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    45 kVA 3-Phase Autotransformer, 380V to 220/200V

    Provide 3-phase autotransformer for sale online, ideal price. Power rating 45kVA, designed to step down high voltage 380 volt to 220/200 volt, used in AC circuit 50 Hz or 60 Hz, available self-cooling or wind-cooled. Winding of the dry type auto-transformer is copper or aluminum for selection, voltage customization is available, wide applications.
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    Delivery date: 6-12 days

    45 kVA three phase autotransformer is 50Hz/ 60Hz rated, whose function is step down high input voltage 380 volt to 220/200 volt output, other voltages can be customized. High performance copper/aluminum winding provides increased reliability and higher working efficiency.

    Applications: The 3-phase autotransformer can be used in CNC production equipment, SMT, printing machines, electrical discharge machines, automatic plug-in machines, precision measuring equipment, laser cutting machines, plastic molding machines, medical monitoring systems, PCB drilling machines, laboratory equipment, military use Instrumentation control center, etc.


    Model ATO-ASG45KVA
    Phase 3-Phase
    Capacity 45 kVA
    Input Voltage AC 380V
    Input Current 68A
    Output Voltage (Optional) AC 220V, 200V
    Output Current 118A (220V), 130A (200V)
    Frequency 50Hz / 60Hz
    Winding Material (Optional) Aluminum Wire, Copper Wire
    Cooling Method Self-Cooling or Wind-Cooling
    Working Efficiency ≥98%
    Protection Grade IP21
    Waveform Distortion No distortion (compared with output wave)
    Insulation Resistance ≥ 150MΩ
    Wiring Yn0
    Electrical Strength Power frequency sinusoidal voltage 3000V lasts for 1 minute, no breakdown and flicker
    Overload Protection Can withstand instantaneous 2 times the rated current
    Moisture-Proof Type (Optional) Open type, sealed type
    Ambient Temperature -20℃ ~ +45℃
    Altitude ≤ 2500m
    Relative Humidity 0-95%
    Noise ≤35dB (within 1 meter)
    Design Service Life 20 years
    Use Environment No explosion, rain and snow corrosion place, and no gas and conductive dust in the medium that can corrode metal and damage insulation
    Weight (Enclosure Included) 230 kg
    Dimension 600*550*700 mm


    • 3-phase autotransformer has enough power, the wiring is tight and neat, and does not skip turns. Coils adopt insulated H-class enameled wire, with low no-load current and low loss.
    • The 45 kVA dry-type autotransformer has built-in silicon steel sheet, which has good magnetic flux performance, high heat dissipation coefficient and low magnetic loss.
    • The autotransformer uses electrophoresis technology clamps, no burrs on the edges, rounded corners to prevent collisions, and not easy to corrode.
    • Tinned copper tube terminals and rail-type wiring ports are convenient for wiring and ensure that the power-on overload capacity is increased to the extreme.


    45 KVA 3-Phase Autotransformer Details

    45 kVA 3-Phase Autotransformer Schematic Wiring Diagram

    3-Phase Autotransformer Schematic Wiring Diagram

    Tips: Instructions to use the 45 kVA 3-phase autotransformer.

    • Determine the reasonable capacity of 3-phase autotransformer.

    First of all, you need to investigate the power supply voltage of the place where the electricity is to be used, the actual electricity load and the conditions of the place where it is located, and then choose the above items by referring to the technical data of 3-phase autotransformer nameplate one by one. Generally, 3-phase autotransformer capacity, voltage, current and environmental conditions should be considered comprehensively. The capacity should be selected based on the capacity, nature and use time of the power consuming equipment to determine the required load, so as to select the capacity of 3-phase autotransformer.

    In normal operation, 3-phase autotransformer should withstand a power load of about 75% to 90% of the transformer’s rated capacity.

    • Do not run the 3-phase autotransformer for long time under overload condition.

    Overload operation is that the specified 3-phase autotransformer exceeds the specified current value indicated on the nameplate. Overload operation increases the temperature of 3-phase autotransformer, promotes insulation aging, and reduces the service life. Therefore, 3-phase autotransformer is not allowed to operate under overload. In a special case, 3-phase autotransformer is allowed to run under overload in a short time. The allowable time is listed in user manual.

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