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Charles Marine Iso-G2 3.8 kVA Isolation Transformer

  • Output: 30 / 16 Amps, 120 / 240 Volt AC, Kilovolt Amps: 3.8 kVA
  • Input: 30 / 16 Amps, 120 / 240 Volt AC, Frequency: 50 / 60 Hz
  • Compact Alternative to Using Galvanic Isolator / Status Monitor Combination
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    70.45 Lbs.
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    Charles Marine Iso-G2 3.8 kVA Isolation Transformer


    • Provides reliable and affordable AC system protection and meets ABYC standards as a single-unit alternative to using a galvanic isolator / status monitor combination
    • Shoreline isolation transformer completely isolates input power from output power for improved safety and prevents galvanic current corrosion due to direct connection to AC shore power
    • Designed for 120 or 240 Volt input, 120, 120 / 240 (3 wire) or 240 Volt output and 50 or 60 Hz operation – providing maximum flexibility in a multitude of applications
    • Unit will operate on either 50 or 60 Hz and provides easy adaptation to European electrical systems
    • Power is transferred from the shore side electrical system to boat's electrical system by magnetic coupling – there is no direct electrical connection between earth-grounded shore AC power and boat's AC power
    • Shore grounding conductor is connected to a shield that is wound between the primary (shore) and secondary (boat) transformer windings
    • Terminal block included for easy connections
    • Unit can be mounted horizontally on deck or vertically on a bulkhead
    • Whisper-quiet operation
    • Corrosion resistant, convection-cooled enclosure meets NMEA 3R requirements
    • Ignition protected
    • Strain Relief Kit included
    • Designed and manufactured in USA
    • Marine UL listed, meets all ABYC and USCG requirements
    • 1-year limited warranty


    • Charles Marine Model No. 93-ISOG2/8-A
    • Kilovolt Amps: 3.8 kVA
    • Output Amperage: 30 / 16 Amps
    • Output Voltage: 120 / 240 Volt AC
    • Input Amperage: 30 / 16 Amps
    • Input Voltage: 120 / 240 Volt AC
    • Operating Frequency: 50 / 60 Hz
    • Operating Temperature: 32 - 122°F
    • Dimensions: 9.65" H x 10.5" W x 9" D
    • Approximate Weight (not shipping weight): 60 lbs

    For further details see Installation Instructions & Owner's Manual for this product

    Note: Overcurrent protection must be provided at time of installation by a circuit breaker on the primary (shore) supply circuit. A 2-pole circuit breaker is required for the shore power line going into the IsoG2. For 120 Volts, circuit breaker should be rated at 30 Amps, 3000 ampere interrupting capacity (AIC) and be of the long-time delay type. For 240 Volts, circuit breaker should be rated at 16 Amps and be of the long-time delay type.
    Boat wiring is a complex task that can pose shock, corrosion and other hazards if not done properly by trained, experienced personnel.

    Note: Charles Transformers are designed to work with either 50 Hz or 60 Hz, but they will not convert hertz from 50hz to 60hz or 60hz to 50hz.

    Documentation available at the following links:


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