3EK8
MV Surge Arrester 3EK8, Silicone rubber, cage design, 10 kA, Ur ≤36 kV (The Allrounder)
3EK8
- Metal-oxide surge arrester for medium-voltage distribution networks — protects transformers, circuit breakers, MV switchgear and distribution lines
- Cage design: silicone rubber directly molded onto the MOV column and FRP-rod cage — void-free sealing, no moisture ingress, safe overload behavior without a sealed pressure shell
- Housing: silicone, alternating sheds · hydrophobic, tracking/erosion resistant, self-extinguishing · line discharge class 2
- Energy handling per IEC 60099-4 Ed. 3: charge transfer rating Qrs 0.4 C, thermal charge transfer rating Qth 1.1 C · 20 kA short-circuit rated
- Tested to IEC 60099-4 and IEEE C62.11 — available as IEC (1C), IEEE heavy duty (3A HD) and IEEE riser pole (4A RP) versions
Distribution transformer protectionMV switchgear and panel protectionOverhead distribution line protectionCable riser pole protectionCircuit breaker protection
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3EK8 covers up to 36 kV of the mv distribution arresters range (≤ 72.5 kV across the category, √ scale).
Specifications
Main
| Product family | 3EK8 |
| Product type | Metal-oxide surge arrester |
| Application | Medium-voltage distribution networks |
| Protected equipment | Transformers, circuit breakers, MV switchgear/panels, distribution lines |
| Versions | IEC 60099-4 (1C), IEEE C62.11 heavy duty (3A, HD), IEEE C62.11 riser pole (4A, RP) |
Electrical
| Max. system voltage Us | 36 kV |
| Max. rated voltage Ur | 36 kV |
| Min. system voltage | 3.6 kV |
| Nominal discharge current In | 10 kA |
| Short-circuit rating Isc | 20 kA |
| Line discharge class | 2 |
| Charge transfer rating Qrs (IEC 60099-4 Ed. 3) | 0.4 C |
| Thermal charge transfer rating Qth (IEC 60099-4 Ed. 3) | 1.1 C |
| Residual voltage at 10 kA, 8/20 µs (examples) | 31.8 kV (Ur 12 kV) · 63.6 kV (Ur 24 kV) · 95.4 kV (Ur 36 kV) |
| Residual voltage at 20 kA, 8/20 µs (Ur 36 kV) | 107 kV |
IEEE versions (3EK8 HD / RP)
| Energy class | A (per 3EK8 HD table) |
| Switching surge energy rating | 3.0 kJ/kV MCOV |
| Lightning impulse classifying current | 10 kA |
| Duty-cycle voltage range | 3–36 kV, MCOV 2.55–29.0 kV (HD) · 3–27 kV, MCOV 2.55–22.0 kV (RP) |
Mechanical / environment
| Housing material | silicone |
| Design | Silicone-rubber cage design |
| Sheds | Alternating sheds; silicone directly molded onto MOVs and FRP-rod cage (void- and gap-free sealing) |
| Housing properties | Hydrophobic, high tracking/erosion resistance, self-extinguishing, flame-retardant |
| Height (IEC versions) | 97–390 mm |
| Creepage distance (IEC versions) | 267–1,358 mm (per housing size P…X) |
| Flashover distance (IEC versions) | 109–402 mm |
| Housing insulation withstand | 63–233 kV lightning impulse 1.2/50 µs · 29–108 kV power frequency, 1 min wet |
| Specified short-term load SSL (arrester only) | 510–2,060 N |
| Specified long-term load SLL (arrester only) | 350–1,440 N |
| Weight (without accessories) | approx. 0.5–2.8 kg |
Standards & certifications
| Standards | IEC 60099-4, IEEE C62.11 |
| IEC designation | DH (distribution, high duty) |
Options & variants
Representative ratings from the 3EK8 IEC and 3EK8 HD IEEE tables, MV Surge Arrester Catalogue 01/2026 (catalog pp. 30–33). The two top-ordered SAP materials — 3EK81003CA4 (227 order lines) and 3EK82703GA4 'Surge Arrester, 27/22' (74 lines) — correspond to the 10 kV and 27 kV duty-cycle / 22 kV MCOV IEEE heavy-duty ratings shown in the last two rows (SAP compacts the MLFB letter order slightly differently than the catalog print).
| Order no. | Standard | Ur / duty-cycle voltage (kV) | Uc / MCOV (kV) | Residual voltage @ 10 kA 8/20 µs (kV) | Height | Creepage / leakage distance |
|---|---|---|---|---|---|---|
| 3EK8 030-1CP4 | IEC 60099-4 | 3.0 | 2.4 | 8.0 | 97 mm | 267 mm |
| 3EK8 090-1CQ4 | IEC 60099-4 | 9.0 | 7.2 | 23.9 | 134 mm | 393 mm |
| 3EK8 120-1CQ4 | IEC 60099-4 | 12 | 9.6 | 31.8 | 134 mm | 393 mm |
| 3EK8 180-1CT4 | IEC 60099-4 | 18 | 14.4 | 47.7 | 240 mm | 765 mm |
| 3EK8 240-1CV4 | IEC 60099-4 | 24 | 19.2 | 63.6 | 295 mm | 997 mm |
| 3EK8 360-1CW4 | IEC 60099-4 | 36 | 28.8 | 95.4 | 332 mm | 1,123 mm |
| 3EK8 100-3AC4 | IEEE C62.11 HD | 10 | 8.40 | 30.0 | 5.2 in | 13.0 in |
| 3EK8 270-3AG4 | IEEE C62.11 HD | 27 | 22.0 | 81.0 | 10.2 in | 28.7 in |
Compatible accessories
Line terminals
Line clamp, ø8–18 mm
3EX4 063-0C
Line terminals
L-bracket
3EX4 063-1C
Line terminals
Line clamp, stainless steel
3EX4 063-2C
Line terminals
Line clamp for cable shoe
3EX4 063-5C
Line terminals
Line clamp for cable shoe (NEMA)
3EX4 063-5A
Protection
Bird protection cap
3EX4 128-0A
Brackets
Metal bracket (NEMA)
3EX4 080-1A
Brackets
Metal bracket (DIN)
3EX4 080-2A
Brackets
Insulating bracket (NEMA)
3EX4 080-1C
Transformer brackets
Transformer bracket, size 1
Transformer brackets
Transformer bracket, size 2
Transformer brackets
Transformer bracket, size 3
Transformer brackets
Transformer bracket, size 4
Pole mounting
Cross-arm bracket
Leads
Lead wire, insulated
Leads
Earth lead, flexible
Leads
Earth lead, rigid
Documents & downloads
Catalog MV Surge Arresters Catalogue, edition 2026-01 (3EK8: pp. 30–35, accessories pp. 36–41)
Catalog MV Surge Arresters Catalogue, edition 09/2022
Mini-catalog MiniKat 3EK8 IEC — ratings datasheet (1 page)
Also covered in the technical library
Catalog Medium-voltage surge arresters — Siemens Energy catalog (online edition)
Catalog Medium-voltage surge arresters — Siemens Energy product catalog
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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