Three-phase transformer 208 V / 400 V + N
European machines on a 208 V supply · vector group Dyn11 · 1 to 100 kVA · made in France
No reviews of this model yet8 kVA11.5 A per phase on the secondary
- —
- —
- 5-year warranty · wound and tested in Gailhan
Key features
This three-phase transformer steps up a 208 V supply — the 208Y/120 V system found in commercial buildings and many workshops in North America — to 3 × 400 V + N: 400 V between phases and 230 V between each phase and neutral. It lets you install a European machine across the Atlantic without modifying it. Vector group Dyn11, electrostatic shield as standard, 1 to 100 kVA in IP00, IP23 or IP54, and 125 to 1,000 kVA on request: it is wound and tested in our workshop in Gailhan, in the Gard (southern France).
In North America, the supply is 60 Hz: the three-phase transformer must be designed for 60 Hz, which we do on confirmation. Also check that your European machine accepts 60 Hz.
Many American plants are supplied at 480 V between phases: that calls for a different transformer, which we build to order.
The machine gets its original supply back: 400 V between phases, 230 V phase to neutral for its single-phase circuits.
When should you use a 208 V / 400 V three-phase transformer?
- Installing a European production machine in a North American building supplied at 208 V.
- Powering laboratory or test equipment designed for 400 V + N.
- Running a European packaging line, bakery oven or compressor in the United States or Canada.
- Showing European machines at a North American trade show.
It works at 50 Hz, or at 60 Hz on confirmation. It is not suitable for 400 Hz supplies.
Specifications of the 208 V / 400 V + N three-phase transformer
Values for the selected configuration: 8 kVA · IP23.
- Phase-to-phase voltage
- 3 × 208 V
- Connection
- Delta (Δ)
- Rated line current
- 22.2 A
- Terminals
- 1U 1V 1W + PE
- Phase-to-phase voltage
- 3 × 400 V
- Connection
- Star with neutral (YN)
- Rated line current
- 11.5 A
- Phase-to-neutral voltage
- 230 V
- Terminals
- 2U 2V 2W 2N + PE
- Type
- Dry-type transformer, natural cooling
- Core
- 3 limbs, one coil per phase
- Insulation class
- H (180 °C)
- Electrostatic shield
- Fitted as standard, earthed
- Standards
- EN IEC 61558-1 and EN IEC 61558-2-4
- IP rating
- IP23, ventilated metal enclosure
- Overall dimensions L × W × H
- 525 × 320 × 550 mm
- Weight
- 131 kg
- Mounting
- 2 feet, holes Ø 12 mm
- Ambient temperature
- 40 °C maximum
From 63 to 100 kVA, losses and efficiency are available on request.
Ratings and prices
From 1 to 100 kVA. Above that, on request.
| Rating | Prim. / sec. current | Recommended circuit breaker | No-load / load losses | Efficiency | Weight | Dimensions (mm) | Price ex VAT | Dispatch |
|---|---|---|---|---|---|---|---|---|
| 1 kVA | 2.8 / 1.4 A | D 4 A | 13 / 54 W | 93.7 % | 13 kg | 340 × 310 × 350 | €381.58 | 3 days |
| 2 kVA | 5.6 / 2.9 A | D 6 A | 22 / 108 W | 93.9 % | 20 kg | 340 × 310 × 350 | €430.75 | 3 days |
| 2.5 kVA | 6.9 / 3.6 A | D 10 A | 24 / 128 W | 94.3 % | 22 kg | 340 × 310 × 350 | €448.25 | 3 days |
| 3.15 kVA | 8.7 / 4.5 A | D 10 A | 30 / 141 W | 94.8 % | 26 kg | 340 × 310 × 350 | €467.42 | 3 days |
| 4 kVA | 11.1 / 5.8 A | D 16 A | 42 / 239 W | 93.4 % | 40 kg | 460 × 320 × 500 | €665.75 | 3 days |
| 5 kVA | 13.9 / 7.2 A | D 16 A | 51 / 260 W | 94.1 % | 46 kg | 460 × 320 × 500 | €694.92 | 3 days |
| 6.3 kVA | 17.5 / 9.1 A | D 20 A | 59 / 283 W | 94.9 % | 52 kg | 460 × 320 × 500 | €736.58 | 3 days |
| 8 kVA | 22.2 / 11.5 A | D 25 A | 90 / 278 W | 95.6 % | 74 kg | 525 × 335 × 550 | €1,031.58 | 3 days |
| 10 kVA | 27.8 / 14.4 A | D 32 A | 98 / 327 W | 95.9 % | 81 kg | 525 × 335 × 550 | €1,094.92 | 3 days |
| 12 kVA | 33.3 / 17.3 A | D 40 A | 114 / 356 W | 96.2 % | 92 kg | 525 × 335 × 550 | €1,425.75 | 3 days |
| 16 kVA | 44.4 / 23.1 A | D 50 A | 131 / 424 W | 96.6 % | 105 kg | 525 × 335 × 550 | €1,432.42 | 3 days |
| 20 kVA | 55.5 / 28.9 A | D 63 A | 147 / 522 W | 96.8 % | 116 kg | 525 × 335 × 550 | €1,514.92 | 3 days |
| 25 kVA | 69.4 / 36.1 A | D 80 A | 163 / 540 W | 97.3 % | 131 kg | 525 × 335 × 550 | €1,686.58 | 3 days |
| 40 kVA | 111.0 / 57.7 A | D 125 A | 150 / 888 W | 97.5 % | 132 kg | 700 × 480 × 720 | €2,255.75 | 3 days |
| 50 kVA | 138.8 / 72.2 A | MCCB 160 A | 206 / 866 W | 97.9 % | 174 kg | 700 × 480 × 720 | €2,383.25 | 3 days |
| 63 kVA | 174.9 / 90.9 A | MCCB 200 A | —* | —* | 220 kg | 700 × 480 × 720 | €3,789.92 | 6 days |
| 100 kVA | 277.6 / 144.3 A | MCCB 315 A | —* | —* | 345 kg | 700 × 480 × 720 | €5,358.25 | 6 days |
| 125 to 1,000 kVA | On request, in the standard ratings: 125, 160, 200, 250, 315, 400, 500, 630, 800 and 1,000 kVA. Request a quote | |||||||
Rated currents: primary at 208 V / secondary at 400 V. Type D circuit breaker on the primary. Losses and efficiency: design values at full load. * 63 to 100 kVA: losses and efficiency on request. Prices exclude carriage. Calculator formula: kVA = √3 × 400 V × A ÷ 1,000 (current on the 400 V side), next standard rating up.
Wiring diagram and enclosure drawing
Extracts from the datasheet: coil-by-coil connections and enclosure dimensions.
Installation and protection
Values for 25 kVA. Sizing of the installation remains the installer's responsibility.
Upstream protection
Type D circuit breaker 40 A
or aM fuses 40 A · inrush current ≈ 433 A peak
Secondary neutral
- Earthed: TN-S system, the most common.
- Isolated from earth: IT system, with an insulation monitoring device.
Safety
- Connection by a qualified person.
- Earth connected before switching on.
- IP00: in a cabinet or a closed electrical room.
Standards, warranty and options
A standard transformer, built to order and adaptable to your installation.
Frequently asked questions
About the 208 V / 400 V + N three-phase transformer.
Does the transformer work at 60 Hz?
Yes, if the 208 V to 400 V transformer is designed for 60 Hz: state it when you order or in your quote request, and we will confirm it before manufacture.
My plant runs on 480 V: is this model suitable?
No: this three-phase transformer is designed for a 208 V supply. For 480 V between phases, ask for a custom transformer.
Do you deliver to North America?
Yes: shipping to the United States or Canada is priced in your quote, according to the rating and packaging.
How do you wire a three-phase 208 V to 400 V transformer?
Primary connection: the supply goes to terminals 1U, 1V and 1W, earth to PE; the delta connection is made at the factory. On the secondary, the outgoing circuits leave from terminals 2U, 2V and 2W, and the neutral from terminal 2N. The full wiring diagram is on the datasheet.
Which rating should I choose?
To choose your 208 V / 400 V three-phase transformer, multiply the current per phase on the 400 V side by 400 V and by √3, then take the next standard rating up. For 16 A per phase: 11.1 kVA, so a 12 kVA unit. The calculator above the table does this for you.
Do you make three-phase transformers above 100 kVA?
Yes, on request: we also make this 208 V / 400 V three-phase transformer from 125 to 1,000 kVA, in the standard ratings 125, 160, 200, 250, 315, 400, 500, 630, 800 and 1,000 kVA. Choose the rating at the top of the page, below the priced ratings, or request a quote: reply within 48 h.
What upstream protection should I install?
On the primary (208 V) of your 208 V / 400 V three-phase transformer, a type D circuit breaker or aM fuses sized for the rated current: for 8 kVA, 22.2 A per phase, i.e. a 25 A type D circuit breaker or 25 A aM fuses. At switch-on, the inrush current reaches about twelve times the rated current; the rating for each size is given in the table.
IP00, IP23 or IP54: which should I choose?
IP00: open-frame transformer, to be installed in a cabinet or a closed electrical room. IP23: ventilated enclosure, for a plant room sheltered from water. IP54: closed enclosure, protected against dust and splashing water.
What are the lead times?
From 1 to 50 kVA, dispatched from our workshop within 3 working days; from 63 to 100 kVA, within 6 working days. Up to 30 kg, the transformer ships as a parcel, with free delivery within France. Heavier units travel on a pallet with Kuehne + Nagel: 48 to 72 hours in mainland France, 96 hours elsewhere in Europe; pallet delivery is free from €1,000 ex VAT, otherwise a flat €50 ex VAT.
Customer reviews
No reviews of this model yet. Here is what customers say about another three-phase transformer built the same way (reviews in French).
Livraison rapide, produit conforme et bien emballé. Installation sans difficulté, parfait pour créer un neutre. Le service téléphonique est top, fabrication française en plus. Je recommande sans hésiter.
Produit reçu rapidement, très bien emballé. Fonctionne parfaitement sur notre installation industrielle. Fabrication sérieuse, rien à signaler après plusieurs semaines d'utilisation. Content d'acheter français.
Produit conforme à la description, fabrication robuste et délai respecté. Service client à l’écoute, installation réalisée sans souci. Très satisfait de la qualité, matériel professionnel, rien à dire de plus.
Other three-phase transformers
Built the same way, for other voltages.