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    20 kVA Isolation Transformer, single phase, 240V to 208V

    The 20 kVA capacity transformer from ATO is safety and isolation single phase transformer, it can step down 240 volt input voltage to output 208 volt, can step up 208 volt to 240 volt as well. This good price isolation transformer provides enhanced electrical isolation between the line supply and the application.
    Delivery date: 6-20 days

    ATO-DG20KVA single phase isolation transformer is 20 kVA capacity, applies to AC 50/ 60Hz, convert 240V voltage to 208V voltage. It has natural air self cooling mode, primary and secondary windings are separated by aluminum shield, long life span and high efficiency.

    20 kVA Isolation Transformer Specifications

    Model ATO-DG20kVA
    Phase Single phase
    Capacity 20kVA
    Primary Voltage 240V AC (optional: 110V/ 120V/ 208V/ 220V/ 230V)
    Secondary Voltage 208V AC (optional: 110V/ 120V/ 220V/ 230V/ 240V)
    Frequency 50Hz / 60Hz
    Winding Material Aluminum/Copper wire (Optional)
    Work Efficiency ≥95%
    Insulation Resistance ≥50 MΩ
    Electrical Strength 2000V AC/1 min
    Noise ≤35dB (1 meter)
    Insulation Grade Grade B (130℃), Grade F (155℃), Grade H (180℃)
    Cooling Method Natural or air cooling
    Overload Capacity Allow more than 1.2 times rated load to work for up to 1 hour
    Induced Overvoltage Withstand Test 125Hz/800V/min
    Transformation Ratio <3%
    Air Carrying Current <6%
    Impedance Voltage about 6%
    Total Losses 10%
    Certification CE, ISO
    Temperature -15℃~+45℃
    Humidity ≤90%RH, without condensation
    Altitude <2000m, non corrosive gas and conductive dust
    Enclosure Protection Grade IP20
    Warranty 12 months
    Weight of Aluminium Wire Transformer Open type: 92kg
    Protected type: 120kg
    Weight of Copper Wire Transformer Open type: 115kg
    Protected type: 141kg


    Transformer can only convert voltage and CANNOT convert frequency.
    Transformer CANNOT convert single phase voltage to 3 phase voltage.
    Support voltage customization, various specifications customization.

    Single Phase Isolation Transformer Schematic Diagram
    DG isolation transformer schematic diagram
    20 kVA Isolation Transformer Dimension

    1-phase isolation transformer dimension

    Aluminium Wire Transformer Size Copper Wire Transformer Size
    Open type: a*b*c=330*300*470mm Open type: a*b*c=300*370*345mm
    Mouting size: D*E=170*160mm (aperture: 20*10mm) Mouting size: D*E=210*190mm (aperture: 20*10mm)
    Protected type: A*B*C=420*610*610mm Protected type: A*B*C=420*610*610mm

    Tips: What are the differences among a transformer, a voltage stabilizer and a voltage regulator?

    A transformer can control the unstable voltage in a certain voltage range and protect the equipment from being damaged. A voltage regulator converts a specific voltage to the needed voltage of an equipment, each equipment should be equipped with a voltage regulator to prevent from burning out equipment caused by excessive voltage change. A voltage stabilizer is used to stabilize the voltage. Generally, a voltage regulator is a kind of test equipment that can change the voltage, while a voltage stabilizer can only adjust the voltage in a certain range. The voltage regulator can adjust the high voltage, but can’t insulate it, while the transformer is generally used to isolate, such as the isolation transformer, the transformer can be used to step up or step down the voltage. A voltage stabilizer is just a way to stabilize the voltage.

    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.

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