Padmount Supply

Pad mounted transformers, without the year long wait

Three phase liquid-filled units from 45 to 2500 kVA, dead front, loop feed, built to ANSI/IEEE C57.12.34. We quote from US stock and from overseas production, and we tell you plainly which one your date actually needs.

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172UL listed makers tracked32of them TAA eligible45 to 2500kVA quoted
Typical US factory lead time
50 to 60
weeks from purchase order, and a purchase order buys a production slot rather than a unit

Stock changes that number to days. Which route is right depends entirely on your date, and that is the first thing we work out.

We quote across the manufacturers your specification is likely to name

Four things worth knowing before you order

Most transformer quotes go wrong in the same handful of places. These are them.

The rating is the easy part

Dimensions, weight, impedance and secondary amperage for all twelve standard ratings, so the pad and the crane are right the first time.

See every rating

Who stocks, who builds

A stocking distributor ships in days at a higher price. A factory sells you a slot in a queue. That single distinction decides your date.

Compare manufacturers

Taps, fronts and feeds

Dead front or live front, loop or radial, full capacity taps or not. Get one wrong and it is a new unit and a new lead time.

Read the specifications

Freight is not a rounding error

A 300 kVA unit runs about 3,500 lb and often needs a crane at the far end. We quote freight as its own line rather than burying it.

Get it quoted

Start with the rating

The twelve standard three phase ratings under ANSI/IEEE C57.12.34. Figures are typical at 65 C rise and vary between manufacturers.

75 kVA
52 x 50 x 55 in, about 1,750 lb, 90 A at 480 V
150 kVA
58 x 54 x 60 in, about 2,400 lb, 180 A at 480 V
300 kVA
66 x 60 x 66 in, about 3,500 lb, 361 A at 480 V
500 kVA
72 x 66 x 72 in, about 4,900 lb, 601 A at 480 V
1000 kVA
86 x 76 x 82 in, about 8,200 lb, 1,203 A at 480 V
2500 kVA
112 x 96 x 102 in, about 17,500 lb, 3,007 A at 480 V

All twelve ratings with full dimensions

The lead time is the whole problem

US electricity demand was flat for a decade so nobody built capacity. Now everybody needs one at once, and the queue is the product.

Maddox
Holds stock, ships in days or weeks
Sunbelt Solomon
Holds stock, ships in days or weeks
T&R Electric
Holds stock, ships in days or weeks
Solomon Corporation
Holds stock, ships in days or weeks

Tell us your date

Written for the person specifying the job

Eight plain guides to the details that decide whether two quotes are actually comparable, and whether the unit passes inspection once it is on the pad.

No sales language, no gated downloads. If a quote you already have looks wrong, send it over and we will tell you what it does and does not include, whether or not you buy from us.

Read the specifications

Most read

The supply picture, in numbers

We catalogued every company holding a UL listing to build these for the US market. Nobody else publishes this, and it is free to cite.

UL listed makers
172
TAA eligible
32
Countries
24
Built in China
41%

Only 32 of the 172 companies UL listed to build liquid-filled pad-mounted transformers for the US market are TAA eligible, about 19 percent.

Padmount Supply, 24 September 2026. Free to cite with a link.

All the figures and how they were gathered

Buying one

The routes, what each costs in time, and the questions that decide which is right.

Pad mounted transformers for sale
Stock, factory and overseas compared on lead time
What these cost
Why small ratings cost more per kVA
Used and remanufactured
The five test reports to demand
Rental
And when buying from stock beats it

Terms that get confused

Eight pairs that are used interchangeably and should not be, each with a straight answer.

Power transformer or Distribution transformer
Step up or Step down
Single phase or Three phase
Pad mounted or Pole mounted
Substation transformer or Pad mounted transformer
Switchyard or Substation

All comparisons

Send us the spec

Rating, voltages and the date. You get a price from US stock and a price from overseas production side by side, the country of manufacture stated, and freight on its own line.

Get a quote or call 786 220 2801