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    4 kVA Isolation Transformer, 3 phase, 400V to 208V

    5 out of 5 based on 4 reviews | Write a review
    Reasonable price 4kVA isolation transformer, convert 3 phase voltage 400V input to 208V output, provides increased reliability and higher efficiency, make this step up/down transformer ideal for a wide range of applications.
    30-day Returns
    Delivery date: 10-20 days

    4 kVA Isolation Transformer Features:

    • To step down/up the 3 phase voltage 400V to 208V.
    • Primary and secondary windings are separated by aluminium/copper shield.
    • Available in the circuit of AC 50Hz/60Hz.
    • Better protection, high quality workmanship.

    4 kVA Isolation Transformer Specifications

    Basics Model ATO-SG4KVA
    Phase 3 phase
    Capacity 4 kVA
    Weight of Aluminium Wire Transformer Open type: 50kg
    Protected type: 65kg
    Weight of Copper Wire Transformer  Open type: 50kg
    Protected type: 65kg
    Technical Parameters Primary Voltage 400V (Optional: 120V/ 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    Secondary Voltage 208V (Optional: 120V/ 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    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

    4 kVA Isolation Transformer Installation Dimension

    3 phase isolation transformer dimension

    Aluminium Wire Transformer Size Copper Wire Transformer Size
    Open type: a*b*c=300*155*310mm Open type: a*b*c=300*155*310mm
    Mouting size: d*e=180*125mm Mouting size: d*e=180*125mm
    Protected type: A*B*C=300*440*500mm Protected type: A*B*C=300*440*500mm

    Tips: Characteristics of 4 kVA 3 phase isolation transformer at the AC power output

    1. Avoid the current distortion of non-linear load to affect the normal operation of AC power and influence to the Grid, it plays a role in purifying the power Grid.
    2. Take sample at the input end of this three phase 400/230V to 208/120V isolation transformer, so that the distortion of the non-linear load current will not affect the accuracy of the sampling and the control signal that can reflect the actual situation can be obtained.
    3. If the load is not balanced, it will not affect the normal operation of the stabilized voltage power supply.

    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 4 kVA Isolation Transformer, 3 phase, 400V to 208V
    Wheels for 3 phase 4kVA isolation transformer
    We want to remove the wheels on your 3-phase, 4kVA transformer and use the holes to install the transformer on our support. Could you confirm to us if it's possible?
    From: Karma | Date: 17/08/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can remove the wheels on the transformer, its free option.
    How can I choose shipping company while ordering?
    I want to use FedEx shipping company to ship to our Site in Japan? Can you do this? How can I choose shipping company while ordering?
    From: Matt Duncan​ | Date: 09/09/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can use any of the 3 shipping companies "UPS/DHL/FedEx", just confirm us by email after ordering.
    Awesome Quality
    I should give 5 stars because this 4 kVA isolation transformer performs better than expected. It is used to reduce the noise of my audio equipments in my bar. After my equipments hooked up with the secondary outputs, they work nearly perfect without buzzing any more. Moreover, this ATO isolation transformer run incredible quiet and smoothly. It is really recommended when you need a unit to clean noises.
    From: Terry | Date: 04/03/2019
    Was this review helpful? Yes No (0/0)
    Quiet and powerful isolation transformer
    At considerable savings, I bought two 4 kVA isolation transformers from ATO. I use them to transform 460V voltage down to 220V. They are not hard to handle and work really well.They are incredibly quiet and protect my electronic devices from terrible power.
    From: Ikari | Date: 27/02/2019
    Was this review helpful? Yes No (0/0)
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