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    20 kVA Isolation Transformer, 3 phase, 380V to 190V

    5 out of 5 based on 5 reviews | Write a review
    High performance 20kVA isolation transformer is designed to step down/up the 3 phase voltage 380V to 190V. Primary and secondary windings are separated by aluminium/copper shield, and widely used in various power supply sites with frequency 50Hz/60Hz.
    30-day Returns
    Delivery date: 10-20 days

    High quality and safety isolating transformers, 3 phase, 20kVA power rating, 380V AC input voltage to 190V AC output voltage, is a is a non-ventilated isolation transformer rated for hazardous locations as well as harsh industrial environments.

    20 kVA Isolation Transformer Specifications

    Basics Model ATO-SG20KVA
    Phase 3 phase
    Capacity 20 kVA
    Weight of Aluminium Wire Transformer Open type: 113kg
    Protected type: 140kg
    Weight of Copper Wire Transformer Open type: 123kg
    Protected type: 148kg
    Technical Parameters Primary Voltage 380V (Optional: 120V/ 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    Secondary Voltage 190V (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

    20 kVA Isolation Transformer Installation Dimension

    3 phase isolation transformer dimension

    Aluminium Wire Transformer Size Copper Wire Transformer Size
    Open type: a*b*c=440*310*430mm Open type: a*b*c=440*310*420mm
    Mouting size: d*e=300*165mm Mouting size: d*e=300*165mm
    Protected type: A*B*C=420*610*610mm Protected type: A*B*C=420*610*610mm

    Tips: 3 phase isolation transformer loss

    When the 3 phase isolation transformer output power is equal to the input power, the efficiency reaches 100%, the transformer will not generate any loss. But in fact this kind of transformer does not exist. Transformer always generates loss during electricity transmission, this kind of loss mainly includes copper loss and iron loss. Copper loss refers to the loss caused by step up & step down transformer coil resistance. When the current goes through the coil resistance and gets heated, part of the electrical energy is consumed and becomes heat loss. Since the coil is generally twined with insulated copper wire, it is called copper loss.

    Iron loss of the transformer includes two aspects. The first one is the hysteresis loss, when the alternating current goes through the transformer, the direction and magnitude of the magnetic lines through the transformer silicon steel sheet changes, causing friction among the molecules within the silicon steel sheet and heat is released, this process consumes part of the electricity. The other is eddy current loss during the working of isolation transformer. When the magnetic line of force goes through iron core, current will be induced on the plane vertical to the magnetic line of force, since the current forms a closed loop and becomes ring current which shapes an eddy, it is called eddy current. The existence of eddy current makes the core heat and consumes energy, this loss is called eddy current loss.

    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 20 kVA Isolation Transformer, 3 phase, 380V to 190V
    Exactly what I needed.
    We recently relocated to the USA from Europe. I have a machine with an EU power and so the voltage is not compatible. However after doing research, I saw that people had got it working using this product and so I tried it out. I found this isolation transformer to be a good value for my device.
    From: Roger | Date: 10/10/2019
    Was this review helpful? Yes No (0/0)
    Great step up and step down isolation transformer
    Great step up and step down isolation transformer. I am quite pleased with this product. Although it is a little heavy but then fit for purpose.
    From: Pierce Primm | Date: 14/02/2019
    Was this review helpful? Yes No (0/0)
    Completely soundless and odorless
    The isolation transformer performs just as I hoped it would. I use it in the US to run 220V European appliances on US 120V current. Completely soundless and odorless.
    From: Elzabeth | Date: 13/07/2018
    Was this review helpful? Yes No (0/0)
    Could this 20 kVA isolation transformer eliminate the disturbance of harmonics?
    I have added reactors to the input and output terminals of my equipment, and have not eliminated the disturbance of harmonics. Could this 20 kVA isolation transformer help me solve the problem?
    From: Tom Rosser | Date: 28/05/2018
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Dear friend, ATO isolation transformers are not only step up & step down transformers, but also belongs to the safe power source, which can prevent the transmission of some harmonics and protect the device.
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