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    1 kVA Isolation Transformer, Single Phase, 240V to 120V

    5 out of 5 based on 3 reviews | Write a review
    Customizable 1 kVA isolation transformer is a single phase transformer with lower cost, step up or step down the AC voltage between 240 volt and 120 volt, optional enameled copper wire or aluminum wire. Encapsulation and IP20 protection grade of the enclosure protect the transformer from dust, moisture and provide extra shock and vibration resistance.
    30-day Returns
    Delivery date: 10-20 days

    Dry type single phase isolation transformer with 1kVA capacity, is design to use in AC circuit 50Hz or 60 Hz, transform 240V primary voltage to 120V secondary voltage. Temperature resistance of 180°C, lower noise, better insulation.
    Isolation transformers serve as secure power sources and are commonly employed in machine repair and maintenance to provide protection, prevent damage from lightning, and filter out electrical disturbances. Here is a demonstration video of a single phase isolation transformer.


    Single phase isolation transformer has a reasonable design, is safe and reliable, and has no waveform distortion, completely insulates the electrical between the primary and secondary sides and isolates the circuit. It is widely used in transportation, construction sites, printing, CNC machine tools, docks, precision equipment, industrial mining enterprises and tunnels for power transmission and distribution to solve voltage conversion problems.

    Basic Specifications

    • Model: ATO-DG1kVA
    • Capacity: 1kVA
    • Phase: Single phase
    • Winding Material: Aluminum/Copper wire (Optional)
    • Work Efficiency: ≥95%
    • Primary Voltage: 240V AC (optional: 110V/ 120V/ 208V/ 220V/ 230V)
    • Secondary Voltage: 120V AC (optional: 110V/ 208V/ 220V/ 230V/ 240V)
    • Weight: 29 kg

    Technical Specifications

    • Cooling Mode: Natural or air cooling
    • 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℃)
    • Overload Capacity: Allow more than 1.2 times rated load to work for up to 1 hour
    • Induced Overvoltage Withstand Test: 125Hz/800V/min
    • Impedance Voltage: About 6%
    • Total Losses: 10%
    • Certification: CE, ISO
    • Temperature: -15℃~+45℃
    • Enclosure Protection Grade: IP20
    • Warranty: 12 months


    • Heat dissipation holes and fans: The enclosure is a multi-hole design, the back of the transformer installed cooling fan, can be strong and effective heat dissipation, reduce the temperature of the machine, to better protect the internal components.
    • Two-color indicator: Input and output using LCD digital display meter, equipped with indicators to accurately display the voltage when working state.
    • High temperature resistant enameled wire: High temperature resistance up to 180℃, good insulation and not easy to aging, prolong the service life of the machine.
    • Oriented silicon steel sheet: Cold rolled oriented silicon steel sheet is used, which has the advantages of good heat dissipation coefficient, low core loss and good magnetization characteristics.
    • Long-term continuous work: With a wide range of applicable loads, can withstand transient overload, can work continuously for a long time.
    • Universal casters: Isolation transformer with four universal wheels, easy to move, can rotate 360 degrees, more energy-saving when pushing.
    • Enclosure: With strong enclosure to effectively prevent dust and protect the internal transformer.


    Schematic Diagram

    800 VA-15 kVA single phase isolation transformer schematic diagram


    Single phase isolation transformer details

    Tips: Why step up & step down isolation transformer can't convert the DC voltage?

    Alternating current (AC) refers to the current whose voltage and current changes the magnitude and direction with the time. Alternating current is produced by alternator. During the power generation, multiple pairs of magnetic poles are evenly distributed on a circle at a certain angle, so that each coil cuts the magnetic line in power generation. Due to the many pairs of magnetic poles, the voltage and current generated from cutting the magnetic lines of each pair of poles changes according to the string rule, the stable current is thereof produced.

    Operational principle of the transformer is the electromagnetic induction principle. When the primary of a step up & step down isolation transformer connects the AC, an alternating magnetic field is generated in the iron core, the secondary out induces the AC and the induced electromotive force is proportional to the number of turns. If the primary of a transformer connects an DC, the magnetic field produced in the iron core is constant, as a result, no electromotive force is induced in the winding of secondary out, the transformer action will not affect.


    1-phase isolation transformer dimension

    Aluminium Wire Transformer Size

    Without Enclosure: a*b*c=150*170*180mm

    Mouting Size: D*E=120*125mm (aperture: 15*8mm)

    With Enclosure: A*B*C=250*360*420mm

    Copper Wire Transformer Size

    Without Enclosure: a*b*c=150*160*180mm

    Mouting Size: D*E=120*115mm (aperture: 15*8mm)

    With Enclosure: A*B*C=250*360*420m


    360 Days warranty

    Thank you for buying industrial automation products on, all products sold by ATO and the partner cover a 360-days-warranty, effective from the date of receiving the products.

    What is covered?

    ATO is responsible for providing free spare parts, free technical support to assist the customer to repair the defective products until the problem is solved.

    What is not covered?

    • Product purchased from anyone other than ATO store or a ATO authorized reseller.
    • Expendable parts.
    • Routine cleaning or normal cosmetic and mechanical wear.
    • Damage from misuse, abuse or neglect.
    • Damage from use of parts other than ATO approved.
    • Damage from use outside the product’s usage or storage parameters.
    • Damage from use of parts not sold by ATO.
    • Damage from modification or incorporation into other products.
    • Damage from repair or replacement of warranted parts by a service provider other than a ATO authorized service provider.
    • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
    Existing reviews of 1 kVA Isolation Transformer, Single Phase, 240V to 120V
    Can you provide a 1-phase isolation transformer with larger capacity?
    Can you provide a 1-phase isolation transformer with larger capacity?
    From: Fraundorf | Date: 17/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can and can customize voltages as well if needed. Just email us with required specs, and we shall provide technical and commercial quotes.
    About your one-phase isolation transformer
    For your 1-phase, isolation transformer can you provide L, L, N, G output config?
    From: Sheela | Date: 04/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can. Just confirm with us by email after ordering.
    Can 1kVA single phase isolation transformer modify the input and output voltage?
    Is the output/input voltage of the 1kVA single phase isolation transformer set at the factory, or can it be changed to other values?
    From: Calvin | Date: 03/03/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The input/output voltage of the 1kVA single phase isolation transformer is an option selected at the factory and cannot be modified on site.
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