm + 0.4 mm the " 22 mm" in the product name is the nominal size, not the hole to punch.
Recommended tool:
- Greenlee - 71BB
- Greenlee - KP-PB22 (includes the anti-rotation notch)
2. Key points
- Acceptable hole range: panel cut-out is Ø22.3 to Ø22.7 mm.
A 22 mm punch is too small for the head to pass through.
- Ø22.7 is the upper limit - check whether a worn punch has not oversized the hole.
- For XB5 / ZB5 plastic heads, the anti-rotation notch is optional because the orientation pin on the collar can be broken off if no notch is provided.
- The same Ø22.5 mm size is the standard 1/2-inch conduit knockout.
3. Schneider Electric references
| Function | Reference | Description |
|---|---|---|
| Head - Plastic | ZB5AA3 | Ø22 flush head, green, spring return. Cut-out Ø22.3 mm + 0.4. |
| Head - Metal | ZB4BA3 | Metal-bezel equivalent, same cut-out. |
| Mounting collar - Plastic | ZB5AZ009 | Plastic collar with breakaway orientation pin. |
| Mounting collar - Metal | ZB4BZ009 | Metal collar with grounding screw. |
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.