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    5 kVA Isolation Transformer, Single Phase, 230V to 120V

    5 out of 5 based on 2 reviews | Write a review
    Lower cost 5 kVA isolation transformer, single phase, to use in alternating current (AC) 50Hz or 60Hz, step down the voltage 230V to 120V or step up 120V to 230V. Copper wire or aluminum wire for optional, IP20 protection grade enclosure, dry type natural air self cooling mode.
    30-day Returns
    Delivery date: 10-20 days

    5 kVA single phase isolation transformer for sale at affordable price, primary voltage 230V AC and secondary voltages 120V AC, working efficiency up to 95%, better dielectric strength and insulation resistance, lower noise, lower temperature rise, higher safety.
    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-DG5kVA
    • Capacity: 5kVA
    • Phase: Single phase
    • Winding Material: Aluminum/Copper wire (Optional)
    • Frequency: 50Hz/60Hz
    • Work Efficiency: ≥95%
    • Primary Voltage: 230V AC (optional: 110V/ 120V/ 208V/ 220V/ 240V)
    • Secondary Voltage: 120V AC (optional: 110V/ 208V/ 220V/ 230V/ 240V)
    • Weight: 58 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: Protective device to be installed in a 5 kVA isolation transformer

    1. Gas protection that reflects the internal faults of 5 kVA single phase 230V to 120V isolation transformer oil tank and oil surface reduction.
    2. Longitudinal differential protection or current fast-trip protection that reflects the interphase short circuit of isolation transformer winding and outgoing line, the single-phase grounding short circuit of neutral-point solid ground winding and outgoing line.
    3. Overcurrent protection that reflects the external interphase short circuit of step up/ dowm transformer and plays as the differential protection reserve of gas protection box (or current fast-trip protection).
    4. Zero-sequence current protection that reflects the external and internal grounding short-circuit of the 5 kVA isolation transformer in the neutral-point solid ground system.
      Overload protection that reflects the symmetrical overloading of the transformer.


    1-phase isolation transformer dimension

    Aluminium Wire Transformer Size

    Without Enclosure: a*b*c=240*230*260mm

    Mouting Size: D*E=180*160mm (aperture: 20*10mm)

    With Enclosure: A*B*C=300*440*500mm

    Copper Wire Transformer Size

    Without Enclosure: a*b*c=210*230*230mm

    Mouting Size: D*E=150*170mm (aperture: 18*8mm)

    With Enclosure: A*B*C=300*440*500mm


    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 5 kVA Isolation Transformer, Single Phase, 230V to 120V
    Used 5 kVA transformer to step up 120 volt to 220 volt
    I used this unit (5 kVA isolation transformer, single phase) for the Step Up since I bought something from a country that had 220 volts and here in the USA uses only 120 volts. My stereo had the lights on, but the speakers or sounds was not working. The xmas decor lights work, but it was dim. After plugging both to step up the 220 volts, radio/speakers work perfect and the xmas lights were super bright. Highly recommend.
    From: Russell Barbuto | Date: 17/10/2018
    Was this review helpful? Yes No (1/0)
    What is the output Hz?
    What is the output Hz of this 5 kVA single phase isolation transformer?
    From: Frank | Date: 19/06/2018
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Dear friend, whatever the input frequency is, if you are in a 60Hz area, it will be 60Hz. If you are in a 50Hz area, it will be 50Hz. Our isolation transformers transform the voltage only.
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