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

    3-phase autotransformer has 1 kVA rated capacity, for step down the voltage 380V to 220V/200V, current input 1.5A, output 2.6A/2.8A, frequency 50/60 Hz, electromagnetic induction. The primary and secondary windings of dry type auto transformer are insulated from each other, stable output, low price.

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

    3-phase step down autotransformer for sale, good price. Rated capacity 5kVA, input voltage 380V (current 13A), output voltage 220V/200V (current 14A), frequency 50/60 Hz, copper/aluminum wire for selection. Dry type auto transformer, electromagnetic induction, the primary and secondary windings are insulated separately.

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

    Buy dry type autotransformer at affordable price online. Power rating 15kVA, steps down the input voltage 3-phase 380V to 220V/200V output, input current 23A, output 39/43A, AC circuit 50Hz or 60 Hz, optional copper/aluminum wire. Dry type auto transformer supports self-cooling or wind-cooled, F insulation class winding.

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

    3-phase autotransformer from professional manufacturer. Capacity rating 25kVA, designed to step down high voltage 380 volt to 220/200 volt, applicable AC circuit 50 Hz or 60 Hz, self-cooling or wind-cooled. Dry type auto transformer has copper/aluminum wire winding for selection, 98% high efficiency, competitive price.

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

    Manufacturer price 3-phase autotransformer for sale online. Rated power capacity 30 kVA, primary input voltage 380 volts, secondary output voltage 220V/200V, AC circuit 50/60 Hz, optional copper/aluminum winding, supports self/wind-cooled, open type and sealed type versions are available.

    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.

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

    3-phase autotransformer uses copper or aluminum winding, rated capacity 75 kVA, steps down the primary voltage 380V to secondary 220/200V, frequency 50/60 Hz, self-cooling or wind-cooled. Winding of the dry type auto-transformer has ≥98% high efficiency, other input/output voltages are customizable.

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

    ATO dry-type autotransformer for sale, economical price. Function is step down the input voltage 3-phase 380V to 220/200V output, power rating 100 kVA, rated frequency 50/60 Hz, winding material copper/aluminum, cooling mode self/wind-cooled, primary and secondary windings are isolated with each other.

    An autotransformer is a transformer with only one winding, that is, the output and input share a set of coils. The definition of coupling in auto coupling is electromagnetic coupling. When an autotransformer is used as a step-down transformer, a part of the turns are drawn from winding as the secondary winding. When an autotransformer is used as a step-up transformer, the applied voltage is only applied to a part of the turns of winding.
    According to structure, the autotransformer can be divided into the variable type and constant type. The common power phase numbers are 3-phase and single-phase. In step-down starters, the transformation ratio of an autotransformer is fixed, while the transformation ratio of a contact voltage regulator is variable. Compared with general transformers of the same capacity, autotransformers have the advantages of simple structure, fewer materials, small size, and low price.

    How Does an Autotransformer Work?

    The working principle of autotransformer and construction is similar to that of conventional two-winding transformers. However, it differs in the way in which the primary and the secondary are interrelated. In a two-winding transformer, primary and secondary are only magnetically linked by a common core but are completely insulated from each other. But in the case of autotransformers windings are connected electrically as well as magnetically.Autotransformers working principle

    The circuit diagram of an autotransformer is shown on the right. When the single-phase AC supply is connected between A and D terminals and output is taken from C and E terminals, this autotransformer will operate as a step-down transformer.

    What are the Features of 3 Phase Autotransformer?

    • The three phase auto transformer is used in applications where primary and secondary isolation is not required. It has the advantages of small size, low consumables and high efficiency.
    • Fundamentally autotransformer is designed to reduce cost by eliminating a coil and has the function of a normal transformer, which means it has the function of raising or lowering circuit voltage, isolating and lowering impedance.
    • In addition, autotransformers can be made into AC regulators to flexibly change the output voltage for laboratory use.
    • The autotransformer power supply method is very suitable for the power supply of large-capacity load, and the interference to the communication line is less, thus it is widely used by passenger lines as well as heavy-duty freight railroads.

    Step Up & Step Down Autotransformer Advantages

    • Less consumption of materials and low cost. As the amount of silicon steel sheet and copper wire used in the autotransformer is related to the rated induced potential and rated current of the winding, the material consumption is also reduced, and the cost is also low.
    • Less loss and high benefit. Due to the reduction in the amount of copper wire and silicon steel sheet, at the same current density and magnetic flux density, the copper loss and iron loss of the autotransformer are lower than those of the double-winding transformer, so the benefit is higher.
    • Easy to transport and install. It is lighter in weight, smaller in size and smaller in footprint than a dual-winding transformer of the same capacity.

    Autotransformer vs. Isolation Transformer

    Autotransformers and isolation transformers are two different forms of transformers that work on the same principle. Both use an energy conversion between the alternating magnetic field and the alternating current in the coil to convert the voltage. So what's the difference between them? The following lists six major differences between autotransformers and isolation transformers.

    • Coil structure
    • Coil connection methods
    • Operation mode
    • Impedance voltages and short circuit currents
    • Power quality
    • Volumes and costs

     Autotransformer vs. isolation transformer


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