These are the standard ratings for the 8DN9 series (always verify specific nameplate data for your unit):
| Feature | Specification | | :--- | :--- | | Rated Voltage | Up to 36 kV (Typically 12 kV, 24 kV, 36 kV) | | Rated Current (Busbar) | Up to 2500 A (depending on configuration) | | Rated Current (Feeder) | Up to 2500 A | | Rated Short-Circuit Breaking Current | Up to 31.5 kA | | Insulation Medium | SF6 (Sulfur Hexafluoride) | | Enclosure Material | Stainless Steel / Aluminum | | Degree of Protection | IP54 to IP65 (for the gas tank); usually IP4X for the panel | | Standards | IEC 62271-200, IEEE C37.20.3 | siemens 8dn9
| Feature | Specification | |--------|----------------| | Manufacturer | Siemens AG (now Siemens Energy) | | Type | Gas-insulated medium-voltage switchgear | | Voltage range | Up to 24 kV (12 kV / 17.5 kV / 24 kV) | | Rated current | Up to 630 A (busbar and feeder) | | Rated short-circuit breaking current | Up to 25 kA | | Insulation medium | "Clean Air" – mixture of natural gases (mainly synthetic air; no SF₆) | | Switching technology | Vacuum interrupter | | Standards | IEC 62271-200, IEC 62271-100, VDE 0670 | | Protection class | IP3X (indoor) / IP5X (on request) | These are the standard ratings for the 8DN9
Pragmatic view: While the industry transitions, an 8DN9 with proper maintenance leaks less SF₆ in 30 years than a single truck tire deflates in air—but the gas is potent. Operators must commit to responsible handling. siemens 8dn9