Victron Autotransformer 120/240VAC-32A ITR000100001

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The Autotransformer 120/240VAC-32A is designed to be used for step-up, step-down, and split-phase output balancing purposes.

It is useful in scenarios where there is a split-phase supply of 30A 120/240V, which can be from the grid, a generator, or two stacked inverters.

The autotransformer can handle load imbalances by creating a new neutral and allows for more efficient utilization of the 30A supply.

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Autotransformer 120/240VAC-32A  

The Autotransformer: for step up, step down and split phase balancing

An autotransformer can be used for step up, step down and split phase output balancing purposes. While the step up and step down functions are fairly straightforward, split phase output balancing may require some more attention.

Consider for example a 30A 120/240V split phase supply.

The supply could be the grid, a generator or two stacked inverters

Some of the loads connected are 240V, others are 120V. On each 120V leg the load should not exceed 30A. The problem is that as soon as 120V loads are connected, the two legs will show a different current. This is because the 120V loads on the two legs will never be balanced. A 120V 1200W hairdryer, for example, will draw 10A from one leg. A 120V washing machine could even draw in excess of 20A from one leg. Between the two legs the difference in current, or current unbalance, will therefore often be 20A or more. This means that the 30A supply will not be used up to its full potential. By the time one leg draws 30A, the other leg may be drawing no more than 10A, and increasing the 240V load, for example, will result in an overload of one leg while the other leg still has spare capacity.

Theoretically, the total power that can be drawn from a 30A 120/240V supply is 30 x 240 = 7,2 kVA. In case of 20A unbalance, the practical maximum will be 30 x 120 + 10 x120 = 4,8kVA, or 67% of the theoretical maximum.

The solution is an Autotransformer

By leaving the neutral of the split phase supply unused, and connecting an Autotransformer to create a new neutral, as shown in figure 1, any load unbalance is ‘absorbed’ by the Autotransformer. In case of a 30A supply, the load can be increased to 7,2kVA, and a 20A load unbalance will result in one leg supplying 40A, and the other leg 20A. The 20A difference will flow through the neutral and the windings of the Autotransformer. The current through both 120V wires of the split phase supply will be 30A.

Important Notice:

Please note that the images of the product shown above are for illustrative purposes only.

While we strive to provide accurate representations, there might be slight differences between the product image and the actual product you receive. These variations could be due to lighting, individual screen settings, product enhancements, or minor design updates from the manufacturer.

We assure you that any discrepancies are minimal and will not affect the overall quality and functionality of the product.

If you have any questions or concerns, please feel free to contact our customer support team for further assistance at support@batsol.co.uk or phone us at 01752 656270.

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Key Features
  • Can be used for step-up, step-down, and split-phase output balancing
  • Handles load imbalances by creating a new neutral
  • Improves the efficiency of utilization of a 30A 120/240V supply
  • Protected against overheating and reverse polarity connection
  • Features a toroidal transformer type
Specifications
Brand

Victron Energy

Manufacturer Part Number

ITR000100001

GTIN

8719076022404

Input Circuit Breaker

32A, two pole

Maximum 240V Feed Through Current

32A

Transformer Type

Toroidal

Protection Category

IP21

Dimensions

H425 x W214 x D110mm

Weight

12.5Kg

Warranty

5 Years

Country of Manufacture

India

 

Attachments

Data Sheet

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