The 9 Best Isolation Transformers

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This wiki has been updated 17 times since it was first published in August of 2019. Whether you're looking to protect sensitive medical or musical equipment in a hospital or recording studio, or you're a hobbyist trying to create the safest, most effective electronics workbench, one of these isolation transformers should do the trick. We've included a wide variety of models, some of which also boast features like battery backup and surge suppression. When users buy our independently chosen editorial picks, we may earn commissions to help fund the Wiki.

1. Trip Lite IS1800HG

2. PHC Enterprise 1000 Watts AC

3. Tripp Lite Omni 1000

Editor's Notes

February 08, 2021:

It was a fairly straightforward round of updates – as we determined that our existing rankings, in their entirety, were still worth our users’ consideration – but we did find manage to dig up a couple additional options that we thought were worth including.

Our first new pick, the Jameco Valuepro GRP-1200, is a basic model that we selected based primarily on its budget-friendly price. In addition to offering two isolated outlets for your protected equipment, it also has a pair of standard, 120-volt outlets that you can use for less-sensitive gear, as long as you’re ok with hooking up to the same circuit as your protected loads.

Our second new addition, the Umi AV250, caught our eye with its contemporary aesthetic, which will likely make it a shoo-in for users who’re sensitive about the styling in their recording studio. Just note that, despite its two-outlet configuration, this model’s maximum power rating tops out at 250 watts, which significantly limits the equipment you can connect to it.

September 06, 2019:

When seeking out an isolation transformer, its intended use is paramount. Hobbyists are going to have much simpler needs than experts in medical fields or engineers in a recording studio. Interestingly, the vast majority of isolation transformers currently on the market don't offer true circuit isolation, in that so many have three-prong outlets whose grounds — if you trace the circuit back to the building's breaker or the telephone pole outside — actually connect to the neutral line. This can create a potentially hazardous situation for the unsuspecting hobbyist, as he or she could easily hook up a grounding clip to an otherwise safe component and either experience the unpleasant effects of an electrical shock or cause significant damage to their equipment.

One of the reasons that there are so many Tripp Lite models on our list is that they're relatively easy to tinker with, so savvy customers can actually remove this grounding with relative ease to create true isolation for their workbenches. A simple shortcut to this would be to employ a three-to-two prong adapter, which is included with one or two of the offerings listed. Of course, this kind of thing is only really necessary if you're after that highest degree of isolation. Most users are happy with the noise and surge suppression that many of these models offer, whether it's for use in medical fields, musical spaces, or something else. And we took that general use into account when selecting things like the Tripp Lite model at number three, which offers an admittedly short period of battery backup, but that gives you enough to make sure you can save valuable projects and even back them up onto external hard drives before the power goes completely out or a generator can kick on.

4. Tripp Lite IS1000HG

5. PHC ISO-500 AC

6. Umi AV250

7. Jameco Valuepro GRP-1200

8. Tripp Lite IS500HG

9. Tripp Lite IS250

Will Rhoda
Last updated by Will Rhoda

After deciding that the pen was mightier than the pliers, Canadian electrical contractor William Rhoda abandoned his career and headed back to college, where he majored in marketing and advertising and won a scholarship along the way to earning a diploma in creative communications. His past career landed him a depth of knowledge in tools and hardware, while his current career schooled him in audio, video and camera equipment. During his leisure time, he’s learned lots about outdoor gear, and years of tiresome backyard maintenance have taught him all about pools and hot tubs. His recreational pursuits include rest, relaxation and revolutionary action, and his roommate’s a hairless cat.

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