3EQ3
HV Surge Arrester 3EQ3, Composite hollow-core silicone housing, 20 kA, ≤800 kV
3EQ3
- Metal-oxide surge arrester with composite hollow-core design for high-voltage systems up to 800 kV
- Protects circuit breakers, transformers, generators, motors, capacitors, bushings and switchgear
- Line discharge class 4/5 — energy absorption up to 16 kJ/kVr, long-duration current impulse up to 3200 A
- High current impulse 100 kA (4/10 µs); rated short-circuit current up to 80 kA per catalog
- Tested to IEC 60099-4 · alternating sheds in gray silicone rubber
Transformer protectionCircuit breaker protectionSwitchgear and bushing protectionCapacitor bank protectionGenerator and motor protection
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3EQ3 covers up to 800 kV of the hv station arresters range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | 3EQ3 |
| Product type | Metal-oxide surge arrester |
| Application | High-voltage systems |
| Protection of | Circuit breakers, transformers, generators, motors, capacitors, bushings, switchgear |
Electrical
| Max. system voltage Us | 800 kV |
| Max. rated voltage Ur | 684 kV |
| Min. system voltage | 245 kV |
| Nominal discharge current In | 20 kA |
| Short-circuit rating Isc | 65 kA |
| Line discharge class | 4/5 |
| Rated short-circuit current (catalog family max) | 80 kA |
| Continuous operating voltage Uc | up to 499 kV (at Ur 624 kV) |
| Energy absorption capability Eth | 10.0 / 14.0 / 16.0 kJ/kVr (LD class 4 / 5 / 5) |
| Long-duration current impulse I2ms | 1600 / 2000 / 3200 A |
| High current impulse (4/10 µs) | 100 kA |
| Residual voltage example (8/20 µs, 20 kA, Ur 420 kV) | 1063 kV |
| Residual voltage example (8/20 µs, 20 kA, Ur 624 kV) | 1449 kV |
| Switching-impulse residual voltage example (30/60 µs, 2 kA, Ur 624 kV) | 1194 kV |
| Energy class per IEC 60099-4 Ed. 3.0 | Station, high duty (SH) criteria: In 20 kA, Qrs ≥ 2.4 C, Wth ≥ 10 kJ/kVr — 3EQ3 published ratings (In 20 kA, Eth 10–16 kJ/kVr) meet the In and Wth criteria |
Mechanical / environment
| Housing material | polymer |
| Design | Polymer hollow-core housing |
| Sheds | Alternating sheds, gray silicone rubber |
| Housing height H | 3400–7500 mm (housing sizes 2xL … 3xU) |
| Creepage distance | 9790–23700 mm (housing-size dependent) |
| Specified short-term load SSL | 5600–12350 N (12350 N at 2xL … 5600 N at 3xU) |
| Specified long-term load SLL | 3920–8640 N |
| Bending moment dynamic | 42/72 kNm |
| Grading ring diameter | 1200–2650 mm |
| Max. arrester weight | up to 538 kg (3xU) |
| Housing insulation example (3xU) | LIWV 3184 kV / SIWV 2306 kV / 1-min wet power-frequency 1482 kV |
| Mounting options | Grounded or insulated base; 270 × 270 mm bolt pattern or Ø 419.1 mm bolt circle (6×Ø22); NEMA variants |
| Housing material temperature performance | Silicone rubber, –60 °C to +200 °C (material rating) |
Standards & certifications
| Standards | IEC 60099-4 |
| Housing flammability (silicone rubber) | IEC 60707 / UL 94 V-0, self-extinguishing |
Options & variants
Representative catalog phase-arrester ratings (HV surge arrester catalog p. 104). Order numbers encode Ur in kV at MLFB positions 5–7 (catalog pp. 102–103); SAP materials 3EQ31245CZ7E (Ur 124 kV) and 3EQ30805CZ7 (Ur 80 kV) encode lower ratings under the same Ur-digit scheme and sit below the phase-arrester table above.
| Us (kV) | Ur (kV) | Uc (kV) | LD class | I2ms (A) | Residual @ 20 kA 8/20 µs (kV) | Min. housing | Type |
|---|---|---|---|---|---|---|---|
| 420 | 336 | 269 | 4 | 1600 | 850 | 2xL | 3EQ3 336-3P.4 |
| 420 | 360 | 288 | 5 | 2000 | 883 | 2xM | 3EQ3 360-4P.5 |
| 550 | 420 | 336 | 4 | 1600 | 1063 | 2xS | 3EQ3 420-3P.4 |
| 550 | 444 | 355 | 5 | 3200 | 1031 | 2xS | 3EQ3 444-5P.5 |
| 800 | 580 | 464 | 5 | 3200 | 1347 | 3xS | 3EQ3 580-5P.5 |
| 800 | 597 | 478 | 5 | 3200 | 1386 | 3xS | 3EQ3 597-5P.5 |
| 800 | 624 | 499 | 5 | 3200 | 1449 | 3xU | 3EQ3 624-5P.5 |
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 catalog (3EQ3 section, pp. 101–107)
Guide Metal-oxide Surge Arresters in High-voltage Power Systems (application handbook, 4th ed.)
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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