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.