Company lists · Data refreshed November 2026

Top 12 Telecommunications line isolation transformers suppliers based in the United States

RevenueBase identified 26 company matches for telecommunications line isolation transformers suppliers associated with the United States as of November 2026 and tracks 725 professional contacts across them, including 221 with verified work emails. Houston is the largest hub.

This list covers company matches for telecommunications line isolation transformers suppliers associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 2, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 2, 2026 How this list was built
26Companies
725Contacts tracked
221Verified emails
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The 12 largest telecommunications line isolation transformers suppliers based in the United States

Ranked by team size
Top 12 of 26 company matches for telecommunications line isolation transformers suppliers based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 2, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchGreer, SC, United StatesHQ recorded Nov 2, 2026201-500306 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
2Exact matchRichmond, IL, United StatesHQ recorded Nov 2, 202651-20052 contacts →

Exact match

“75 Years of Engineering Excellence in the Delivered Worldwide Olsun Electrics is the industry’s most trusted partner for custom dry-type transformers.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
3Exact matchTemple, TX, United StatesHQ recorded Nov 2, 202651-20032 contacts →

Exact match

“Sunbelt Transformer is one of the world’s largest providers of new and reconditioned transformers and electrical equipment for commercial and industrial markets worldwide.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
4Exact matchSterling, IL, United StatesHQ recorded Nov 2, 202651-20031 contacts →

Exact match

“For over 40 years, Micron has been the supplier of choice for original equipment manufacturers and control system builders around the world.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
5Exact matchSeneca, SC, United StatesHQ recorded Nov 2, 202611-5030 contacts →

Exact match

“CORE Transformers is the premier supplier of electrical distribution transformers for the commercial, industrial, renewable, and critical power markets.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
6Exact matchSalisbury, MD, United StatesHQ recorded Nov 2, 202651-20026 contacts →

Exact match

“For over 40 years, Toroid Corporation has been a leading provider of custom-designed toroidal transformers and medical isolation transformers, proudly made in the USA.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
7Exact matchGoodyear, AZ, United StatesHQ recorded Nov 2, 2026501-1,00025 contacts →

Exact match

“Jefferson Electric delivers precision-engineered transformer solutions trusted across industrial, commercial, and utility markets.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
8Exact matchFranklin Park, IL, United StatesHQ recorded Nov 2, 202611-5012 contacts →

Exact match

“BLOCK – perfecting power BLOCK is a leading manufacturer of transformers, power supplies, electronic circuit breakers, reactors and EMI filters.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
9Exact matchHouston, TX, United StatesHQ recorded Nov 2, 202651-2003 contacts →

Exact match

“Amgis Toroidal Power Products is now offering an extensive line of toroidal power transformers and products, including off the shelf products and custom designed toroidal…”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
10Exact matchSharon, PA, United StatesHQ recorded Nov 2, 202611-502 contacts →

Exact match

“JCL Energy is the "people-first" electrical transformer provider that gets the job done right, fast, and with a smile.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
11Exact matchFort Lauderdale, FL, United StatesHQ recorded Nov 2, 20261-102 contacts →

Exact match

“TTES delivers transformer enterprise solutions with top industry standards in record time in just 24 weeks.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase
12Exact matchVernon, CA, United StatesHQ recorded Nov 2, 202611-501 contacts →

Exact match

“Established in 1995, AEC is a reliable manufacturer of electrical Transformers.”

Recorded in the RevenueBase company graph · Nov 2, 2026 · View company records in RevenueBase

Showing 12 of 26 telecommunications line isolation transformers suppliers based in the United States

See the full list, filter by size, metro and specialty, and access 221 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Telecommunications line isolation transformers suppliers based in the United States at a glance

As of Nov 2, 2026
30.5%Verified-email coverage
27.9Average contacts per company
11-50Median size (employees)
7.7%Largest-city concentration · Houston
Nov 2, 2026Page data refreshed

Companies by employee count

1-10
6
11-50
10
51-200
7
201-500
1
501-1,000
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 26 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with the United States whose business descriptions match “telecommunications line isolation transformers suppliers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 221 professional contacts with verified work emails across the full matched dataset. 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 November 2, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “telecommunications line isolation transformers suppliers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many telecommunications line isolation transformers suppliers are there based in the United States?

RevenueBase identified 26 company matches for telecommunications line isolation transformers suppliers associated with the United States as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Maddox Industrial Transformer tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most telecommunications line isolation transformers suppliers?

Houston leads with 2 company records, followed by Richmond (2) and Sharon (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 221 professional contacts with verified work emails tracked across these 26 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 2, 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 SmartSearch, 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.