(0) Shopping cart
You have no items in your shopping cart.
Shopping Categories

    25 kVA Isolation Transformer, 3 phase, 380 Volt to 220 Volt

    5 out of 5 based on 4 reviews | Write a review
    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.
    30-day Returns
    Delivery date: 10-20 days

    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 ATO-SG25KVA
    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

    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

    ATO isolation transformers schematic diagram

    3 Phase Isolation Transformer Details

    3-phase isolation transformer details

    25 kVA Isolation Transformer Installation Dimension

    3 phase isolation transformer 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?

    1. 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.
    2. 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.
    3. Confirm the required input rated current (A) of the electrical equipment to determine the transformer capacity (KVA).
    4. Insulation class requirements: A class 105 ℃, B class 130 ℃, F class 155 ℃, H class 180 ℃.
    5. Autotransformer or isolated transformer.

    How to Test Step Up & Step Down Isolation Transformer?

    Need more detail of ATO isolation transformer? Here is a good explanation about it in this video. To test the accuracy of the transformer voltage, we take a 3000 VA single phase 220V iuput to 110V output isolation transformer as an example.

    Existing reviews of 25 kVA Isolation Transformer, 3 phase, 380 Volt to 220 Volt
    3-phase isolation transformer works great!!
    Opened this 25kVA isolation transformerup to change to the recep to an isolated ground recep (orange). Wiring and terminations were done well inside. Durable steel housing. Nothing scammy inside.
    From: zta | Date: 23/05/2022
    Was this review helpful? Yes No (0/0)
    Need a isolation transformer with 15kVA rating
    The capacity of this 25kVA isolation transformer is to big for us. Can you provide us a model for a transformer with the following characteristics?
    15kVA rating
    3 Phase
    Input configuration: Y or Delta
    Output: 220/380Volts
    Output configuration: Y
    From: Lachlan | Date: 28/12/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, recommended Isolation Transformer SKU:  ATO-T-SG15KVA
    Power capacity: 15kVA
    Primary: 3ph, Delta (L1,L2,L3 + G), 220V
    Secondary: 3ph, Wye (L1,L2,L3 + N,G), 380V
    Aluminum wire
    Cooling Mode: Dry type air cooling.
    Type: Protected.
    The site link:
    Can you supply 2 transformer to suit my requirements?
    We have an industrial installation for Canada. Supply voltage 400v 60Hz 3ph. Motor spec 460V 60Hz 3ph 25hp. There are two of these pumps. Can you supply 2 transformer to suit these requirements?
    From: Braeden | Date: 10/10/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can, recommended transformer for each pump will be 25kVA capacity.
    Nothing to say, very reliable transformer
    I am quite pleased with this 25 kVA isolation transformer. Although it is a little heavy but then fit for purpose. I also like that this is a dual function transformer to work in reverse to step down 220 volts to 120 when needed. Will surely recommend for people who want to use appliances across countries.
    From: Bill Porter | Date: 25/09/2018
    Was this review helpful? Yes No (0/0)
    Load more reviews...
    Write your review for 25 kVA Isolation Transformer, 3 phase, 380 Volt to 220 Volt
    • Only registered users can write reviews
    • Bad
    • Excellent