Signal contacts SK1 for general triggered messages with different contact assignments are installed on the right side of the main devices
| Property | Value |
| Number of contacts as normally open: | 2 |
| Mounting type: | Side mounting |
| Type of electrical connection: | Screw connection |
| Design: | plug-in |
| Rated operating current Ie at AC-15, 230 V: | 4 A |
| Number of fault signal switches: | 1 |
| Socket: | without |
