3EC3
Railway Surge Arrester 3EC3, DC traction 0.75–3 kV DC systems, porcelain housing
- Gapless metal-oxide varistor in a porcelain housing for the protection of DC traction power systems (750 V, 1.5 kV and 3 kV) and electrical installations on traction vehicles
- Base flange integrates a pressure-relief device with gas diverter nozzle for a defined blow-out direction in case of overload; drain holes let rainwater run off
- Suitable for both outdoor and indoor installation; design corresponds to EN 50123-5/A1, listed as designation DC-B per DIN EN 50526-1
- Shock and vibration tested to IEC 61373 for rail applications with travel speeds up to 160 km/h
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3EC3 covers up to 4 kV of the railway arresters range (≤ 25 kV across the category, √ scale).
Specifications
Main
| Product family | 3EC3 |
| Product type | Metal-oxide surge arrester (DC, gapless) |
| Application | DC traction systems and electrical installations on traction vehicles |
| Installation | Outdoor or indoor |
| Designation (DIN EN 50526-1) | DC-B |
| Max. travel speed | 160 km/h |
Electrical
| Rated voltage Ur | 1 / 2 / 4 kV DC (by variant) |
| Continuous operating voltage Uc | 1 / 2 / 4 kV DC (= Ur) |
| Residual voltage Up at In (10 kA, 8/20 µs) | 2.4 / 4.8 / 9.6 kV |
| Nominal discharge current In | 10 kA |
| Pressure relief current | 40 kA |
Mechanical / environment
| Housing material | Porcelain, on light-metal base flange with pressure-relief device and gas diverter nozzle |
| Height | 196 mm (+27 mm terminal stud, 223 mm overall) |
| Flange diameter | 190 mm |
| Fixing | 3× ø11 mm holes on ø162 mm bolt circle (120° spacing) |
| Terminals | Supply terminal M10, earth terminal M10×30 |
| Creepage distance | 165 mm |
| Flashover distance | 135 mm |
| Weight | 6.0–6.4 kg (by variant) |
Standards & certifications
| Design standard | EN 50123-5/A1 |
| DC arresters for railway applications | DIN EN 50526-1 |
| Shock and vibration | IEC 61373 |
Options & variants
Ur, Uc, Up, In and weights per operating instructions 92800019171e; order numbers and DC-B designation per rail-arrester product master data (Index T, 2025-02). Un of 3EC3 020 is printed '15 kV DC' in the master data — a decimal-loss typo: Siemens Energy dimension drawing 3HH 802 57583 states max. system voltage Um 0.75 / 1.5 / 3 kV DC, confirming 1.5 kV DC. Master data additionally rates In 20 kA with residual voltages 2.6 kV (010) / 10.6 kV (040) at 20 kA 8/20 µs, while the operating instructions and the arrester rating plate state In 10 kA.
| Type | Order No. | Nominal system voltage Un | Rated voltage Ur | Continuous operating voltage Uc | Residual voltage Up at In | Weight |
|---|---|---|---|---|---|---|
| 3EC3 010 | C1B48801400001 | 0.75 kV DC | 1 kV DC | 1 kV DC | 2.4 kV | 6.0 kg |
| 3EC3 020 | C1B48801400002 | 1.5 kV DC | 2 kV DC | 2 kV DC | 4.8 kV | 6.2 kg |
| 3EC3 040 | C1B48801400004 | 3 kV DC | 4 kV DC | 4 kV DC | 9.6 kV | 6.4 kg |
Documents & downloads
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