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The modular Harmony XB4 range of 22 mm metal control and signaling units combines simplicity of installation, efficiency, modern design, flexibility, and robustness to meet most industrial applications.
| Bezel material | Chromium plated metal |
| Mounting diameter | 22mm |
| Head type | Standard |
| Shape of signaling unit head | Round |
| Type of operator | Spring return |
| Operator profile | Green flush |
| Operator additional information | With plain lens |
| Contacts type and composition | 1 NO + 1 NC |
| Light source | Universal LED |
| Bulb base | BA 9s |
| Light block supply | Via integral transformer 1.2 VA 6 V |
| [Us] rated supply voltage | 110...120 V AC at 50/60 Hz |