| Dimensions (mm) | ||
| Round | Square | |
| Mounting diameter: | Ø22.3 | 24 x 24 |
| Mininum mounting grid: | 30 | 30 |
| Front bezel dimension: | Ø28.1 | 27 x 27 |
| Front bezel height: | 5.8 | 5.8 |
Short stroke momentary buttons. Used mostly in elevator controls. Square or round units with lighted center.