Repair or source a UPS transformer?

Question

APC Smart-UPS

APC Smart-UPS is a line of uninterruptible power supply (UPS) systems produced by American Power Conversion (APC).

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Jeremy Virgo @jeremyvirgo

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crwdns2955602:0crwdne2955602:0: N'w 9, 2025

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Repair or source a UPS transformer?

I have a SUA1500RMI2U, with a cooked transformer.

Replacement is difficult as the exact model of the transformer seems hard to find, due to age. Replacements I do find also seem fairly expensive.

I’ve heard of transformers with inline fuses, and I’m hoping I can repair this one.

Does anyone have any recommendations on where to start checking if there’s an easy fix or better yet, if there’s a drop in equivalent replacement?

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Is there any manufacturer information on the transformer itself? I'm wondering, if we could find the specs for it, about locating an equivalent.

crwdns2957956:0N'w 9, 2025crwdnd2957956:0 Jerry Wheeler crwdne2957956:0

I’ll crack open the box tonight and get the details.

crwdns2957956:0N'w 10, 2025crwdnd2957956:0 Jeremy Virgo crwdne2957956:0

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Is there any manufacturer information on the transformer itself? I'm wondering, if we could find the specs for it, about locating an equivalent. — Jerry Wheeler

score 1 · Answer 1 · 2025-12-09T19:06:03-07:00

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DanJ @danj

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crwdns2955602:0crwdne2955602:0: N'w 9, 2025

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Have you tried contacting APC to get the schematics and board view drawings to help figure things out.

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Not yet, as I’m expecting the response to be “no, that’s not been sold for x years. Please buy a new $2k unit.”

crwdns2957956:0N'w 10, 2025crwdnd2957956:0 Jeremy Virgo crwdne2957956:0

@jeremyvirgo - Don’t be to fatalistic, you might be surprised.

crwdns2957956:0N'w 11, 2025crwdnd2957956:0 DanJ crwdne2957956:0

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score 1 · Answer 2 · 2025-12-13T21:08:49-07:00

oldturkey03 @oldturkey03

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crwdns2955602:0crwdne2955602:0: N'w 13, 2025

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@jeremyvirgo if you have not "cracked" it open yet, how do you know it's your transformer :-) Anyhow, here is the schematic for your APC Smart UPS 1500va Usb SUA1500RMI2U. If it is indeed the transformer then it is most likely the 430-0029 which is a 120/240V-24/48V Class 130(B) transformer

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APC Smart-UPS

Repair or source a UPS transformer?

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