Description
xVictron Energy Autotransformer 120/240V 100A — ITR000100101
The Victron Energy Autotransformer 120/240V 100A is a split-phase voltage conversion unit designed for off-grid and marine systems that require both 120V and 240V AC outputs from a single-phase source. It is suited to professional installers working on North American split-phase systems, RV installations, and vessels where dual-voltage distribution is required.
Key Features
- Converts between 120V and 240V split-phase AC, allowing a single inverter to supply both voltage levels simultaneously.
- Rated at 100A continuous current, supporting high-load applications across both output legs.
- Passive autotransformer design with no active electronics, resulting in low losses and high thermal reliability.
- Compact and robust enclosure with a unit weight of 12.4 kg, suitable for fixed installation in marine, vehicle or off-grid cabinet builds.
- Compatible with Victron Quattro and MultiPlus inverter/chargers operating on 120V or 240V single-phase AC output.
- Balances unequal loads across the two 120V legs, reducing neutral current and protecting connected equipment.
Product Overview
An autotransformer differs from an isolation transformer in that it shares a common winding between primary and secondary, making it more compact and efficient for voltage splitting rather than galvanic isolation. In a North American split-phase system, 240V is derived from two 120V legs that are 180 degrees out of phase. The Victron Autotransformer takes a 240V input and provides two balanced 120V legs, or takes a 120V input and steps up to 240V, depending on how it is wired. This makes it a practical solution when a Quattro or MultiPlus inverter outputs only one voltage level but the installation requires both.
The 100A rating refers to the current capacity on the 120V side. Load balancing is an important function of this unit: when loads on the two 120V legs are unequal, the autotransformer actively balances the current drawn from the inverter, preventing one leg from being overloaded. This is particularly relevant in RV and marine installations where 120V and 240V appliances run simultaneously. The passive winding design means there are no fans, no control boards and no firmware to manage, keeping maintenance requirements low.
Technical Specifications
| Parameter | Value |
| SKU | ITR000100101 |
| Voltage | 120/240V AC split-phase |
| Current Rating | 100A |
| Weight | 12.4 kg |
| GTIN | 8719076022428 |
Applications
- North American split-phase off-grid systems using Victron Quattro or MultiPlus inverter/chargers.
- Marine and yacht installations requiring both 120V and 240V AC distribution from a single inverter output.
- RV and motorhome builds where shore power or inverter output must supply mixed 120V/240V loads.
- Remote cabins and off-grid properties wired to North American electrical standards.
- Load balancing between two 120V legs in any split-phase AC distribution board.
What Is Included
- 1 x Victron Energy Autotransformer 120/240V 100A (ITR000100101)
Installation Notes
This autotransformer handles mains-level AC voltages up to 240V at currents up to 100A. Installation must be carried out by a qualified electrician familiar with split-phase AC wiring. Correct neutral and earth bonding is critical to safe operation. Ensure the unit is mounted in a ventilated enclosure and that all cable terminations are rated for the connected load. This product is intended for use in off-grid, marine and vehicle systems and is not designed for connection to the UK public grid. G98 or G99 grid connection requirements do not apply to this product.
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.