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 |
The 8DN9 may be a legacy platform, but it is fully compatible with modern digital substation automation. Siemens offers a digital retrofit package including:
This transforms the 8DN9 into a digitally native GIS with:
Utilities can thus extend the life of their 8DN9 fleet while unlocking smart grid functionality. siemens 8dn9
The 8DN9 thrives where AIS fails:
For engineers evaluating the 8DN9, here are the critical parameters (general range – confirm exact values for your voltage level):
| Parameter | Typical Value (8DN9) | |-----------|------------------------| | Rated voltage (Ur) | 12 kV – 36 kV (up to 40.5 kV) | | Rated power frequency withstand voltage | 28 kV – 70 kV (depending on Ur) | | Rated lightning impulse voltage (Up) | 75 kV – 170 kV | | Rated normal current (busbar) | Up to 2500 A | | Rated normal current (feeder) | Up to 1250 A – 2500 A | | Rated short-circuit breaking current | 20 kA – 40 kA | | Rated short-circuit making capacity | 50 kA – 104 kA (peak) | | Short-time withstand current (1 s / 3 s) | Up to 40 kA | | Internal arc classification | IAC A FLR 31.5 kA / 1 s | | SF₆ gas pressure (relative) | 0.3 – 1.4 bar (depending on component) | | Panel width | 500 mm – 800 mm (typical 600 mm for 24 kV) | | Mechanical endurance (breaker) | 10,000 – 30,000 operations | | Protection class | IP4X for enclosure; IP6X for sealed gas compartments |
Note: Always refer to the Siemens primary engineering catalog for project-specific ratings. These are the standard ratings for the 8DN9
Siemens 8DN9 high-voltage, gas-insulated switchgear (GIS) system designed for space-efficient and reliable power distribution in networks up to
. It is widely used in urban centers, industrial plants, and offshore applications due to its compact, modular design and ability to operate under extreme environmental conditions. PromArchive Key Technical Specifications
The 8DN9 is engineered for high performance with the following standard ratings: Rated Voltage : Up to 245 kV (offshore versions available up to 300 kV). Rated Normal Current : Up to 4,000 A for busbars and feeders. Short-Circuit Breaking Current : Up to 50 kA. Operating Temperatures : Reliable performance from -25°C to +55°C. Service Life
: Expected lifetime exceeding 50 years, with the first major inspection typically required only after 25 years. Core Features & Benefits Primary switchgear / gas-insulated - max. 245 kV | 8DN9 This transforms the 8DN9 into a digitally native GIS with:
A typical 10-panel 8DN9 installation can be fully commissioned in 14 working days by a trained Siemens service team.
The most striking feature of the Siemens 8DN9 is its ultra-compact footprint. An AIS substation at 145 kV may require a land area of 10,000 m², whereas an equivalent 8DN9 GIS installation fits into less than 500 m².
The Siemens 8DN9 designation refers to a family of low-voltage power circuit breakers used for protection and switching in industrial and commercial distribution systems. These breakers are designed for reliable overcurrent protection (short-circuit, overload), selective coordination with upstream/downstream devices, and safe manual or motorized operation. Common applications include switchboards, motor control centers, distribution panels, and generator or utility interfaces.