3DN5
Knee-type disconnector 3DN5, ≤ 145 kV, 4000 A, 63 kA
3DN5
- Knee joint in the main current path reduces vertical opening space and pole-to-pole phase distance — built for substations with limited phase spacing, with high disconnection visibility
- Maintenance-free contacts and a self-interlocked end position close to the main current path — reliable and safe operation even during failure or movement, e.g. earthquake
- Robust modular design with pre-adjusted subassemblies from the factory; low operation moment allows manual operation with reduced effort
- Optional bus transfer current capability of 1,600 A (busbar transfer per IEC 62271-102 Annex B)
- Exceeds IEC requirements and meets GB & DL standards; double-knee-type variant enables a particularly compact substation design
Substations with limited phase distancesHigh-voltage air-insulated substationsBusbar transfer switchingCompact substation designs (double-knee-type variant)
Sign in to see your price, availability and framework terms for 3DN5.
Horizon-3 pattern: this exact page gains commerce powers on sign-in — the URL never changes.
SIMULATED · ASK-AN-EXPERT PILOT DEMO
Ask an expert about 3DN5
15 minutes with the right switchgear specialist — question in, booked call out. No email archaeology.
Checking availability…
3DN5 covers up to 145 kV of the disconnectors range (≤ 550 kV across the category, √ scale).
Specifications
Main
| Product family | 3DN5 (GBF series or KR series) |
| Product type | Knee-type disconnector, high-voltage AIS |
| Application | Substations with limited phase distances; small space requirement in both vertical and horizontal direction |
| Rated voltage (this entry) | 123 / 126 kV (≤ 145 kV scope; family available up to 550 kV) |
| Contact system | Siemens Energy block / finger contact system — spring-free self-produced contact force, graphite-silver (AgC) coated, dry-lubricated, maintenance-free |
Electrical ratings (123 / 126 kV variants)
| Rated power-frequency withstand voltage (50 Hz, 1 min), to earth and between phases | 230 kV |
| Rated power-frequency withstand voltage, across the isolating distance | 265 kV (123 kV) / 230 (+70) kV (126 kV) |
| Rated lightning impulse withstand voltage (1.2/50 µs), to earth and between phases | 550 kV |
| Rated lightning impulse withstand voltage, across the isolating distance | 630 kV (123 kV) / 550 (+103) kV (126 kV) |
| Rated normal current | up to 4,000 A |
| Rated peak withstand current | up to 160 kA |
| Rated short-time withstand current | up to 63 kA |
| Rated duration of short-circuit | 1 s / 3 s |
| Bus transfer current capability | 1,600 A (optional) |
Mechanical & environment
| Ambient temperature range | −55 °C … +55 °C |
| Icing class | 10 / 20 mm |
| Operating mechanism | Motor or manual operation (3DV6/7 or 3DV8 motor drives, IP 55, hand-crank capable) |
| Control voltage | 60/110/125/220 V DC; 110/125/220 or 220…230 V AC 1~; 220/380/415 V AC 3~; 50/60 Hz |
| Maintenance interval | 25 years |
| Assembly | Pre-adjusted subassemblies from the factory; modular design for easy on-site assembly |
Standards & certifications
| Product standard | IEC 62271-102 (high-voltage disconnectors and earthing switches); all table values in accordance with IEC, other values on request |
| Additional conformity | Exceeding the IEC and meeting GB & DL standards |
| Quality management | ISO 9001-assured manufacturing |
Options & variants
Full 3DN5 family (GBF/KR series) as published in the Siemens Energy 'Disconnectors and earthing switches' brochure (SHVC Hangzhou, 2025), pp. 14–15. This catalog entry covers the ≤ 145 kV variants (123/126 kV rows). Common family data: rated normal current up to 4,000 A, peak withstand up to 160 kA, short-time withstand up to 63 kA (1/3 s), icing class 10/20 mm, −55…+55 °C.
| Rated voltage [kV] | Power-freq. withstand, to earth [kV] | Power-freq. withstand, across isolating distance [kV] | Lightning impulse withstand, to earth [kV] | Lightning impulse withstand, across isolating distance [kV] | Switching impulse withstand, to earth [kV] |
|---|---|---|---|---|---|
| 123 | 230 | 265 | 550 | 630 | – |
| 126 | 230 | 230 (+70) | 550 | 550 (+103) | – |
| 245 | 460 | 530 | 1050 | 1200 | – |
| 252/300 | 395 | 435 | 1050 | 1050 (+170) | – |
| 362 | 450 | 520 | 1175 | 1175 (+205) | 950 |
| 420 | 520 | 610 | 1425 | 1425 (+240) | 1050 |
| 550 | 740 | 740 (+318) | 1675 | 1675 (+315) | 1300 |
Compatible accessories
Operating mechanism
Motor drive for high-voltage disconnectors — aluminum cast housing, IP 55, motor or hand-crank operation, torque 600/800 Nm
Operating mechanism
Motor drive, smart design — stainless-steel housing, IP 55, maintenance-free encapsulated worm drive
Earthing switch
Earthing switch, built-on (lateral or integrated) or stand-alone — inductive/capacitive switching per IEC 62271-102 Class A or B available
Contact accessory
Arc restrictors — bus transfer contacts for busbar transference switching (IEC 62271-102 Annex B, type-tested >100 operational cycles)
Documents & downloads
Brochure Disconnectors and earthing switches — portfolio brochure with 3DN5 technical data (Siemens Energy SHVC Hangzhou, 2025)
Brochure Disconnectors and earthing switches — Siemens Energy Brazil brochure (current online edition)
Also covered in the technical library
Catalog Disconnectors & Earthing Switches — High-Voltage Catalogue (Siemens Energy Brazil)
Brochure Disconnectors and Earthing Switches — High-Voltage Portfolio (3DN0–3DN9, 3DV Motor Drives)
Brochure Global Parts Services for High-Voltage AIS Disconnectors
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
Related products
3DN