| Feature | Siemens 8DN9 | SF₆ GIS (e.g., 8DA/B series) | Air-insulated switchgear | |--------|--------------|-------------------------------|--------------------------| | GWP | 0 | ~23,500 (SF₆) | 0 | | Footprint | Small | Small | Large | | Maintenance | Very low | Very low | Medium (air-break) | | Indoor/outdoor | Indoor (IP4X) | Indoor/outdoor | Both | | Regulation risk | None | High (future bans) | None | | Cost | Higher upfront than AIS | Moderate | Low |
Uses single-phase encapsulation for feeders and three-phase for busbars to minimize space requirements. Insulation & Quenching: Uses Sulphur hexafluoride ( SF6cap S cap F sub 6 ) as the insulating and arc-quenching medium. siemens 8dn9