Company lists · Data refreshed September 2026

Top 25 Pad-mounted transformer manufacturers based in the United States

RevenueBase identified 258 pad-mounted transformer manufacturers headquartered in the United States as of September 2026 and tracks 22,402 professional contacts across them, including 8,091 with verified work emails. Houston is the largest hub.

This list covers pad-mounted transformer manufacturers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review
258Companies
22,402Contacts tracked
8,091Verified emails
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The 25 largest pad-mounted transformer manufacturers based in the United States

Ranked by team size
Top 25 of 258 pad-mounted transformer manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to pad-mounted transformer manufacturers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidencePullman, WA, United StatesHQ checked Sep 30, 20265,001-10,0006,489 contacts →

Partial evidence

“SEL is a globally recognized designer and manufacturer of products and solutions that make electric power safer, more reliable, and more economical.”

Source: RevenueBase Database · checked Sep 30, 2026
2Indirect evidenceHouston, TX, United StatesHQ checked Sep 30, 20261,001-5,0002,561 contacts →

Indirect evidence

“Powell is hiring- Powell is dedicated to improving people’s lives by providing reliable power distribution systems in every market we serve.”

Source: RevenueBase Database · checked Sep 30, 2026
3Partial evidenceColumbia, SC, United StatesHQ checked Sep 30, 20261,001-5,0001,079 contacts →

Partial evidence

“Hubbell Power Systems (HPS) designs and manufactures a wide variety of electric power transmission, distribution, substation, underground, OEM, and communications products used by…”

Source: RevenueBase Database · checked Sep 30, 2026
4Partial evidenceFremont, CA, United StatesHQ checked Sep 30, 20261,001-5,000969 contacts →

Partial evidence

“Industrial Electric Mfg.(IEM) is the largest independent full-line manufacturer of electrical distribution equipment and integrated power systems in the U.S.”

Source: RevenueBase Database · checked Sep 30, 2026
5Indirect evidenceWarrendale, PA, United StatesHQ checked Sep 30, 20261,001-5,000967 contacts →

Indirect evidence

“Mitsubishi Electric Power Products, Inc.(MEPPI) is a leading U.S.”

Source: RevenueBase Database · checked Sep 30, 2026
6Strong evidenceEllisville, MS, United StatesHQ checked Sep 30, 20261,001-5,000941 contacts →

Strong evidence

“Howard Industries is the leading manufacturer of liquid-filled distribution transformers for the utility and commercial/industrial markets.”

Source: RevenueBase Database · checked Sep 30, 2026
7Strong evidenceRoanoke, VA, United StatesHQ checked Sep 30, 20265,001-10,000792 contacts →

Strong evidence

“Virginia Transformer is an engineering company that manufactures transformers.”

Source: RevenueBase Database · checked Sep 30, 2026
8Indirect evidenceDyersburg, TN, United StatesHQ checked Sep 30, 20261,001-5,000520 contacts →

Indirect evidence

“ERMCO (Electric Research and Manufacturing Cooperative, Inc.) is headquartered in Dyersburg, Tennessee.”

Source: RevenueBase Database · checked Sep 30, 2026
9Indirect evidenceHouston, TX, United StatesHQ checked Sep 30, 20261,001-5,000511 contacts →

Indirect evidence

“RESA Power is your ONE-STOP for all of your power needs.”

Source: RevenueBase Database · checked Sep 30, 2026
10Partial evidenceGreer, SC, United StatesHQ checked Sep 30, 2026201-500286 contacts →

Partial evidence

“Maddox serves the commercial, industrial, utility, and renewables segments of the transformer market.”

Source: RevenueBase Database · checked Sep 30, 2026
11Indirect evidenceKansas City, MO, United StatesHQ checked Sep 30, 2026501-1,000266 contacts →

Indirect evidence

“Milbank provides the tools that empower life.”

Source: RevenueBase Database · checked Sep 30, 2026
12Indirect evidenceFontana, CA, United StatesHQ checked Sep 30, 2026201-500241 contacts →

Indirect evidence

“Crown Technical Systems, a Flex company, is headquartered in Fontana, California, with additional production and engineering facilities in Dallas, Texas, and Ontario, Canada.”

Source: RevenueBase Database · checked Sep 30, 2026
13Indirect evidenceBristol, VA, United StatesHQ checked Sep 30, 2026501-1,000221 contacts →

Indirect evidence

“Electro-Mechanical, LLC is a global leader in developing and manufacturing technologies used for electrical power distribution switching, power quality and power protection…”

Source: RevenueBase Database · checked Sep 30, 2026
14Indirect evidencePrice, UT, United StatesHQ checked Sep 30, 2026501-1,000208 contacts →

Indirect evidence

“IE provides custom-engineered, packaged equipment to industrial markets.”

Source: RevenueBase Database · checked Sep 30, 2026
15Strong evidenceMontgomery, AL, United StatesHQ checked Sep 30, 2026201-500202 contacts →

Strong evidence

“HD Hyundai Power Transformers USA, Inc, a subsidiary of HD Hyundai Electric Systems, stands as a premier transformer manufacturer located in Montgomery, Alabama.”

Source: RevenueBase Database · checked Sep 30, 2026
16Indirect evidenceBordentown, NJ, United StatesHQ checked Sep 30, 2026201-500177 contacts →

Indirect evidence

“NWL Inc.”

Source: RevenueBase Database · checked Sep 30, 2026
17Strong evidenceAthens, GA, United StatesHQ checked Sep 30, 20261,001-5,000174 contacts →

Strong evidence

“Power Partners is a leading manufacturer of distribution transformers in North America.”

Source: RevenueBase Database · checked Sep 30, 2026
18Strong evidenceCanonsburg, PA, United StatesHQ checked Sep 30, 2026201-500169 contacts →

Strong evidence

“Pennsylvania Transformer Technology LLC (PTT) is a US-owned, industry leading manufacturer of a wide range of sizes and types of power transformers for the investor-owned…”

Source: RevenueBase Database · checked Sep 30, 2026
19Indirect evidenceFranklin Park, IL, United StatesHQ checked Sep 30, 2026501-1,000165 contacts →

Indirect evidence

“For over 100 years, SAI (Switchboard Apparatus, Inc.) has supplied innovative and reliable equipment for electrical power distribution.”

Source: RevenueBase Database · checked Sep 30, 2026
20Partial evidenceVernon, CA, United StatesHQ checked Sep 30, 2026201-500147 contacts →

Partial evidence

“MGM Transformers is now part of Forgent Power Solutions.”

Source: RevenueBase Database · checked Sep 30, 2026
21Indirect evidenceOklahoma City, OK, United StatesHQ checked Sep 30, 2026201-500145 contacts →

Indirect evidence

“In 2025, Southwest Electric Co.”

Source: RevenueBase Database · checked Sep 30, 2026
22Indirect evidencePittsburgh, PA, United StatesHQ checked Sep 30, 20261,001-5,000137 contacts →

Indirect evidence

“HICO America is the North American headquarters for the HICO family of companies, delivering the infrastructure behind today's most ambitious energy projects.”

Source: RevenueBase Database · checked Sep 30, 2026
23Indirect evidenceCaldwell, ID, United StatesHQ checked Sep 30, 20261,001-5,000136 contacts →

Indirect evidence

“Mission Critical Group (MCG) stands apart as an end-to-end power systems and solutions provider, accelerating time-to-power in mission critical environments with unmatched speed…”

Source: RevenueBase Database · checked Sep 30, 2026
24Partial evidenceLake Mary, FL, United StatesHQ checked Sep 30, 2026201-500134 contacts →

Partial evidence

“At JST Power Equipment, we pride ourselves on delivering world-class transformer and electrical equipment solutions.”

Source: RevenueBase Database · checked Sep 30, 2026
25Partial evidenceWinneconne, WI, United StatesHQ checked Sep 30, 2026201-500126 contacts →

Partial evidence

“At Switchgear Power Systems, we engineer and manufacture high quality, custom electrical power distribution equipment with speed, flexibility, and competitive pricing.”

Source: RevenueBase Database · checked Sep 30, 2026

Showing 25 of 258 pad-mounted transformer manufacturers based in the United States

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Pad-mounted transformer manufacturers based in the United States at a glance

As of Sep 30, 2026
36.1%Verified-email coverage
86.8Average contacts per company
11-50Median size (employees)
5.8%Largest-city concentration · Houston
Sep 30, 2026Page data refreshed

Companies by employee count

1-10
73
11-50
78
51-200
54
201-500
19
501-1,000
13
1,001-5,000
17
5,001-10,000
3
10001+
1

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 258 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among pad-mounted transformer manufacturers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in the United States whose own description of what they do matches “pad-mounted transformer manufacturers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search
RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names pad-mounted transformer manufacturers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude
Companies whose own description does not clearly place them among pad-mounted transformer manufacturers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 8,091 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names pad-mounted transformer manufacturers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many pad-mounted transformer manufacturers are there based in the United States?

RevenueBase identified 258 pad-mounted transformer manufacturers headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Schweitzer Engineering Laboratories SEL, headquartered in Pullman, tops this list with the largest team on record.

Which city has the most pad-mounted transformer manufacturers?

Houston leads with 15 headquartered companies, followed by Addison (3) and Bristol (3).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 8,091 verified decision-maker contacts tracked across these 258 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.