Low price 25 kVA isolation transformer is designed to step down 3 phase voltage 380 volt to 3 phase 220 volt, also step up 220 volt to 380 volt vertion for selection, suitable for indoor applications.
25 kVA Isolation Transformer Specifications
Basics | Model | ATOSG-25KVA |
Phase | 3 phase |
Capacity | 25 kVA |
Weight of Aluminium Wire Transformer | Open type: 140kg Protected type: 165kg |
Weight of Copper Wire Transformer | Open type: 142kg Protected type: 168kg |
Technical Parameters | Primary Voltage | 380V (Optional: 120V/ 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V) |
Secondary Voltage | 220V (Optional: 120V/ 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V) |
Voltage Convert | Three phase to three phase |
Frequency | 50Hz / 60 Hz |
Winding Material | Aluminium/Copper wire (Optional) |
Work Efficiency | ≥95% |
Insulation Resistance | ≥50 MΩ |
Electrical Strength | 3000V AC/1 min |
Noise | <35-65dB (1 meter) |
Insulation Grade | H level |
Wiring Mode | Dyn11 |
Cooling Mode | Dry type air cooling |
Overload Capacity | Allow more than 1.2 times rated load to work for up to 4 hours |
Enclosure Protection Grade | IP 24 |
Certificate | CE, ISO |
Warranty | 12 months |
Working Environment | Temperature | -15℃~+40℃ |
Humidity | ≤90%RH, without condensation |
Altitude | <1000m, non corrosive gas and conductive dust |
Note:
Transformer can only convert voltage and CANNOT convert frequency.
Transformer CANNOT convert single phase voltage to 3 phase voltage.
Input/output voltage, power rating and whether with shell of all transformers, can be customized according to clients' requirements.
3 Phase Isolation Transformer Schematic Diagram

3 Phase Isolation Transformer Details

25 kVA Isolation Transformer Installation Dimension

Aluminium Wire Transformer Size | Copper Wire Transformer Size |
Open type: a*b*c=440*330*430mm | Open type: a*b*c=440*330*420mm |
Mouting size: d*e=300*185mm | Mouting size: d*e=300*185mm |
Protected type: A*B*C=420*610*610mm | Protected type: A*B*C=420*610*610mm |
Tips: How to select a 3 phase step up & step down isolation transformer?
- Confirm the power supply voltage (V) provided by the grid and the required input rated voltage of the electric equipment to determine the voltage (V) ratio of the transformer.
- Confirm the phase number of the input power supply required by electrical equipment to determine whether to make three-phase or single-phase system transformer.
- Confirm the required input rated current (A) of the electrical equipment to determine the transformer capacity (KVA).
- Insulation class requirements: A class 105 ℃, B class 130 ℃, F class 155 ℃, H class 180 ℃.
- Autotransformer or isolated transformer.
3 phase 380V to 220V isolation transformer is 50/60 Hz rated, available with aluminium/copper wire winding material, the effective performance and high quality features make it ideal for use in the electrical and the engineering industries.