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Victron Autotransformer 120/240V - 100A

Balances split-phase loads, integrated ground relay, 100A breaker


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DESCRIPTION

Victron 100A Autotransformer: Precision Voltage Conversion and Split-Phase Balancing for Critical Power Systems

Engineered for Reliable Step-Up, Step-Down, and Load Balancing in 120/240V Applications

The Victron 100A Autotransformer is a robust, toroidal transformer designed to solve the challenges of split-phase power distribution. In systems where 120V and 240V loads coexist, unbalanced currents can severely limit usable capacity. This unit actively balances the load across both legs, enabling you to draw the full rated power from your supply—whether it’s a generator, grid connection, or inverter setup.

By creating a new neutral point, the autotransformer absorbs current differences between the two 120V legs. This means a 30A 120/240V supply can deliver its full 7.2kVA potential, rather than being restricted to as little as 4.8kVA due to imbalance. For installers and system designers, this translates to fewer overload trips, better utilisation of existing infrastructure, and a more stable power environment for sensitive equipment.

How It Solves Real-World Power Problems

In typical mobile, marine, or off-grid installations, 120V appliances like hairdryers, washing machines, or air conditioners can draw heavily from one leg while the other remains lightly loaded. Without balancing, the supply breaker may trip prematurely, even though total power draw is well below the theoretical maximum. The Victron Autotransformer eliminates this bottleneck, allowing dynamic redistribution of current so that both legs operate efficiently.

This capability is particularly valuable when using a single 240V inverter instead of stacking two 120V units. A stacked pair of 120V 3kVA inverters limits each leg to 25A regardless of load distribution. In contrast, a 240V 5kVA inverter paired with this autotransformer can supply up to 38.5A on one leg if the other draws only 3.5A—offering greater flexibility and often reducing equipment costs.

Built-In Safety and Protection Features

Safety is integral to the design. An integrated ground relay ensures the neutral is properly bonded when operating in inverter mode, which is essential for the correct function of Ground Fault Circuit Interrupters (GFCIs). The relay is controlled directly by a compatible Victron Multi or Quattro inverter/charger, simplifying installation and compliance.

Thermal protection guards against overheating: if internal temperatures rise beyond safe limits, the unit disconnects automatically. Reset is manual, prompting a check of ventilation and load conditions before resuming operation. The 100A two-pole circuit breaker provides additional overcurrent protection on the input side.

Key Features

  • Toroidal transformer design for high efficiency and low noise
  • Continuous neutral current rating of 28A at 40°C, with 32A for 30 minutes
  • Integrated ground relay for seamless inverter neutral bonding
  • Manual-reset thermal protection prevents damage from overload
  • Robust aluminium enclosure with IP21 protection rating
  • Screw terminals accept up to 35mm² (AWG 2) cable for secure, low-resistance connections
  • Compact footprint: 425 x 214 x 110mm, weight 13.5kg

Applications Across Mobile, Marine, and Off-Grid

This autotransformer is an essential component for any split-phase system where load balance cannot be guaranteed. Typical use cases include:

  • RV and caravan power systems with a mix of 120V and 240V appliances
  • Marine electrical panels requiring stable split-phase supply from a single inverter
  • Off-grid cabins or tiny homes using generators or inverters as primary power sources
  • Backup power setups where generator capacity must be fully utilised
  • Industrial or commercial mobile power carts

Whether you’re upgrading an existing Victron installation or designing a new system, the 100A Autotransformer provides the balancing capability needed to maximise available power and protect connected equipment.

Installation-Ready Design

The unit ships with clear wiring diagrams and features accessible screw terminals, dual cable glands for secure cable entry, and mounting feet for fixed installation. LED indicators on the front panel provide at-a-glance status for power, ground relay engagement, and temperature warnings, aiding commissioning and troubleshooting.

For systems requiring step-up conversion from 120V to 240V, the autotransformer can be configured accordingly, adding versatility to its split-phase balancing core function.

Maximise Your Power System’s Potential

Equip your installation with the Victron 100A Autotransformer to eliminate load imbalance limitations and ensure reliable, full-capacity operation. Order today to build a more resilient and efficient power system.


SKU: VIC-ITR000100101

SPECIFICATIONS

Specifications

Input/Output Voltage120 / 240 V
Input Circuit Breaker100 A, Two Pole
Frequency50/60 Hz
Maximum 240 V Feed Through Current100 A
Neutral Current, 30 Min32 A (3800 VA)
Neutral Current, Continuous28 A @ 40 °C / 100 °F
Transformer TypeToroidal
Electrical TerminalsScrew Terminals 35 mm² / AWG 2
EnclosureAluminium
Protection CategoryIP21
SafetyEN 60076
Weight13.5 kg
Dimensions (H x W x D)425 x 214 x 110 mm

SKU: VIC-ITR000100101
Barcode: 8719076022428
Model #: ITR000100101
MPN: ITR000100101

WARRANTY

Victron Energy Limited Warranty Policy

Victron Energy warrants its products to be free from defects in workmanship and materials for a period of 5 years from the date of purchase by the end user, with a maximum of 66 months from the Victron Energy invoice date. Exceptions on this are: lead acid batteries; 2 years from date of purchase by the end user, with a maximum of 30 months from the Victron Energy invoice date, Lithium-ion batteries; 3 years from date of purchase by the end user. In addition to this proof of correct battery usage is required when making a battery warranty claim.

During this period, Victron Energy will, at its option, repair or replace the defective product free of charge. The warranty does not include performing or reimbursing de‐installation, transportation and re‐installation. This warranty will be considered void if the unit has suffered any physical damage or alteration, either internally or externally, and does not cover damages arising from improper use like: • Reverse of battery polarity. • Inadequate connection. • Mechanical shock or deformation. • Contact with liquid or oxidation by condensation. • Use in inappropriate environment (dust, corrosive vapor, humidity, high temperature, biological infestation...). • Breakage or damage due to lightning. • Connection terminals and screws destroyed or other damages, like overheat, due to insufficient tightening. • For any electronical breakage except due to lightning (reverse polarity, over‐voltage due to external cause), the state ofthe internal control diode and of the inputs/output X and Y capacitors determine the warranty.

This warranty will not apply where the product has been misused, neglected, improperly installed, or repaired by anyone else than Victron Energy or one of its authorized Qualified Service Partners. In order to qualify for the warranty, the product must not be disassembled or modified.

Repair or replacement are our sole remedies and Victron Energy shall not be liable for damages, whether direct, incidental,special, or consequential, even caused by negligence or fault.

Victron Energy owns all parts removed from repaired products. Victron Energy uses new or reconditioned parts made by various manufacturers in performing warranty repairs and building replacement products. If Victron Energy repairs or replaces a part of a product, its warranty term is not extended. In case of replacement the new component has a warranty of 6 months, without effect on the initial warranty period. All remedies and the measure for damages are limited to the above. Victron Energy shall in no event be liable for consequential, incidental, contingent orspecial damages, even if having been advised of the probability of such damages. Any and all other warranties expressed or implied arising by law, course of dealing, course of performance, usage of trade or otherwise, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are limited in duration to a period of two (2) years from the date of purchase.

Life Support Policy As a general policy, Victron Energy, does not recommend the use of any of its products in life support applications where failure or malfunction of the Victron Energy's product can be reasonably expected to cause failure of the life support device or to significantly affect its safety or effectiveness. Victron Energy does not recommend the use of any of its products in direct patient care. Victron Energy will not knowingly sell its products for use in such applications unless it receives in writing assurances satisfactory to Victron Energy that the risks of injury or damage have been minimized, the customer assumes all such risks, and the Liability of Victron Energy is adequately protected under the circumstances.

As a product requires service, it must be brought back to the place of purchase. In case no contact can be taken with the merchant, or if he is either unable or not allowed to provide service, direct contact should be taken with Victron Energy.

Warranty on Repairs The warranty period on products or on printed circuits boards repaired by Victron Energy as well as on printed circuit boards for replacement is 6 months from delivery by Victron Energy.

Transport It is the responsibility of the sender to sufficiently package these products. The transport must be organized in a way to avoid any damage, especially when a single unit or heavy unit is sent.

Severability If a part of the terms and conditions set out above is held invalid, void or unenforceable due to any particular national or international legislation, it shall not affect other parts of the terms and conditions remaining.

For Australia only Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

Exotronic provides high-quality products and solutions tailored for B2B and commercial customers, including commercial businesses, caravan manufacturers, marine electricians, OEMs, as well as emergency services, and more.

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