[ISOLATED] Japanese Step Down Transformer

From: $75.00 $40.00


[ISOLATED] Japanese Step Down Transformer

(3 customer reviews)

Step down Transformer – Japanese Voltage Converter for Australia.

It changes 240 volts down to 100 volts.
This Step Down is for appliances 100 watts or less.

Protect your Japanese appliance – buy a step down that is guaranteed safe:

  • Our transformers are made to the highest quality standards
  • All voltage converters come with a 1 Year Money Back Warranty
  • Designed to protect your device
  • Unlike others, our voltage converters are designed to run continuously 24/7 - read why important
  • Quality casing & included Safety Fuse protection
  • This new range is lighter & more compact
  • Safety fuse protection (50W and above)
  • Strong carry handle, enclosed and strong metal construction rubber feet (500W and above)
  • Thermal overload in the winding of the transformer
  • Thermally tested to Australian Standard AS/NZS61558

These features ensure your Japanese device runs safely on Australian power.

Note: If you are looking for our economy priced non-isolated (auto) stepdowns see here.

Service is Important.
We Offer Quality Service.

At TorTech, we encourage all of customers to come visit our office in Greenacre, Sydney for assistance in selecting the right voltage converter for you! Our team of specialised engineers are happy to examine your product and assist in helping pair you with our recommended voltage converter out of a wide range of stock.

If we don’t have a voltage converter in-stock that you require, we can manufacture you a custom transformer that will meet your needs! If you are experiencing any difficulties with our transformers with your product, we can help resolve the issue by testing both the transformer and product at TorTech. We aim to ensure you are satisfied with your decision and continue running your appliance without any problems.

Model Comparison

Part NumberWattsOutput AmpsDimensions (l x w x h)WeightOutletsHandle
SD100--5050W0.5A134mm x 92mm x 71mm1.5kg1no
SD100-100100W1.0A168mm x 158mm x 91mm3.5kg1no
SD100-300300W3.0A176mm x 159mm x 105mm4.5kg1no
SD100-500500W5.0A209mm x 162mm x 128mm7kg1yes
SD100-10001000W10.0A230mm x 182mm x 130mm10kg2yes
SD100-15001500W15.0A300mm x 230mm x 180mm16kg2yes
SD100-20002000W20.0A300mm x 230mm x 180mm16kg2yes

To determine which below Step Down transformer you need please check these five questions first:

When decided on which Transformer will be suitable for your appliance/s, it is important to consider the Power Rating of the device/s you wish to run on the Transformer.

To determine the Power Rating of your appliance/s, you must determine the total wattage (W) or total ampere (A). This will be presented on the product in a electrical specification label, or in the product manual.

Once the total wattage (W) or total ampere (A) is determined, please use our ‘Calculator’ located on the tab section of this page. This calculator will help guide you on which Transformer is recommended using your appliance/s details.

Always note that the Transformer must always be 20-25% higher in wattage (W) rating than the total wattage of your appliance/s.

E.g: Playstation 3 uses 380 Watts, so you will need the 500 watt rated Step Down transformer.

If a motor is included in your appliance/s, then you should select a Step Down Transformer rating approx 25% higher than your motor as a buffer.  

Motors have a higher power demand on the Step Down Transformer and draw higher start-up currents which need to be allowed for.

Most motors have a rating plate on them with their power (VA), wattage (W) and/or ampere (A) rating.

If so, how critical is this timing device? Our Transformers convert the voltage (V) and cannot change the frequency (Hz). 

Please note Australia’s power grid supply operates at 50Hz. 

If a timing device is included, the speed of the device may change due to the frequency difference in the power grid. This results in the appliance/s operating at 50Hz (Australia) when designed for 60HZ (Western Japan). An example of which appliance/s may be more affected by this are: old clocks, motors/fans/microwaves.

 Most modern electronic devices should not be affected. Please read further about frequency for more information.

Calculation for Wattage:

Wattage (W) = Ampere (A) x Voltage (V)

An Example is Wattage = 5 Amps x 110 Volts = 550 Watts

Please check the total watts (W or VA) of all devices and ensure this is 20% lower than the power rating (W or VA) of the Step Down Transformer. If using more than two devices, please use a USA Powerboard to run multiples devices. 

Still unsure which Stepdown you will need?  See our Guide to choosing the right stepdown.

As featured on – read the Independent review of our Stepdowns.

You may also contact us with your reply to above questions & we will advise you the transformer required.

Quality toroidal transformer inside
Strong riveted carry handles
Voltage Converter Selector
  • Voltage
  • Amps or Watts?
  • Calculator
  • Results

Additional information


50W, 100W, 300W, 500W, 1010W, 1500W, 2000W

Product Enquiry

3 reviews for [ISOLATED] Japanese Step Down Transformer

  1. Dan (verified owner)

    Great product at an unbeatable price. I used it for my audio equipment and noticed a huge change in my system in a good way.
    Delivery was fast.

    Only one thing that i concern is that the unit doesnt seem to provide earth in the output socket ? Or is it a characteristic of an iso tran ?

    • Alex

      Thank you for your review Dan.
      That is correct that this is a characteristic of an Isolated Transformer.
      The Transformer’s input Earth is not carried through to the output to ensure complete Isolation.

  2. Kim (verified owner)

    Top quality product.
    I brought 2 x large and 2 x small Tortech step-up converters with me to Japan four years ago and they ha e worked every day.
    Now back in Australia I have bought 2 x step-down converters to use here – and again; working perfect.
    Can only recommend their products as high quality and well made !

  3. Yan

    Great compact transformer and works well. I am appreciative that it was explained to me why I needed a Japanese stepdown over a USA stepdown. Even though the voltage is slightly different, running a japanese device from a USA stepdown can apparently eventually over volt and destroy it. This is why i switched to a Japanese stepdown. Great service and time taken to explain this important difference which I am greatful for.

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Item 1 – Cast Resin type Isolation Transformer

HV Winding 1

LV Winding 1

LV Winding 2

Rated power





Rated voltage








Off circuit tapping links


±2.5%, +-5%







Vector group


Insulation level (Maximum BIL/AC)





Winding material

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Aluminium cast windings in quartz filled self-extinguishing epoxy resin

Type of winding

Vacuum Resin Cast

Vacuum Resin cast

Vacuum Resin cast


AS 60076-11, AS 2374



Degree of protection


Type of cooling


Installation altitude

< 1000 a.m.s.l


And fire behaviour class