[ISOLATED] American Step Down Transformer

From: $47.00 $40.00


[ISOLATED] American Step Down Transformer

(14 customer reviews)

Step down Transformer – American Voltage Converter for Australia Order Above

A step down transformer is the ideal solution if you have an appliance designed to run on America’s 110/120 volt system but is needed to run here on Australia’s 240 volt power.

This transformer converts 240 volts down to 110/120 volts to allow your USA device to run in Australia.

Simply plug transformer into the Aussie power socket & the device into the US power outlet & your ready to go!  

Protect your USA 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 (250W and above)
  • Thermal overload in the winding of the transformer
  • Thermally tested to Australian Standard AS/NZS61558

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

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

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

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

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
SD110--5050W0.45A130mm x 90mm x 70mm1kg1no
SD110-100100W0.91A168mm x 158mm x 91mm3.5kg1no
SD110-250250W2.27A176mm x 159mm x 105mm4.5kg1yes
SD110-500500W4.50A209mm x 162mm x 128mm7kg1yes
SD110-10001000W9.10A230mm x 182mm x 130mm10kg2yes
SD110-15001500W13.60A300mm x 230mm x 160mm13kg2yes
SD110-20002000W18.20A300mm x 230mm x 160mm16kg2yes
SD110-24002400W21.80A300mm x 230mm x 160mm16kg2yes

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. 

Frequently asked Questions about the frequency difference, 110v, & more read here 

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

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, 250W, 500W, 1010W, 1500W, 2000W, 2400W, 3000W, 3500W, 3500W w/ Hardwired NEMA Lead, 4000W

Product Enquiry

14 reviews for [ISOLATED] American Step Down Transformer

  1. Walter (verified owner)

    Once ordered, the step down transformer was delivered really quickly only taking less than 2 days from order to receiving the item in Canberra. However, the item sent was the step down for Japan, and not North American. A quick telephone call and Tortech issued the postal return paperwork, and almost simultaneously sent the correct American step down, even before they received my returned step down for Japan.

    While there was a small error in the process, the customer service in response to the error was great. Many thanks for your good, prompt customer service.

  2. Chris Broome

    Isolated American Step Down Transformer combined with an Onkyo TX-RZ830 9.2 Channel 4K Network A/V Receiver.

    I was advised that due to my 850 watt 110 volt 60 HZ ‘s Network A/V Receiver drawing more than 1000 watts than thought I got the 2000 Watt version.

    I have been looking online for a while and buying an Onkyo TX-RZ830 9.2 Channel 4K Network A/V Receiver would cost me at least $2000-3000 Australian, so I took the risk and imported one from the USA. What a risk it was, but glad I did because I saved myself at least $1000. I actually got a brand new Onkyo TX-RZ830 9.2 Channel 4K Network A/V Receiver for $1000 Australian including delivery and import Tax.

    Now all I needed was the Isolated step-down transformer and Tortech were happy to build one for me in 2 days and ship to me within 2 days. I grabbed the special $250 price that was reduced from $640!!

    Happy days 🙂

  3. James

    Got a large Isolated stepdown 3500W unit to run my boat from shore power. Amen it works very well ! I previously had a another stepdown and I couldnt handle handle the load at all and konked out after 20 mins – this one can. I rely upon this one as it has to provide power to all appliances on the boat every time I move to shore power. This unit is built to last, to be honest its not light but well it’s made, strong handle. I eventually got a sparky to hardwire it in with a nema cable and store the whole transformer in the cabin with ventilation. Also being that it is isolated it gives me peace of mind that it is running safely in the cabin, as it runs all night and for days at a time when we are onshore. Thankyou for your help and assistance as well.

  4. Chad H

    Have purchased your isolated stepdowns for our lighting and christmas light installations over the last decade. I can vouch that these are built to last and are safe, we have units still working we got from you over 10 years ago!. Have recommend tortech stepdowns to others as well. I do like that they include additional fuses, these may come in handy over the years ,so hold onto them.

  5. David

    Works well, robust and well made. Delivery was quick and I am happy with the safety factor with the isolated model.

  6. John

    Bought the 500w step down the use with my dewalt drill. Works like a charm. Reliable and the transformer is clearly well made.

  7. Steven Lim (verified owner)

    I needed a stepdown transformer to run an audio amp and controller from the US to run music through the house. Got some great advice from the team at Tortech who advised the toroidal transformer. I’ve gone a little bigger than needed just in case (2000w). Arrived promptly, within a week. All up and running and everything is great. No hum and audio system sounds great. Thanks

  8. Brock (verified owner)

    Excellent company and product I purchased a 1010 watt US stepdown for my Panasonic mini hifi which I purchased from the US and the stepdown works perfectly. They did recommend a 500watt but I decided to pay a bit extra and jump to 1010 for that bit extra. the stepdown stays cool and works perfect for my stereo, thank you Tortech for an excellent buying experience and designing such a safe and efficient product for US appliances. I’m more than happy and very great full to your company and team. 😄👍

  9. James

    Got your stepdown to run our professional Kitchenaid mixer, which even combined with the AUD to USD rate i am still ahead at present! We needed to run the mixer for long periods as used commercially, so after doing my reading and hearing that most other transformers can only work for 30 mins at a time I sided with yours, additionally the safety factor was a concern and isolation is ideal. Anyway long story the mixer is working exceptionally well, weve had it going at times all day for food prep and even at high load there has been no issue.

  10. Kent Bayley

    I collect vintage radios which are mostly getting on for 90 years old now. They often need a 110 volt transformer to run so I didn’t want an auto transformer for safety reason or indeed one with poor regulation which I could have bought for $40 on ebay. Don’t bother and dont trust them as they are mostly rubbish. If you care about your appliance/equipment as I do the then call Tortech and buy quality and safety.

  11. K Dallimore (verified owner)

    Really good – better than expected

  12. Richard

    Having USA boat to be converted entirely over to Aussie power was not an option. After reading a review posted here I purchased the isolated 3500w model. I can also vouch that the transformer is durable, robust, well ventilated and safe! Safety is top on my priority as the transformer is running continuously at times providing power to fridge and shower heating while running from the marina. The isolated transformer is working perfectly after 6 months so thanks to Tortech, works as promised!

  13. Charles

    I have used this model in the PNG embassy. Good transformers and meet standards for the consulates requirements. We have had no reported issues and transformers have lasted for over 10 years of use so far.

  14. Erin Lynch

    Couldn’t ask for a better experience, service or product from a company. Didn’t have a clue which transformer was needed. I purchased a Brother embroidery machine for my mum in the states, the TorTech staff member I spoke with got all the details of the machine from me & then advised which was best. The step down transformer was then delivered within a couple of days. The transformer works perfectly & my mum is very happy. I highly recommend TorTech to anyone looking for a transformer.

Add a review

Your email address will not be published. Required fields are marked *

Close Menu


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