Disconnectors and earthing switches 3DN0/4/6/7/8, 40.5 kV up to 550 kV, rated normal current up to 5000 A, short-time withstand up to 63 kA, motor or manual operation
3DN0/4/6/7/8
- Part of a portfolio with 123,000 disconnectors delivered to over 110 countries, type-tested to IEC, ANSI and GOST standards
- 3DN0 earthing switches: free-standing up to 550 kV, built-on versions for every disconnector type, switching of induced currents per IEC 62271-102 Class A, Class B or super Class B where required
- 3DN4 vertical break: single pre-adjusted, routine-tested movable current path subassembly; locking system with double kinematics keeps the closed position short-circuit-proof
- 3DN7 V-type up to 145 kV: very compact and economic, all three poles mountable on a single horizontal member; 3DN8 side-break serves the 40.5 kV level
- Block/finger contact system without pressing springs — contact force is self-produced and increases under short-circuit conditions; arc restrictors (bus-transfer contacts) are available for all disconnector types, with an optional 1600 A bus-transfer current capability offered by most types
- Poles ship pre-assembled and pre-adjusted; 3DV6/7 (aluminium housing, -60 to +55 °C) and 3DV8 (stainless-steel housing, IP 55) motor drives, also manually operable
Air-insulated substations, 40.5 kV up to 550 kVGuaranteed de-energisation and earthing of high-voltage equipment (3DN0)Substations with limited phase-to-phase spacing (3DN4 vertical break)Compact, wall- or ceiling-mounted arrangements up to 145 kV (3DN7 V-type)40.5 kV switchyards (3DN8 side-break)
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3DN0/4/6/7/8 covers up to 40.5 kV of the disconnectors range (≤ 550 kV across the category, √ scale).
Specifications
Main
| Type designations | 3DN0 (earthing switches), 3DN4 (vertical break), 3DN6, 3DN7 (V-type), 3DN8 (side-break) |
| Product type | High-voltage AIS disconnectors and earthing switches |
| Contact system | Block/finger, spring-free self-produced contact force, graphite-silver (AgC) dry lubrication |
| Operating mechanism | Motor (3DV6/7 or 3DV8) or manual; rated nominal torque 600 and 800 Nm, operational time < 15 s, IP 55 |
| Bus-transfer capability (optional) | Arc restrictors available for all disconnector types; optional 1600 A bus-transfer current capability on most types, type-tested with more than 100 operating cycles of current making and breaking |
| Maintenance interval | 25 years |
| Standards | Type-tested to IEC, ANSI, GOST; earthing switches per IEC 62271-102 Class A / B / super Class B where required |
3DN0 — Earthing switches
| Voltage levels | Free-standing versions up to 550 kV; built-on versions for every disconnector type in the range |
| Rated normal current | up to 1000 A |
| Rated peak withstand current | up to 160/164 kA |
| Rated short-time withstand current | up to 63 kA (1/3 s) |
| Lightning impulse withstand (1.2/50 µs), to earth and between phases | 185 kV at 40.5 kV up to 1675 kV at 550 kV |
| Ambient temperature range | -55 °C up to +55 °C |
| Icing class | 10 / 20 mm |
3DN4 — Vertical-break disconnector (HBF series)
| Rated voltage | 72.5 kV up to 550 kV |
| Rated normal current | up to 5000 A |
| Rated peak withstand current | up to 160 kA |
| Rated short-time withstand current | up to 63 kA (1/3 s) |
| Lightning impulse withstand (1.2/50 µs), to earth / across isolating distance | 325 / 375 kV at 72.5 kV up to 1550 / 1550 (+315) kV at 550 kV |
| Ambient temperature range | -55 °C up to +55 °C |
3DN7 — V-type disconnector (VR series)
| Rated voltage | 72.5 kV up to 145 kV |
| Rated normal current | up to 3150 A |
| Rated peak withstand current | up to 125 kA |
| Rated short-time withstand current | up to 50 kA (1/3 s) |
| Lightning impulse withstand (1.2/50 µs), to earth / across isolating distance | 325 / 375 kV at 72.5 kV up to 650 / 750 kV at 145 kV |
| Installation | Free-standing, wall and ceiling installation possible |
3DN8 — Side-break disconnector (SR0 series)
| Rated voltage | 40.5 kV |
| Rated normal current | up to 2000 A |
| Rated peak withstand current | up to 100 kA |
| Rated short-time withstand current | up to 40 kA (1/3 s) |
| Lightning impulse withstand (1.2/50 µs), to earth / across isolating distance | 185 / 215 kV |
3DN6
| Ratings | No digitized ratings source in this library — detailed ratings available on request |
Documents & downloads
Brochure Disconnectors and earthing switches — high-voltage portfolio brochure (SHVC, 2025)
Brochure Global Parts Services for high-voltage AIS disconnectors (2023)
Brochure Disconnectors and earthing switches — Siemens Energy Brazil brochure (current online edition)
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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