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    75 kVA Isolation Transformer, 3 phase, 480 Volt to 220 Volt

    5 out of 5 based on 1 reviews | Write a review
    Safety 75kVA isolation transformer come in a NEMA 3R enclosure, which is available in the circuit of AC 50Hz/60Hz and convert 3 phase voltage 480V to 220V and 220V to 480V version is optional , low noise, lower temperature rise, higher efficiency.
    30-day Returns
    Delivery date: 10-20 days

    Step up or step down isolation transformer is manufactured direct sale and fully compliant with reduced low voltage regulations, is a is a non-ventilated transformer rated for hazardous locations as well as harsh industrial environments.

    75 kVA Isolation Transformer Features

    • 3-phase unit with 75 kVA power rating.
    • Primary voltage of 480V AC on the primary side and secondary voltage of 230V AC on the secondary side.
    • enclosure is IP 24 protection grade.
    • Better protection, high quality workmanship.


    Basics Model ATO-SG75KVA
    Phase 3 phase
    Capacity 75 kVA
    Weight of Aluminium Wire Transformer Open type: 312kg
    Protected type: 367kg
    Weight of Copper Wire Transformer Open type: 310kg
    Protected type: 358kg
    Technical Parameters Primary Voltage 480V (Optional: 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    Secondary Voltage 220V (Optional: 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

    60-100 kVA 3 phase isolation transformer details

    75 kVA Isolation Transformer Installation Dimension

    60kVA 100kVA isolation transformer dimension

    Aluminium Wire Transformer Size Copper Wire Transformer Size
    Open type: a*b*c=620*350*600mm Open type: a*b*c=560*360*530mm
    Mouting size: d*e=420*200mm Mouting size: d*e=380*210mm
    Protected type: A*B*C=600*1050*980mm Protected type: A*B*C=550*950*930mm

    Tips: Functions of ATO 3 phase isolation transformer

    The main function of three phase isolation transformer on is to fully insulate primary and secondary electricity and circuit. In addition, its iron core has great ability of high-frequency clutter rejection with the features of high-frequency and great loss. Isolation transformer commonly known as safety transformer is usually used to isolate high-frequency clutter from entering control loop.
    Isolation transformer is designed for personal safety in the use, maintenance and commissioning of certain electrical appliance. Taken fixing a color TV as example, the power supply of the color TV is directly rectified into machine, so the chassis of machine could be charged. If a maintenance man cursorily touches this part circuit, he will get an electric shock that endangers his personal safety. In the process of inspection and testing, if the connection between instrument grounding and chassis may cause power supply short-circuited, resulting in the damage to transistors, integrated circuits and test equipment inside machine. Therefore, 3 phase isolation transformer should be used for the maintenance of certain household appliances.

    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 75 kVA Isolation Transformer, 3 phase, 480 Volt to 220 Volt
    Shell rating of 75kVA isolation transformer
    Can you proivde isolation transformer with enclosure type: NEMA 4X FFT2?
    From: Tcosgrove | Date: 15/07/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    No, our transformer cannot reach enclosure type: NEMA 4X FFT2, and the outdoor rainproof enclosure can only reach IP24.
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