Three-phase transformer 400 V / 230 V + N
Step-down 3 × 400 V → 3 × 230 V · vector group Dyn11 · 1 to 100 kVA · made in France
No reviews of this model yet4 kVA10.0 A per phase on the secondary
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- 5-year warranty · wound and tested in Gailhan
Key features
This three-phase transformer steps a 3 × 400 V supply down to 3 × 230 V between phases, to power machines and equipment designed for 230 V three-phase (formerly called 220 V). It isolates your installation from the supply and brings out a neutral on the secondary: between a phase and this neutral, you measure 133 V. 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 (Gard, southern France).
That is not the job of this three-phase transformer: it provides 230 V between phases, not between a phase and neutral. On a 3 × 400 V + N supply, single-phase 230 V is already there, between a phase and neutral. Without a neutral, choose the 400 V / 400 V + N transformer (230 V between each phase and neutral) or the three-phase to single-phase transformer, also known as a “converter” or “3 to 1 phase transformer” (a single 230 V output).
It does not need a transformer: connected in star, it runs directly on the 3 × 400 V supply. The 400 V / 230 V three-phase transformer is for machines that only accept 3 × 230 V.
For connecting the secondary to earth (TN-S system) or monitoring it with an insulation monitoring device (IT system). It is the former 127/220 V system, now 133/230 V.
When should you use a 400 V / 230 V three-phase transformer?
- Supplying a machine tool, oven or compressor designed only for 230 V (or 220 V) three-phase.
- Running equipment imported from a country where three-phase is distributed at 220–230 V between phases.
- Keeping an old 127/220 V installation in service while it is being modernised.
- Fitting a 400 V / 230 V three-phase transformer to a test bench or maintenance workshop that tests 3 × 230 V equipment.
It works at 50 Hz, or at 60 Hz on confirmation. It is not suitable for 400 Hz supplies.
Specifications of the 400 V / 230 V + N three-phase transformer
Values for the selected configuration: 4 kVA · IP23.
- Phase-to-phase voltage
- 3 × 400 V
- Connection
- Delta (Δ)
- Rated line current
- 5.8 A
- Terminals
- 1U 1V 1W + PE
- Phase-to-phase voltage
- 3 × 230 V
- Connection
- Star with neutral (YN)
- Rated line current
- 10.0 A
- Phase-to-neutral voltage
- 133 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 | 1.4 / 2.5 A | D 2 A | 12 / 58 W | 93.5 % | 12 kg | 340 × 310 × 350 | €381.58 | 3 days |
| 2 kVA | 2.9 / 5.0 A | D 4 A | 22 / 107 W | 93.9 % | 20 kg | 340 × 310 × 350 | €430.75 | 3 days |
| 2.5 kVA | 3.6 / 6.3 A | D 4 A | 24 / 126 W | 94.3 % | 22 kg | 340 × 310 × 350 | €448.25 | 3 days |
| 3.15 kVA | 4.5 / 7.9 A | D 6 A | 30 / 139 W | 94.9 % | 26 kg | 340 × 310 × 350 | €467.42 | 3 days |
| 4 kVA | 5.8 / 10.0 A | D 10 A | 42 / 241 W | 93.4 % | 40 kg | 460 × 320 × 500 | €665.75 | 3 days |
| 5 kVA | 7.2 / 12.6 A | D 10 A | 51 / 255 W | 94.2 % | 46 kg | 460 × 320 × 500 | €694.92 | 3 days |
| 6.3 kVA | 9.1 / 15.8 A | D 10 A | 55 / 306 W | 94.6 % | 50 kg | 460 × 320 × 500 | €736.58 | 3 days |
| 8 kVA | 11.5 / 20.1 A | D 16 A | 90 / 289 W | 95.5 % | 74 kg | 525 × 335 × 550 | €1,031.58 | 3 days |
| 10 kVA | 14.4 / 25.1 A | D 16 A | 98 / 333 W | 95.9 % | 81 kg | 525 × 335 × 550 | €1,094.92 | 3 days |
| 12 kVA | 17.3 / 30.1 A | D 20 A | 114 / 358 W | 96.2 % | 92 kg | 525 × 335 × 550 | €1,425.75 | 3 days |
| 16 kVA | 23.1 / 40.2 A | D 25 A | 131 / 421 W | 96.7 % | 105 kg | 525 × 335 × 550 | €1,432.42 | 3 days |
| 20 kVA | 28.9 / 50.2 A | D 32 A | 147 / 499 W | 96.9 % | 116 kg | 525 × 335 × 550 | €1,514.92 | 3 days |
| 25 kVA | 36.1 / 62.8 A | D 40 A | 155 / 597 W | 97.1 % | 125 kg | 525 × 335 × 550 | €1,686.58 | 3 days |
| 40 kVA | 57.7 / 100.4 A | D 63 A | 158 / 850 W | 97.5 % | 138 kg | 700 × 480 × 720 | €2,255.75 | 3 days |
| 50 kVA | 72.2 / 125.5 A | D 80 A | 190 / 976 W | 97.7 % | 161 kg | 700 × 480 × 720 | €2,383.25 | 3 days |
| 63 kVA | 90.9 / 158.1 A | D 100 A | —* | —* | 220 kg | 700 × 480 × 720 | €3,789.92 | 6 days |
| 100 kVA | 144.3 / 251.0 A | MCCB 160 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 400 V / secondary at 230 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 × 230 V × A ÷ 1,000 (current on the 230 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 400 V / 230 V + N three-phase transformer.
Does this transformer provide single-phase 230 V?
No: this three-phase transformer provides 230 V between two phases and 133 V between a phase and neutral. For single-phase 230 V from a 3 × 400 V supply without a neutral, choose the 400 V / 400 V + N or the three-phase to single-phase transformer.
How does it differ from a 400 V / 400 V + N transformer?
The 400 V / 400 V + N model keeps 400 V between phases and provides 230 V between each phase and neutral. The 400 V to 230 V transformer lowers the voltage between phases to 230 V, for machines that only run on 230 V three-phase.
My motor is marked 230/400 V: do I need this transformer?
No. The rating plate shows that it is connected in delta on 230 V and in star on 400 V: connected in star, it runs directly on the 3 × 400 V supply, without a 400 V to 230 V transformer.
380 V / 220 V: is it the same transformer?
Yes: 380 V and 220 V are the former names for 400 V and 230 V. A machine marked “3 × 220 V” works with this three-phase 400 V to 230 V transformer, and a “380 V / 220 V” transformer is the same unit.
How do I wire a 400 V / 230 V three-phase 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 three-phase 400 V to 230 V transformer, multiply the current per phase on the 230 V side by 230 V and by √3, then take the next standard rating up. For 32 A per phase: 12.7 kVA, so a 16 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 three-phase 400 V to 230 V 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 (400 V) of your 400 V / 230 V three-phase transformer, a type D circuit breaker or aM fuses sized for the rated current: for 4 kVA, 5.8 A per phase, i.e. a 10 A type D circuit breaker or 8 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. Compare all the options: 400 V to 230 V transformers.