3EQ4
HV Surge Arrester 3EQ4, Polymer hollow core (silicone composite), 10/20 kA, ≤550 kV
3EQ4
- Metal-oxide surge arrester with composite hollow-core design for high-voltage systems
- Silicone-rubber hollow-core housing — hydrophobic, self-extinguishing (IEC 60707 / UL94 V-0), for coastal and heavily polluted sites
- Line discharge class 3/4/5 · energy absorption 8–16 kJ/kV · long-duration current impulse 1100–3200 A
- Rated short-circuit current 65 kA (80 kA available on request), high current impulse withstand 100 kA (4/10 µs)
- Type-tested to IEC 60099-4 — protects transformers, circuit breakers, generators, motors, capacitors, bushings and switchgear
Transformer protectionCircuit breaker protectionGenerator and motor protectionCapacitor bank protectionSwitchgear and bushing protection
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3EQ4 covers up to 550 kV of the hv station arresters range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | 3EQ4 |
| Product type | Metal-oxide surge arrester |
| Application | High-voltage systems |
| Protection of | Circuit breakers, transformers, generators, motors, capacitors, bushings, switchgear |
| Versions | Phase surge arrester (…2P…) and neutral-point surge arrester (…2S/3S…); upright or suspended mounting |
Electrical
| Max. system voltage Us | 550 kV |
| Max. rated voltage Ur | 468 kV |
| Min. system voltage | 123 kV |
| Nominal discharge current In | 20 kA |
| Short-circuit rating Isc | 65 kA |
| Line discharge class | 3/4/5 |
| Short-circuit rating, option | 80 kA on request (e.g. 3EQ4 336-2PN36 …K80 datasheet: Is = 80 kA) |
| High current impulse withstand (4/10 µs) | 100 kA |
| Long-duration current impulse (2 ms) | 1100 A (class 3) / 1600 A (class 4) / 2000–3200 A (class 5) |
| Rated frequency | 48 … 62 Hz |
Energy handling (IEC 60099-4)
| Energy absorption capability Eth | 8.0 / 10.0 / 14.0 / 16.0 kJ/kV (LD class 3 / 4 / 5 / 5) |
| Single-impulse charge transfer Qrs (example, Ur 336 kV) | 2 C |
| Thermal energy rating Wth (example, Ur 336 kV) | 7 kJ/kV |
| Temporary overvoltage (example, Ur 336 kV) | 376 kV for 1 s / 353 kV for 10 s |
Residual voltage (catalog examples, 8/20 µs)
| Ur 192 kV @ 10 kA | 461 kV (LD class 3) |
| Ur 336 kV @ 10 kA | 806 kV (LD class 3; 1016 kV @ 40 kA) |
| Ur 444 kV @ 20 kA | 1031 kV (LD class 5, 3200 A) |
Mechanical / environment
| Housing material | polymer |
| Design | Polymer hollow-core housing |
| Sheds / color | Alternating sheds, gray silicone rubber |
| Height (housings N … 2xV, ≤550 kV range) | 1760 … 4920 mm (1 or 2 units) |
| Min. creepage distance | 5085 … 15430 mm (housing N … 2xV) |
| Specified short-term load SSL | 4260 … 11930 N depending on housing; increased-SSL versions available |
| Specified long-term load SLL | 2980 … 8350 N depending on housing |
| Dynamic bending moment | 21 / 38 kNm |
| Weight | 131 … 304 kg max. (housing N … 2xV) |
| Silicone material temperature capability | –60 °C … +200 °C |
| Installation altitude (example config) | Up to 1000 m a.s.l. |
| Mounting options | Insulated 310×310 mm; grounded/insulated D=10" or 16.5"; grounded 191×191 mm |
Standards & certifications
| Standards | IEC 60099-4 |
| Housing flame retardance | IEC 60707, UL94 V-0 (self-extinguishing silicone rubber) |
Options & variants
Representative phase-arrester ratings from the product-guide tables (pp. 96–97), ≤550 kV system voltage; heights are standard-SSL housings. Full catalog range Ur 102–588 kV incl. neutral-ground versions. MiniCat datasheet for 3EQ4 336-2PN36 confirms In 10 kA / LD class 3 / 2 units / H 3520 mm.
| Ur (kV) | Uc (kV) | In (kA) | LD class | Min. housing | Units | Height (mm) |
|---|---|---|---|---|---|---|
| 192 | 154 | 10 | 3 | N | 1 | 1760 |
| 228 | 182 | 10 | 3 | P | 1 | 1860 |
| 276 | 221 | 10 | 3 | V | 1 | 2460 |
| 336 | 269 | 10 | 3 | 2xN | 2 | 3520 |
| 360 | 288 | 20 | 5 | 2xP | 2 | 3720 |
| 420 | 336 | 20 | 4 | 2xR | 2 | 4120 |
| 444 | 355 | 20 | 5 | 2xS | 2 | 4320 |
Compatible accessories
Earth terminals
Earth terminal, copper tin-plated
Earth terminals
Eyebolt earth terminal
Earth terminals
NEMA earth, stainless steel
Earth terminals
NEMA earth, copper
Earth terminals
Double D14 earth terminal
Terminal adapters
DIN/NEMA adapter terminal
Terminal adapters
Adapter DIN/NEMA to double NEMA
Line connection
Line clamp
Special options
N₂ filling (inert gas)
Documents & downloads
Catalog High-voltage surge arresters — Product guide (3EQ4 chapter pp. 93–100)
Handbook Metal-oxide Surge Arresters in High-voltage Power Systems (4th edition)
Also covered in the technical library
Catalog High-voltage surge arresters — Product guide
Catalog High-voltage surge arresters — Siemens Energy product guide (online edition)
Brochure Our portfolio of surge arresters & composite insulators — Siemens Energy
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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