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    3 kVA Isolation Transformer, Single Phase, 208V to 240V

    5 out of 5 based on 3 reviews | Write a review
    Dry type single phase 3 kVA isolation transformer for sale, with primary voltage 208V and secondary voltage 240V, other capacity and voltage can be customizable. Safe and reliable 1-phase isolation transformer to step up or step down voltage, insulating the electrical between the primary and secondary sides and isolates the circuit.
    30-day Returns
    Delivery date: 10-20 days

    Customized isolation transformer with 3kVA capacity, primary voltage 208V to secondary voltage 240V AC, various voltages of primary and secondary are available for your selection. 50Hz/60Hz frequency, CE, ISO certification, natural air self cooling, IP20 encapsulated enclosure for protection.


    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-DG3kVA
    • Capacity: 3kVA
    • Phase: Single phase
    • Winding Material: Aluminum/Copper wire (Optional)
    • Frequency: 50Hz/60Hz
    • Work Efficiency: ≥95%
    • Primary Voltage: 208V AC (optional: 110V/ 120V/ 220V/ 230V/ 240V)
    • Secondary Voltage: 240V AC (optional: 110V/ 120V/ 208V/ 220V/ 230V)
    • Weight: 50 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.


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

    800 VA-15 kVA single phase isolation transformer schematic diagram


    Single phase isolation transformer details

    Tips: No-load Current of the 3 kVA Isolation Transformer

    No-load current refers to the current running in the line terminal when a rated voltage with a rated frequency is applied to the terminal of a winding while other windings are open circuit. It's generally expressed by the percentage of the winding's rated current. So the reactive component of the no-load current is greater than the active component and a no-load current is essentially a reactive power, which is generally called as magnetic current. When the 3 kVA isolation transformer is running in no load, the output power is zero, however, a small part of active power will be absorbed from the power supply to compensate the power loss of the isolation transformer, and this part of power becomes heat and dissipates, namely the commonly said no-load loss.


    1-phase isolation transformer dimension

    Aluminium Wire Transformer Size

    Without Enclosure: a*b*c=192*160*220mm

    Mouting Size: D*E=140*120mm (aperture: 17*8mm)

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

    Copper Wire Transformer Size

    Without Enclosure: a*b*c=180*160*210mm

    Mouting Size: D*E=130*120mm (aperture: 17*8mm)

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


    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 3 kVA Isolation Transformer, Single Phase, 208V to 240V
    Question on maximum amperage
    it is okay to proceed in using 110V/120V voltage input locally even though the maximum amperage is only 15 amps?   Can you please confirm.
    From: Kristen | Date: 17/10/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    What you purchased is a 3kVA Frequency Converter, the input voltage is 110/120V. Then the maximum input current is I=P/U=3000/120=25.
    Considering the power factor of 0.8, the actual maximum current at full load may reach about 35A instead of 15A.
    Of course, the actual input current is related to the capacity of the load end. , the greater the load, the greater the current.
    Used this 3 kVA step up/down isolation transformer converting 220V (Europe) to 110V (USA)
    I have used this 3 kVA step up/down isolation transformer for about 6 months straight now, converting 220V (Europe) to 110V (USA) for the devices like a Dell Color Laserprinter, a Vizio 80" TV, and a Jura F9 coffee maker. So far it has held up very well. I highly recommend this product to anyone.
    From: James Kelley | Date: 17/10/2018
    Was this review helpful? Yes No (0/0)
    Transform 110V to 220V or 220V to 110V
    The isolation transformer arrived on time and exceeded my expectations for quality. It works perfect in the US with my European devices, transform 110V to 220V or 220V to 110V.
    From: Charlie Chisholm | Date: 18/07/2018
    Was this review helpful? Yes No (0/0)
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