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    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down
    Picture of 300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down

    300 kVA Three Phase Isolation Transformer, 480V to 400V, Step Up/Down

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    SKU: PH-T-SG300KVA
    $30,086.16
    ● 300 kVA 3-phase isolation transformer for power infrastructure and industrial plants. ● Stable voltage conversion between 480V and 400V; other voltages are customisable. ● Increased protection against electric shock through safe galvanic isolation. ● Built-in temperature alarm, triggers at 150°C for overtemperature protection. ● Aluminium or copper winding; open type or IP 24 enclosure; optional movable wheels. ● CE and ISO certified; 12-month warranty.
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    ⏱️ Delivery: 6-12 days
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    Overview

    The 300 kVA three-phase isolation transformer is engineered for large-scale industrial power infrastructure requiring stable voltage conversion and enhanced electrical safety. It supports step-down from 480V to 400V and step-up operation for flexible system integration. By providing effective electrical isolation, it improves protection against electric shock and ensures smooth, consistent power delivery for critical equipment. Multiple voltage configurations are available to meet diverse industrial and regional requirements.

    300 kVA three-phase isolation transformer feature

    Feature

    • Increased Electric Shock Protection Through Galvanic Isolation: Provides a full electrical break between the 480V primary supply and the secondary load.
    • Consistent, Smooth Voltage Transformation: Delivers stable, low-distortion voltage output under varying load conditions.
    • Built-In Temperature Alarm: Monitors internal temperature continuously and triggers an alarm at 150°C, prompting operators to suspend the transformer before winding or insulation damage occurs.
    • Wide Voltage Customisation: Beyond the standard 480V/400V configuration, both primary and secondary voltages are independently customisable across a broad range of standard values.
     

    1. Details

      1. Input Voltage Indicator: Indicates the presence and status of the input power supply.
      2. Output Current Indicator: Displays the operating current on the output side of the transformer.
      3. Temperature Controller: Monitors and regulates the transformer temperature to ensure safe operation.
      4. Input Voltage Digital Display Screen: Provides real-time digital readings of the input voltage.
      5. Output Current Digital Display Screen: Shows accurate digital measurements of the output current.
      6. Output Voltage Digital Display Screen: Displays real-time output voltage values for monitoring system performance.
      7. Alarm: Alerts when the transformer temperature or operating condition exceeds safe limits.
      8. Output Voltage Indicator: Indicates the output voltage status and presence.
    150 kVA to 300 kVA three-phase isolation transformer details

    300 kVA Three-phase Isolation Transformer Schematic Diagram

    150 kVA to 300 kVA three-phase isolation transformer schematic diagram

    300 kVA Three-phase Isolation Transformer Installation Dimensions

    150 kVA to 300 kVA three-phase isolation transformer installation dimensions

     

    Aluminium Wire Transformer Size Copper Wire Transformer Size
    Open Type: a*b*c=1060**450*955 (mm) Open Type: a*b*c=990*410*855 (mm)
    Mounting Size: d*e=600*400 (mm) Mounting Size: d*e=600*400 (mm)
    Protected Type: A*B*C=1300*750*1600 (mm) Protected Type: A*B*C=1300*750*1600 (mm)
    Specs
    Basics
    Phase 3-phase
    Capacity 300 kVA
    Weight-Aluminium Winding Open type: 740 kg
    Protected type: 890 kg
    Weight-Copper Winding Open type: 930 kg
    Protected type: 1005 kg
    Technical Parameters
    Primary Voltage 480V (Optional: 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    Secondary Voltage 400V (Optional: 190V/ 208V/ 220V/ 230V/ 240V/ 380V/ 400V/ 415V/ 480V)
    Frequency 50 / 60 Hz
    Winding Material Aluminium / Copper Wire (Optional)
    Work Efficiency ≥ 95%
    Insulation Resistance ≥ 50 MΩ
    Dielectric Strength 3000V AC / 1 min
    Noise < 35~65 dB (at 1 m)
    Insulation Grade Class H
    Wiring Mode Dyn11
    Cooling Mode Dry-type, natural air cooling
    Overload Capacity Allow more than 1.2 times the rated load to work for up to 4 hours
    Enclosure Protection Grade IP 22
    Certificate CE, ISO
    Warranty 12 months
    Working Environment
    Ambient Temperature −15 °C ~ +40 °C
    Relative Humidity ≤ 90% RH, non-condensing
    Altitude < 1000 m, free of corrosive gas and conductive dust

    Note:

    1. The transformer can only convert voltage, and CANNOT convert frequency.
    2. The transformer CANNOT convert 1-phase voltage to 3-phase voltage.
    3. Input/output voltage, power rating, and whether a shell for all transformers can be customized to meet clients' requirements.
    Application
    Three-phase isolation transformer for metro and rail transit

    Metro & Rail Transit

    Three-phase isolation transformer for manufacturing and machine shops

    Manufacturing & Machine Shops

    Three-phase isolation transformer for commercial buildings

    Commercial Buildings

    Three-phase isolation transformer for oil, gas and petrochemical

    Oil, Gas & Petrochemical

    FAQ

    Q1. How does "consistent, smooth voltage transformation" benefit high-capacity industrial installations?

    At 300 kVA, even small voltage fluctuations on the secondary supply can affect the performance of large CNC machines, industrial drives, and process control systems. Consistent, smooth voltage transformation means the secondary output voltage remains stable and low in harmonic distortion across the load range — from light load to full capacity — reducing the risk of nuisance trips, control errors, and premature equipment wear caused by poor power quality. 

    Q2. What site preparation is required for installing a 300 kVA isolation transformer?

    At 300 kVA, site preparation requirements are more substantial than for smaller ratings. The transformer's physical weight (dependent on winding material and enclosure type) requires a reinforced floor surface or dedicated plinth, and adequate ventilation clearance around the enclosure must be maintained to support dry-type air self-cooling. The built-in temperature alarm should be wired to a local panel or building management system so that overtemperature alerts are actioned promptly. Electrical installation must be carried out by a qualified electrician in accordance with local wiring regulations. Input and output cable sizing should account for the full 300 kVA continuous rating with appropriate derating for ambient temperature and installation method.

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