Siemens: 8dn9

If your project requires medium-voltage switchgear for a critical application with limited access, high pollution, or extreme space constraints, the Siemens 8DN9 should be at the very top of your evaluation list. Work with an authorized Siemens partner to confirm the exact voltage, current, and arc ratings—and ensure SF₆ handling meets your local environmental regulations. Disclaimer: This article is for informational purposes. Always consult Siemens official technical documentation and certified engineers for project-specific design and safety requirements.

| Feature | Siemens 8DN9 | ABB ZX2 (now Hitachi Energy) | Schneider Electric GHA | Eaton Power Xpert XGIS | |---------|--------------|------------------------------|------------------------|------------------------| | Max voltage | Up to 36 kV | Up to 36 kV | Up to 36 kV | Up to 38 kV | | Common pressure system | Yes (optional) | Yes (modular) | No (sealed compartments) | No | | Magnetic actuator option | Yes | Yes (VM1) | No | No | | Arc fault rating | 31.5 kA / 1s | 40 kA / 1s | 31.5 kA / 1s | 25 kA / 1s | | Footprint (24 kV feeder) | ~600 mm | ~550 mm | ~650 mm | ~750 mm | | Global installed base | >200,000 panels | >150,000 panels | Moderate | Smaller | siemens 8dn9

| 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 | If your project requires medium-voltage switchgear for a

In the complex world of power distribution, reliability is not just a feature—it is a necessity. For critical infrastructure, offshore platforms, renewable energy hubs, and metropolitan substations, the choice of switchgear can mean the difference between uninterrupted power and catastrophic downtime. Yes, the industry is moving toward SF₆-free solutions

Yes, the industry is moving toward SF₆-free solutions. But for applications demanding the highest fault currents, compact footprints, and decades of proven reliability, the 8DN9 remains a gold standard. Siemens continues to support it with spare parts, training, and digital upgrades, ensuring that 8DN9 installations commissioned today will still be operating efficiently in 2050.