PHC Enterprise ISO-1000 professional 1000VA isolation transformer, 117VAC to 117VAC enclosure

PHC Enterprise ISO-1000 1000VA isolation transformer rear view with 117VAC input and output connections

PHC Enterprise ISO-1000 professional 1000VA isolation transformer, 117VAC to 117VAC, one outlet

Professional 1000VA Isolation Transformer (117VAC to 117VAC) | ISO-1000

Name: Professional 1000VA Isolation Transformer (117VAC to 117VAC) | ISO-1000
Rating: 4.78 (51 reviews)

by PHC Enterprise, Inc.

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$199.99

$199.99 - $199.99

$199.99

$179.00

$179.00 - $179.00

$179.00

Product Overview: The ISO-1000 is a heavy-duty 1000VA professional isolation transformer engineered by PHC Enterprise, Inc. to provide true galvanic isolation between AC mains and equipment under test. By eliminating direct mains continuity, it establishes a floating output designed to reduce benchtop noise and protect sensitive electronics during high-draw laboratory troubleshooting and vintage audio restoration.

Technical Specifications

Part: ISO-1000
Input Voltage: 117V AC (60Hz)
Output Voltage: 117V AC (Physically Isolated, Load-Dependent)
Power Capacity: 1000VA (Nominal continuous rating; approximately 8.55A at full load)
Overcurrent Protection: 10 Amp Fast-Blow Fuse (GMA-10A-5)
Outlets & Connections: Grounded 3-prong input plug to polarized 3-slot output receptacle
Topology: True Galvanic Isolation (Unbonded floating secondary)
Dimensions: 9.5” (L) x 6.8” (W) x 6.0” (H)
Weight: 18.3 lbs

Industrial & Laboratory Applications

Vintage Audio & "Hot Chassis" Repair: Essential bench utility for isolating legacy tube amplifiers, non-polarized electronics, and large-scale radio restoration gear.
Benchtop Testing & QC: Isolates devices under test from line-ground references to facilitate safe, structured diagnostic probing.
Engineering R&D: A robust, isolated AC source for validating prototype power footprints and heavy-duty component behavior.
Educational & Physics Labs: Provides isolated power distribution layout required for university-grade electronics benches.

Key Features

True Galvanic Isolation: Complete physical magnetic separation from AC utility mains via industrial-grade copper windings and a reinforced steel enclosure.
Floating Output Design: Features an unbonded internal ground configuration to isolate secondary circuits from earth-ground loops.
Heavy-Duty Construction: Built for continuous commercial benchtop operation with rugged thermal management and durable housing.

Safety Note: This unit is built strictly for professional laboratory, engineering, and repair environments. By design, the secondary output is floating and does not provide an automatic earth-ground reference path. Technicians must be thoroughly trained in isolated power safety protocols and proper grounding rules for test instruments.

Frequently Asked Questions

Q: What is the continuous current rating of the ISO-1000?
A: The unit is rated for 1000VA, which translates to roughly 8.55A at 117VAC. It utilizes a 10A fast-blow safety fuse (GMA-10A-5) for circuit protection.

Q: Does this unit have a bonded earth ground on the output?
A: No. The ISO-1000 provides a true floating secondary output with no internal input-to-output ground bond, preventing ground-loop feedback during bench diagnostics.

5 stars: 46 (90%)
4 stars: 2 (4%)
3 stars: 1 (2%)
2 stars: 1 (2%)
1 star: 1 (2%)

Some of the reviews shown are from related products the merchant grouped with this one.

Nicely built, solid BUT...

They put normal fuses in it and the directions specify slo-blo, so in the process of checking it out, I blew a fuse. I just purchased the specified ones from Amazon, and no more problems. I'd buy it again, but come on....put the correct fuses in it.!

Works. Looks good too.

More compact with the toroid transformer.

Professional 1000VA Isolation Transformer | 117VAC to 117VAC - ISO-1000

Work as described.

Excellent Packing

Unit works exactly as it should. This unit is heavy, it was double boxed along with bubble wrap and fitted inserts. Outstanding!

Isolated ok

PHC 500VA Isolation Transformer, 117VAC

A true isolation transformer. Simplistic and effective. Outstanding.

500 VA Isolation Transformer

Item packaged well, shipping was fine, working as expected. Happy with purchase.

1000VA Isolation Transformer

Fast delivery, exceptional packaging, and sturdy construction. Have used it a few times and it performs as it should. I will purchase additional items as the need arises.

Looks good

And, it' heavy, but I havent used it yet.

Packed and shipped well.

Very well built. Works perfectly. Good value.

Superlative

I ordered a 20 some pound transformer and was thinking I would be lucky if it arrived unscathed. It was in perfect condition mainly due to the outstanding way it was packed. Triple boxed with foam between each layer. It was truly gorilla proof. And the product inside is well made and reasonable price. What a contrast to the business as usual companies that I normally deal with. Thank you.

Thank you for your business and for taking the time to leave such a wonderful review! We are thrilled to hear that your 1000VA Isolation Transformer arrived in perfect condition and that you were impressed with the packaging. We take great care in ensuring that our products are well-protected during shipping. We are also glad to know that you found our product to be well-made and reasonably priced. Thank you for choosing our company and we hope to serve you again in the future.

Happy Holidays!

A genuinely amazing buying experience with AC DC Powershack. The isolation transformer was packed with meticulous care—thank you! Owner Patrick is fantastic and made communication effortless. Top marks all around.

We appreciate your support and kind words. Happy Holidays!

Works great

Great to hear it is working for your application. Appreciate the business and review. Have a great day!

excellent quality

This is the perfect addition to my shop for doing vintage radio troubleshooting. The isolation transformer works fine and appears to be well made.

Thank you for taking the time to leave a review for our 500VA Isolation Transformer. We are delighted to hear that it is the perfect addition to your shop for vintage radio troubleshooting and that it is working well for you. Our team takes pride in providing excellent quality products and we are glad to know that it appears to be well made.

Have a great day!

Works great

Now a staple component to my electronic desk.

Thank you so much for your business and for taking the time to leave a review. We are thrilled to hear that our 300VA Isolation Transformer is now a staple component on your electronic desk. It's always a pleasure to know that our products are meeting the needs of our customers. Thank you again for your support!

Best,
Hans

Very nice

This is a real isolation transformer. Keeps me safe when doing my repairs.

Thank you for taking the time to leave a review for our 500VA Isolation Transformer. We are happy to hear that it has been working well for you and providing the safety you need during repairs. We appreciate your support and hope to continue providing you with quality products in the future.

Well designed product

I got the 500VA small Isolation Transformer for doing refurbishing of old short wave radios. The unit is attractive, compact, very well designed and has a reasonable price. I am completely happy with my purchase.

300VA Isolation Transformer, 117VAC to 117VAC

Thank you for your review of our 300VA Isolation Transformer. We are glad to hear that you are satisfied with your purchase and that it meets your needs. If you have any further questions or concerns, please don't hesitate to reach out to us. Thank you for choosing our product.

300VA Isolation Transformer, 117VAC to 117VAC

Hi there! Thank you for your business and for taking the time to leave a review for our 300VA Isolation Transformer. We're glad to hear that it met your needs and we hope it continues to serve you well. Have a great day!

300VA Isolation Transformer, 117VAC to 117VAC

Thanks for the 300VA Isolation Transformer, 117VAC to 117VAC. The shipping was fast look great and is heavy. transformer was a great price would buy from AC-DC PowerShack again.

Thank you for your kind review! We are thrilled to hear that you are happy with your 300VA Isolation Transformer. Our team always strives to provide fast shipping and quality products at affordable prices. We are always happy to hear when our customers are 100% satisfied. Thank you for choosing AC-DC PowerShack, we appreciate your business.

Fast, efficient, and excellent price.
Thanks

Hello Roberto,

Thank you for your purchase and taking the time to leave a review. Have a great day!

Very loud hum

Unfortunately, this transformer hums louder than the hum I'm trying to eliminate from my amplifier. It actually made me a little nervous to use so I'm getting rid of it. It was on sale though, so that was a plus.

Thanks for taking the time to leave a honest review. Please look out for our email to see if we can resolve this issue. The isolation transformer usually would not have a hum unless it is defective or it is running near or at the rated wattage.

A Workbench Essential

I use this to isolate my Powerstat and Dimbulb on my workbench when testing electronic gear. 300 VA is all I need because of the Dimbulb limiter and it works as advertised.

Thank you for your review! We're thrilled to hear that our 300VA Isolation Transformer has become an essential tool on your workbench. We're glad it's working as advertised and meeting your needs.

Better than expected

For the price point, this is a great deal! The order was well packaged and not damaged at all, unlike some other vendors that I have bought from. The transformer was not advertized as a toroid, but it is which is a big plus. It is properly mounted to the case with a good bolt, and isn't going anywhere. The case itself is decently thick sheet metal. Solder connections on the inside were good, wiring was tidy, and nothing needed rework. Input side had a two-pole switch and a glass fuse. Output has a switched breaker. All in all, this is a really nice and well built unit and you can't beat the price.

Thank you for taking the time to leave such a positive review of our 1000VA Isolation Transformer. We are delighted to hear that it exceeded your expectations in terms of quality and packaging. We take pride in providing well-built products at a great price. Our team works hard to ensure that every detail, from the toroid design to the sturdy case and clean wiring, meets our high standards. We appreciate your business and hope to continue exceeding your expectations in the future.

Isolation transformer

Needed for bench work on some older type tube receivers. Fit my needs also the two outlets provided a plus. Received quickly and well packed. Completive pricing
and reasonable shipping would use again.

Thank you for choosing our product and for sharing how you utilize the isolation transformer with the community. We hope to have the opportunity to serve you again in the future!

Assume it isolates, but dd not cure my noise problem

There are no guarantees that a transformer will cure any noise issue, and this did not. Also, because it hums, it is introducing noise into the room. I did not expect this. I am debating on whether to return it, redeploy to another area, or to upgrade to a balanced power solution, etc. It has serious heft, so I am sure its a good isolation transformer. I feel like it may have opened up/uncompressed the low end quite a bit, but can not measure this accurately.

Thank you for sharing your experience with our 1000VA Isolation Transformer. We apologize that it did not fully resolve your noise issue. While we cannot guarantee that our transformer will solve all noise problems, we do stand by its quality and effectiveness as an isolation transformer.

Regarding the hum, I will reach out to you to see if we can remedy the problem or provide a solution to your satisfaction.

We appreciate your feedback and are always looking for ways to improve our products.

Great product

It did a good job as advertised. I was getting a hum when I turned on my subwoofer. I plugged the sub directly to the isolation transformer. It decreased it by about 90%. Maybe if I plug my sub into my power conditioner and then plug the power conditioner into the transformer it might eliminate the hum completely. I have not tried it yet. Have not had time,but the hum is barely noticeable now. I have to get very close to the sub to detect it. Very happy even with the 90% hum reduction
I'll will definitately keep it
Great product..

Thank you for taking the time to leave a review for our 500VA Isolation Transformer. We are so glad to hear that it has been working as advertised and has greatly reduced the hum from your subwoofer.

If you have any further questions or concerns, please don't hesitate to reach out to us. We truly appreciate your support and hope you continue to enjoy our product.

5 stars: 46 (90%)
4 stars: 2 (4%)
3 stars: 1 (2%)
2 stars: 1 (2%)
1 star: 1 (2%)

Some of the reviews shown are from related products the merchant grouped with this one.

Nicely built, solid BUT...

Works. Looks good too.

More compact with the toroid transformer.

Professional 1000VA Isolation Transformer | 117VAC to 117VAC - ISO-1000

Work as described.

Excellent Packing

Unit works exactly as it should. This unit is heavy, it was double boxed along with bubble wrap and fitted inserts. Outstanding!

Isolated ok

PHC 500VA Isolation Transformer, 117VAC

A true isolation transformer. Simplistic and effective. Outstanding.

500 VA Isolation Transformer

Item packaged well, shipping was fine, working as expected. Happy with purchase.

1000VA Isolation Transformer

Fast delivery, exceptional packaging, and sturdy construction. Have used it a few times and it performs as it should. I will purchase additional items as the need arises.

Looks good

And, it' heavy, but I havent used it yet.

Packed and shipped well.

Very well built. Works perfectly. Good value.

Superlative

Happy Holidays!

We appreciate your support and kind words. Happy Holidays!

Works great

Great to hear it is working for your application. Appreciate the business and review. Have a great day!

excellent quality

This is the perfect addition to my shop for doing vintage radio troubleshooting. The isolation transformer works fine and appears to be well made.

Have a great day!

Works great

Now a staple component to my electronic desk.

Best,
Hans

Very nice

This is a real isolation transformer. Keeps me safe when doing my repairs.

Well designed product

300VA Isolation Transformer, 117VAC to 117VAC

300VA Isolation Transformer, 117VAC to 117VAC

Thanks for the 300VA Isolation Transformer, 117VAC to 117VAC. The shipping was fast look great and is heavy. transformer was a great price would buy from AC-DC PowerShack again.

Fast, efficient, and excellent price.
Thanks

Hello Roberto,

Thank you for your purchase and taking the time to leave a review. Have a great day!

Very loud hum

A Workbench Essential

I use this to isolate my Powerstat and Dimbulb on my workbench when testing electronic gear. 300 VA is all I need because of the Dimbulb limiter and it works as advertised.

Thank you for your review! We're thrilled to hear that our 300VA Isolation Transformer has become an essential tool on your workbench. We're glad it's working as advertised and meeting your needs.

Better than expected

Isolation transformer

Thank you for choosing our product and for sharing how you utilize the isolation transformer with the community. We hope to have the opportunity to serve you again in the future!

Assume it isolates, but dd not cure my noise problem

Regarding the hum, I will reach out to you to see if we can remedy the problem or provide a solution to your satisfaction.

We appreciate your feedback and are always looking for ways to improve our products.

Great product

Thank you for taking the time to leave a review for our 500VA Isolation Transformer. We are so glad to hear that it has been working as advertised and has greatly reduced the hum from your subwoofer.

If you have any further questions or concerns, please don't hesitate to reach out to us. We truly appreciate your support and hope you continue to enjoy our product.

5 stars: 46 (90%)
4 stars: 2 (4%)
3 stars: 1 (2%)
2 stars: 1 (2%)
1 star: 1 (2%)

Some of the reviews shown are from related products the merchant grouped with this one.

Nicely built, solid BUT...

Works. Looks good too.

More compact with the toroid transformer.

Professional 1000VA Isolation Transformer | 117VAC to 117VAC - ISO-1000

Work as described.

Excellent Packing

Unit works exactly as it should. This unit is heavy, it was double boxed along with bubble wrap and fitted inserts. Outstanding!

Isolated ok

PHC 500VA Isolation Transformer, 117VAC

A true isolation transformer. Simplistic and effective. Outstanding.

500 VA Isolation Transformer

Item packaged well, shipping was fine, working as expected. Happy with purchase.

1000VA Isolation Transformer

Fast delivery, exceptional packaging, and sturdy construction. Have used it a few times and it performs as it should. I will purchase additional items as the need arises.

Looks good

And, it' heavy, but I havent used it yet.

Packed and shipped well.

Very well built. Works perfectly. Good value.

Superlative

Happy Holidays!

We appreciate your support and kind words. Happy Holidays!

Works great

Great to hear it is working for your application. Appreciate the business and review. Have a great day!

excellent quality

This is the perfect addition to my shop for doing vintage radio troubleshooting. The isolation transformer works fine and appears to be well made.

Have a great day!

Works great

Now a staple component to my electronic desk.

Best,
Hans

Very nice

This is a real isolation transformer. Keeps me safe when doing my repairs.

Well designed product

300VA Isolation Transformer, 117VAC to 117VAC

300VA Isolation Transformer, 117VAC to 117VAC

Thanks for the 300VA Isolation Transformer, 117VAC to 117VAC. The shipping was fast look great and is heavy. transformer was a great price would buy from AC-DC PowerShack again.

Fast, efficient, and excellent price.
Thanks

Hello Roberto,

Thank you for your purchase and taking the time to leave a review. Have a great day!

Very loud hum

A Workbench Essential

I use this to isolate my Powerstat and Dimbulb on my workbench when testing electronic gear. 300 VA is all I need because of the Dimbulb limiter and it works as advertised.

Thank you for your review! We're thrilled to hear that our 300VA Isolation Transformer has become an essential tool on your workbench. We're glad it's working as advertised and meeting your needs.

Better than expected

Isolation transformer

Thank you for choosing our product and for sharing how you utilize the isolation transformer with the community. We hope to have the opportunity to serve you again in the future!

Assume it isolates, but dd not cure my noise problem

Regarding the hum, I will reach out to you to see if we can remedy the problem or provide a solution to your satisfaction.

We appreciate your feedback and are always looking for ways to improve our products.

Great product

Thank you for taking the time to leave a review for our 500VA Isolation Transformer. We are so glad to hear that it has been working as advertised and has greatly reduced the hum from your subwoofer.

If you have any further questions or concerns, please don't hesitate to reach out to us. We truly appreciate your support and hope you continue to enjoy our product.