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    8 kVA Isolation Transformer, Single Phase 120V

    5 out of 5 based on 3 reviews | Write a review
    8 kVA dry type isolation transformer for sale, single phase, 120 volt AC voltage, 1:1 ratio between the primary and secondary windings, other voltage are available for choice. Shielded isolation transformer offers 100% isolation from the input AC line, to protect against electric shock between the ground and energized conductors.
    30-day Returns
    Delivery date: 10-20 days

    Cheap price isolation transformer is single phase power transformer for 50/ 60Hz AC circuit, with 8 kVA power rating, primary and secondary voltage of 120V, IP20 protection class, H insulation class, LCD display voltage.
    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-DG8kVA
    • Capacity: 8kVA
    • Phase: Single phase
    • Winding Material: Aluminum/Copper wire (Optional)
    • Frequency: 50Hz/60Hz
    • Work Efficiency: ≥95%
    • Primary Voltage: 120V AC (Optional: 110V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    • Secondary Voltage: 120V AC (Optional: 24V/ 36V/ 48V/ 110V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    • Weight: 82 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: Basic principle of single phase isolation transformer gas protection

    Gas protection shows the gas quantity and oil flow velocity in a fault. When the single phase isolation transformer internal fault occurs, the local high temperature at the fault point increases the oil temperature of the transformer and expands the volume, air in the oil is discharged to form an ascending gas. If an arc is generated at the fault point, the isolation transformer oil and insulation materials will decompose large quantities of gas, which flow from the tank to the oil conservator. The more serious the fault is, the more gas it produces, and the faster flowing speed of the oil to the oil conservator. The gas quantity and oil flow velocity can directly reflect the character and severity of single phase transformer faults, so light gas acts on the signal when the gas quantity and oil flow velocity are small. When the fault is rather serious, the oil flow velocity is fast and heavy gas protection acts immediately on a tripping operation.


    1-phase isolation transformer dimension

    Aluminium Wire Transformer Size

    Without Enclosure: a*b*c=240*270*260mm

    Mouting Size: D*E=180*200mm (aperture: 20*10mm)

    With Enclosure: A*B*C=380*530*560mm

    Copper Wire Transformer Size

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

    Mouting Size: D*E=180*190mm (aperture: 20*10mm)

    With Enclosure: A*B*C=380*530*560mm


    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 8 kVA Isolation Transformer, Single Phase 120V
    Which one should i choose?
    I am looking at a unit that can convert 230VAC 50Hz to 120VAC 60Hz with an output of at least 6KVA.

    I was looking at two P/N's, ATO-T-DG8KVA and HZ-50-1110, and wanted to see if either of this would be an option to do so.
    From: Noah | Date: 05/02/2024
    Was this review helpful? Yes No (0/0)
    ATO Responded
    If you want to convert 230VAC 50Hz to 120VAC 60Hz with a load capacity of 5.75KVA,

    Since there are inductive loads such as induction motors and warm winter air conditioners in the load, we recommend a 15kVA Single Phase 230v 50Hz to 120v 60Hz Converter with a rated output current of 125A.
    Great transformer, heavy duty!
    Heavy Duty and worked like a charm. I have a 220V appliance from Japan and it works with no issues with this transformer, step down 220V to 110V. I can only recommend it to anyone!
    From: Jonas | Date: 13/05/2019
    Was this review helpful? Yes No (0/0)
    Need an apprxomate delivery date
    I need an apprxomate delivery date for this single phase 8 kVA Isolation Transformer (120V to 208V).
    From: Rodney | Date: 01/04/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Approx 10-12 days after payment is made.
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