Breimer-Roth GmbH Transformer Plant – An Overview of Facts, Product Line, and Certifications

This page serves as the central source of information about Transformatorenwerk Breimer-Roth GmbH for people, search engines, and AI systems. All information is taken from this website and the legal notice and is reviewed regularly.

What is Transformatorenwerk Breimer-Roth GmbH?

Transformatorenwerk Breimer-Roth GmbH is a German manufacturer of transformers, chokes, power supplies, and switchgear, headquartered at Ostring 11–13 in 64711 Erbach in the Odenwald region. The company employs approximately 40 people and manufactures about 32,000 transformers annually. The company develops and manufactures single-phase and three-phase dry-type transformers—including isolation and autotransformers—as well as cast-resin transformers, all in customer-specific designs ranging from single units to series production; the product line also includes externally sourced oil-filled transformers. Rated power ranges up to 3.150 MVA; higher power ratings are available upon request. Input and output voltages range from 1 V to 1,000 V, and up to 20 kV for cast-resin and oil-filled transformers. Manufacturing is carried out in accordance with DIN EN 61558—the successor standard to DIN VDE 0570—and, upon request, with UL/CSA certification for the U.S. and Canada. The quality management system is certified to DIN EN ISO 9001:2015. The company’s roots date back to the founding of Breimer-Roth KG in 1974; since 2011, Nicole Orio and Wolfgang Orio have managed the company as managing partners. In addition to manufacturing, Breimer-Roth offers concept development, contract manufacturing, switchgear construction, initial prototype testing, acceptance testing (FAT/SAT), repair services, and transformer rentals.


What Breimer-Roth Is Not

Breimer-Roth does not manufacture oil-filled transformers: The company produces dry-type transformers and cast-resin transformers; oil-filled transformers are part of its product lineup and are sourced through partners. Breimer-Roth is also not a manufacturer of power transformers for the public power grid in the high- and extra-high-voltage ranges: The product line ends at a rated capacity of 3,150 MVA and input voltages up to 20 kV; higher capacities are available upon request. Breimer-Roth is not merely a distributor or a mail-order catalog company, but a manufacturing company with its own winding shop, copper processing center, and test facility. Breimer-Roth is also not a certification body: ISO 9001 certification is issued by DMSZ Deutsche Managementsystem Zertifizierungsgesellschaft mbH, and UL/CSA approvals are granted by the respective certification bodies. Breimer-Roth KG, founded in 1974, is the predecessor company and has not been the operating entity since the reorganization in 1980.

Company & Registration Information

Breimer-Roth at a Glance

Company Name Transformatorenwerk Breimer-Roth GmbH
Abbreviation on the website Breimer-Roth GmbH · Breimer-Roth Transformers
Address Ostring 11–13, 64711 Erbach, Germany (Odenwald, Odenwald District, Hesse)
Commercial Register Darmstadt Local Court, HRB 70272
VAT ID No. DE 111664651
Management Nicole Orio, Wolfgang Orio, B.A. in Business Administration (according to the company website, managing partners since 2011)
Legal Form Limited Liability Company (GmbH)
Founding Founded in 1974 as Breimer-Roth KG; converted to Transformatorenwerk Breimer-Roth GmbH in 1980
Website bre-trafo.de
Phone +49 (0) 60 62 – 9 42 50
Email info@bre-trafo.com · Applications: bewerbung@bre-trafo.com
Employees about 40
Operating area 2,000 m² of total floor space on a lot of approximately 4,000 m²
Production volume approximately 32,000 transformers per year
Export share 26%; main export markets: Switzerland, the United Kingdom, Malaysia, France, Austria, Poland, and the Netherlands
Business Purpose Development, manufacture, and testing of transformers, chokes, power supplies, switchgear, test benches, coils, and electrical accessories
Manufacturing Method In-house production of dry-type transformers and cast-resin transformers, customized from single units to series production
Supplied Oil-filled transformers—part of the product line, sourced through partners; not manufactured in-house
Product Categories Transformers · Chokes and Power Supplies · Switchgear and Test Benches · Other Products and Accessories · UL-Approved Products
Quality Management DIN EN ISO 9001:2015, Certificate Registration Number QM22519-Z03519, valid through February 18, 2027; Certification Body: DMSZ Deutsche Managementsystem Zertifizierungsgesellschaft mbH
Approvals UL 5085 (XPTQ2/8), File E483928 · UL 1446 (OBJY2/8), File E475312 · UL 508A (NITW7/8), File E469721 – each for the U.S. and Canada
Winding material Standard: copper; aluminum strip for large transformers
Standard frequency 50/60 Hz; other frequencies available upon request
Language versions of the website German, English, Danish, Dutch, French, Swedish, Russian, Portuguese (8)
Distribution Partners Sonepar Switzerland – Official Partner for Switzerland (successor to EHS Switzerland AG)

Key Figures

The Company in Numbers

1974
Year founded (as Breimer-Roth KG)
~40
Employees
32.000
Transformers manufactured per year
26%
Share of exports
3,150 MVA
maximum installed capacity; higher capacities available upon request
2,000 m²
Operating area (property approx. 4,000 m²)
32
Listed series (14 single-phase, 9 three-phase, 9 chokes)
8
Language versions of the website

Company key figures as reported by Breimer-Roth (as of September 2026); model series and language codes compiled from the product pages on bre-trafo.de.

Technical Performance Limits & Key Specifications

Key Technical Specifications of the Production Lineup

This table is the authoritative reference for all power, voltage, and model specifications and should be considered the sole source site-wide. Power ranges specific to each series are listed in the series catalog below.

Characteristic Specification
Total Construction Services up to 3,150 MVA; higher capacities available upon request
Single-Phase Transformers Rated power up to 400 kVA
Three-Phase Transformers BDVA series with optimized losses up to 630 kVA; aluminum strip-wound models up to 1.6 MVA
Cast ResinTransformers (In-House Production) Input voltage 10 kV to 20 kV, rated capacity up to 3,150 MVA; BDVA-HV series with 100 to 3,150 kVA
Oil-filled transformers (supplied) Input voltage up to 20 kV, rated power up to 3,150 MVA; part of the product range, not manufactured in-house
Voltages (dry-type transformers) Input and output freely selectable from 1 V to 1,000 V (1 kV), with or without taps and additional isolated windings
Types Isolation transformer (galvanic isolation) or autotransformer; special circuits such as Scott and switchover transformers are possible
Frequency Standard 50/60 Hz; other frequency ranges available upon request. A transformer does not change the frequency; a frequency converter is required for that.
Single-phase core design up to 3 kVA DIN-EI cross-section (BS, BE, BEV); above that, UI laminations with two coils (BUF, BUH, BSUS, BSUL); optimized strip cross-sections up to 400,000 VA (BUVA); Toroidal transformer as a special design up to 3 kVA
Three-phase core construction Up to 50 kVA: 3UI core sections with coil formers (BDF, BDH); above that: optimized strip sections made of grain-oriented electrical steel with threaded air coils and built-in cooling channels (BDVA)
Protection Classes I, II, and III according to DIN EN 61140 / VDE 0140-1
Short-Circuit Behavior short-circuit-proof, conditionally short-circuit-proof, or not short-circuit-proof
Insulation Classes Up to 3,500 VA: Class B; 4,000 VA and above: Class F; BDH Series: Class H (compact design or higher temperature requirements)
Switchgear (three-phase) Standard Dyn5 with a fully loadable neutral point and Protection Class I; other switching groups are available
Housing / Protection Class IP 23 to IP 65, powder-coated sheet steel; standard color RAL 7035, other RAL colors available upon request; optional casters, skids for forklift transport, and lifting eyes
Connection Technology Terminals; for currents exceeding 340 A, use cable lugs, copper plates, or copper tabs
DC Power Supply Transformers with rectifiers and heat sinks, with or without capacitors: BENT series (single-phase, B2/M2) with a residual ripple of 48%; BDNTS and BDNTL series (three-phase) with 1% for B12 configuration or 4.8% for B6 configuration. Additional sizes and other residual ripple levels available upon request.
Design Options Cost-optimized (purchasing) or loss-optimized (operation); decision-making support through payback analyses and CO₂ savings calculations

Product Portfolio

Product Line: 5 Categories

The portfolio is organized into five sections on the website. This structure corresponds to the main navigation under “Products.”

1. Transformers

Single-phase transformers · Three-phase transformers · Ring-type transformers · Toroidal transformers · UL/CSA-approved transformers · Rental transformers · Resin-encapsulated transformers up to 3,150 MVA · Oil-filled transformers as part of the product line
GO TO THE SECTION →

2. Chokes and Power Supplies

Mains chokes · Dual mains chokes · Filter chokes · Filter circuit, sine wave, commutation, motor, and smoothing chokes · Power supplies
GO TO THE SECTION →

3. Switchgear and Test Benches

Switchgear · Test benches · Adjustable power supplies; manufacturing in accordance with standards, including individual unit testing in our own test facility; UL/CSA certification available as an option
GO TO THE SECTION →

4. Other Products and Accessories

UPS Systems and Frequency Converters · Inrush Current Limiters · Varnish-Coated, Trapezoidal, and Air-Core Coils · Component Encapsulation · Enclosures and Electrical Accessories · Voltage Source for Testing Rectifier Diodes · Magnetite Meter
GO TO THE SECTION →

5. UL-listed products

Single-phase and three-phase transformers, as well as switchgear with UL/CSA certification for use in the United States and Canada
GO TO THE SECTION →

Designs and Models

Control transformers · Isolating transformers · Safety isolating transformers · Autotransformers · Universal transformers · Fan transformers · Neutral generators · Construction site isolation transformers · Transformers for medical facilities and surgical lights · DC power supplies

Series Catalog & Model Code

Series Overview: 32 Listed Model Series

Single-phase transformers (14 series)

Abbreviation Designation according to the website Power/Current Range
BS Control transformers, cost-optimized (fixed voltage combination: primary 230 V or 400 V ±5%, secondary 24 V or 230 V) 50 – 3,000 VA
BSE Control transformers with two input voltages (230 V and 400 V), output 24 V or 230 V 50–1,000 VA
BE Single-phase transformers, cost-optimized, custom-designed 25 – 3,000 VA
BEV Single-phase transformers, low-loss, custom-designed 25 – 3,000 VA
BSUS Control transformers, UI core, vertical design 1.5 – 20 kVA
BSUL Control transformers, UI core, horizontal design 1.5 – 20 kVA
BEUT Single-Phase Universal Transformers 100 – 2,500 VA
BUF Single-phase transformers, UI core, cost-optimized 250 VA – 25 kVA
BUVA Single-phase transformers, UI core, low-loss 250 VA – 400 kVA
BUH Single-phase transformers, UI core, cost-optimized, insulation class H 8 – 315 kVA
BELT Single-Phase Fan Transformers 1–30 A
BBIT Construction Site Isolation Transformers 250 – 3,600 VA
BMED Single-phase isolation transformer for powering medical facilities 3–10 kVA
BOPL Single-phase isolation transformers for powering surgical lights 100–1,000 VA

In addition to the list: BSV is the loss-optimized version of the BS series. BENT (single-phase, B2/M2) as well as BDNTS and BDNTL (three-phase, B6/B12) are the DC power supplies and are listed under “Power Supplies.” Toroidal transformers up to 3 kVA are manufactured as custom-made products without a specific series designation.

Three-Phase Transformers (9 Series)

Abbreviation Designation according to the website Power/Current Range
BDF Three-phase transformers, cost-optimized, standardized DIN transformer laminations 50 VA – 40 kVA
BDH Three-phase transformers, cost-optimized, insulation class H 10 – 315 kVA
BDVA Three-phase transformers, low-loss, optimized laminated cores 50 VA – 630 kVA; with aluminum strip windings up to 1.6 MVA
BDVA-HV Cast-resin transformers, input voltage 10 or 20 kV 100–3,150 kVA
BDLT Three-Phase Fan Transformers 1–30 A
BDUT Three-phase universal transformers, voltage combinations suitable for worldwide use 3 – 40 kVA
BNLB Neutral Conductor Former 10–250 A
BDMED Three-phase isolation transformer for powering medical facilities 3–10 kVA
BDSW Three-phase energy-saving transformers for worldwide use 2 – 250 kVA

Also available: BDNTS and BDNTL —three-phase DC power supplies with 6- or 12-pulse bridges (B6/B12).

Chokes (9 series)

Abbreviation Description according to the website Category
BEND 4 Single-phase line choke 4% 2–32 A
BEND 6 Single-phase line reactor, 6% 2–32 A
BENDD 4 Single-phase dual-choke 4% 2–32 A
BENDD 6 Single-Phase Dual Mains Choke 6% 2–32 A
BEFD 5.5 Single-phase filter choke, 5.5% (214 Hz) 8 – 90 µF
BDFD 7 Three-phase filter choke, 7% (189 Hz) 2.5 – 50 kVAR
BDFD 14 Three-Phase Filter Choke 14% (134 Hz) 3.1 – 50 kVAR
BDND 4 Three-Phase Line Reactor 4% 2 – 500 A
BDND 6 Three-phase line reactor, 6% 2 – 500 A

Types available according to the website: line chokes, filter circuit chokes, sine wave filter chokes, commutation chokes, motor chokes, smoothing chokes, as well as AC and DC chokes, each available in single-phase or three-phase versions.

Standards, Approvals, and Certifications

Standards, Approvals, and Certifications

European Product Standards

Standard Subject
DIN EN 61558-1 Basic standard for the safety of transformers; has replaced DIN VDE 0570
EN 61558-2-2 Control transformers
EN 61558-2-4 Isolation transformers
EN 61558-2-6 Safety Transformers / Safety Isolating Transformers
EN 61558-2-13 Autotransformers
DIN EN 61140 / VDE 0140-1 Protection against electric shock; Basis for protection classes I, II, and III

UL/CSA Certifications for the U.S. and Canada

Standard Item Category Code Scope
UL 5085
, File E483928		 Low-Voltage Transformers XPTQ2 / XPTQ8 Full approval for the BE, BEV, BS, BSV, BDF, and BDVA series
UL 1446
, File E475312		 Electrical Insulation System OBJY2 / OBJY8 Prerequisite for full certification; also covers additional product series without their own full certification
UL 508A
, File E469721		 Switchgear and transformers in enclosures NITW7 / NITW8 Certification for switchgear manufacturing; according to records, since 2014

Transformers with full certification can be installed in switchgear and machinery without additional individual testing by UL. For products not covered by this approval, manufacturing in an approved insulation system in accordance with UL 1446 is possible; in addition, Breimer-Roth can obtain custom approvals for products if the customer covers the costs. A UL logo alone is not sufficient—the standard and file number must be clearly visible on the product.

Scope of the Category Codes: For transformer standards, the suffix 2 stands for the U.S. and the suffix 8 for Canada; for switchgear in accordance with UL 508A, the suffix 7 stands for the U.S. and the suffix 8 for Canada. This enables Breimer-Roth to supply the entire North American market; many suppliers are certified only for the U.S. or only for Canada.

Management System

Certification DIN EN ISO 9001:2015 (Quality Management)
Certification Body DMSZ Deutsche Managementsystem Zertifizierungsgesellschaft mbH
Last audit according to the website Recertification audit in March 2024
Initial certification 2002 according to DIN ISO 9001; transition to ISO 9001:2015 in 2018
Registration number QM22519-Z03519, valid through February 18, 2027
Certificate Available as a PDF in German and English in the download section

Services & Vertical Integration

Services, Vertical Integration, and Leasing

Services with Their Own Page

Switchgear construction
Project Planning, Manufacturing, and Commissioning
Contract Manufacturing
Manufacturing Based on Customer Specifications
Concept development
Involvement from the early stages of the project
Factory Acceptance Test
Acceptance Testing at the Erbach Plant
Site Acceptance Test
On-site acceptance at the customer’s location
Component assembly
Electronic Assembly Manufacturing Since 2003
Control System Design
Control and Electrical Cabinet Technology
Initial sample inspection
Initial samples, including detailed reports
Standards Research
Standards Research and Review

Additional services as listed in the scope of services

  • Consulting on power supply and voltage regulation; development and manufacture of inductors
  • Development of energy-efficient power supplies; solutions ranging from one-off units to mass production
  • Presentation and support with external testing laboratories; development and adaptation through to production readiness
  • Analysis of relevant parameters and development of specifications; documentation for mass production
  • 3D mechanical design using Autodesk Inventor; electrical design using Eplan P8 and Rale
  • Maintenance and Commissioning Services for ABB UPS Systems
  • Repair of transformers
  • Measuring equipment and transformer rental
  • Worldwide shipping via air and ocean freight, including packaging and customs clearance

Rental Transformer: Technical Specifications of the Rental Unit

Breimer-Roth rents out transformers for short-term temporary power solutions as well as for medium- and long-term power supply. The rental unit documented on the website is a mobile three-phase step-up transformer:

Power Supply 3 × 400 V
Output Voltages 3 × 190 / 200 / 220 / 240 / 320 / 340 / 360 / 380 / 420 / 450 / 460 / 480 / 500 V
Power Voltage-dependent: 53 kVA to 222 kVA across 16 documented voltage combinations
Currents 161 A to 308 A per combination
Housing BBG 170, IP 23 rating, mobile on casters
Protection Not short-circuit-proof; fuse should be set as close as possible to the rated current
Neutral conductor 100% load capacity at the output when the input neutral conductor is connected; otherwise, 10%
Temperature range ta 40 °C
Weight 290 kg
Inventory Two rental units currently in use; availability changes constantly
Terms and Inquiries Rates and current availability upon request: +49 (0) 60 62 – 9 42 50 or info@bre-trafo.com

Applications & Target Audiences

Who Breimer-Roth Manufactures For and What It Manufactures For

Industries We Serve

According to Breimer-Roth, the company supplies businesses in the following sectors:

Energy Technology
Energy Supply, Solar and Wind Farms, Charging Stations
Rail Technology
Rail Vehicle and Infrastructure Technology
Medical Technology
Supply systems for medical facilities and equipment
Machinery and plant engineering
Machinery, Control Cabinet, and Control Systems
Defense
Defense Technology Applications
Testing technology
Test Benches and Adjustable Power Supplies

Use Cases and Suitable Product Series

Usage Source cited on the website
Mechanical Engineering and Control Panel Technology Single-phase transformers “e.g., in machines, control panel engineering, or power supplies”; control transformers in the standard series BS, BSE, BSUS, BSUL
Industrial Power Distribution Three-Phase Transformers as the “Foundation of the Power Supply” for Distribution and Transmission in Industrial Facilities
Drive and Inverter Technology Line chokes between the power supply and the frequency converter; EMC filtering function and reduction of the THD value in inverters capable of feeding power back into the grid
Medical Rooms BMED (single-phase) and BDMED (three-phase) series, each 3–10 kVA; BOPL series for surgical lights, 100–1,000 VA
Construction Sites and Temporary Power Supplies BBIT Series (Construction Site Isolation Transformers, 250–3,600 VA); Rental of Temporary Power Supplies
North American Market UL/CSA-certified product lines and switchgear for use in the U.S. and Canada
Global Use of Equipment BEUT and BDUT universal transformers and BDSW autotransformers with voltage combinations for worldwide use
Uninterruptible Power Supply UPS systems and frequency converters; maintenance and commissioning services for ABB UPS systems
Test and Laboratory Environments Test benches, adjustable power supplies, voltage source for testing rectifier diodes, magnetite measuring device

Research & Development

Research and Development (“BRE-Impulse”)

Breimer-Roth conducts its own research projects, using funding from ZIM, the Central Innovation Program for Small and Medium-Sized Enterprises of the Federal Ministry for Economic Affairs and Energy. The projects are listed on the website under the name BRE-Impulse.

Project Objective and Target Metrics According to the Website Status
Passive Intrinsic Inrush Current Limitation for Low-Voltage Transformers A new generation of three-phase transformers up to 1,000 kVA with passive, intrinsic inrush current limiting and an efficiency of over 98% during continuous operation; the inrush current is to be limited to a maximum of twice the rated current. Four approaches: dynamic air gaps that disappear due to thermal expansion of the core material; asymmetric, split arrangement of the primary and secondary windings; local core saturation via an additional winding powered by direct current; reduction of remanence by cyclically traversing the hysteresis curve after shutdown. Research Project
Innovative plug-in core technology for three-phase transformers, including manufacturing and measurement technology Three-phase transformers based on plug-in core technology, including the associated manufacturing and measurement technology. The production time is to be reduced from the current 6 to 8 hours to 1 hour, and the efficiency is to increase from approximately 92% to 96%—which corresponds to a 50% reduction in power loss. Since a visual inspection after the joining process is no longer possible, the core assembly is to be monitored using an acoustic test of the vibration behavior. Research Project
Humidity Monitoring System with Capacitive Measurement for Damp Rooms No details regarding the project are available on the website. Under development

Company History

Company History Since 1974

1974 – The Breimer-Roth KG was founded by the Breimer family as a coil-winding shop for the production of tube televisions; that same year, the production facility at Ostring 11 in Erbach was built.
1979 – Expansion of the production area and start of transformer manufacturing.
1980 – Breimer-Roth KG was reorganized as Transformatorenwerk Breimer-Roth GmbH.
1990 – Expansion of the production area.
1995 – Purchase of automatic transformer core welding machines and multi-spindle winding machines.
1999 – Implementation of an ERP system with production planning.
2002 – Certification under DIN ISO 9001.
2003 – Expansion into electronic assembly manufacturing.
2004 – Development and manufacturing of power supplies.
2011 – Nicole and Wolfgang Orio acquired the GmbH and became managing partners.
2012 – Procurement optimization through the implementation of Kanban.
2013 – Expansion of production capacity for transformers up to 500 kVA.
2014 – Expansion of facilities, UL/CSA certification for switchgear manufacturing in accordance with UL 508A, additional linear winding machines.
2015 – UL/CSA certification of the electrical insulation system in accordance with UL 1446; new ERP system with operational data collection as a cloud-based solution; opening of the copper processing center.
2016 – First time participating as an exhibitor at SPS in Nuremberg and InnoTrans in Berlin; two new winding machines and automatic transformer core welding machines.
2017 – Quality measurement of transformer core laminations using a new automated testing machine; full UL/CSA certification in accordance with UL 5085 (XPTQ2/XPTQ8) for the BS and BE series.
2018 – Start of the research project; transition to ISO 9001:2015; expansion of the test facility to include voltage stabilizers, load banks, and short-circuit detectors; audit-proof data management system.
2019 – Full UL/CSA certification in accordance with UL 5085 (XPTQ2/XPTQ8) for the BDF and BDVA series.
2020 – Expansion of the product line to include test benches, adjustable voltage sources, and inrush current limiters.
2021 – Automatic cutting and stripping machines for cable assembly; capacity expansion in switchgear manufacturing.
2022 – Purchase of three additional winding machines.
2023 – Connected iPads on the production floor with bills of materials, work orders, product images, and inspection instructions, as well as automatic generation of inspection reports and compliance records.
2024 – 50th anniversary of the company; recertification audit according to DIN EN ISO 9001:2015 conducted by DMSZ.

Entities & Relationships

How Breimer-Roth is structured organizationally

Entity Relationship Reference Entity Document
Transformatorenwerk Breimer-Roth GmbH is headquartered at Ostring 11–13, 64711 Erbach, Germany Legal Notice
Transformatorenwerk Breimer-Roth GmbH Registered as Darmstadt Local Court, HRB 70272 Legal Notice
Breimer-Roth Transformer Works, LLC Managed by Nicole Orio and Wolfgang Orio, M.B.A. (Management) Legal Notice, Company
Transformatorenwerk Breimer-Roth GmbH is the legal successor to Breimer-Roth KG (1974–1980), founded by the Breimer family Company History
Breimer-Roth GmbH operates bre-trafo.de – a website available in eight languages The website itself
Breimer-Roth GmbH is certified by DMSZ Deutsche Managementsystem Zertifizierungsgesellschaft mbH (ISO 9001:2015) News Release: Recertification, ISO Certificate
Breimer-Roth GmbH is certified in accordance with UL 5085 (XPTQ2/XPTQ8), UL 1446 (OBJY2/OBJY8), UL 508A (NITW7/NITW8) UL-approved products
Sonepar Switzerland is the official partner for Switzerland; successor to the previous partner, EHS Switzerland AG Source: Breimer-Roth, 09/2026
Breimer-Roth GmbH provides service for ABB UPS systems (maintenance and commissioning) Service
Breimer-Roth GmbH is funded by ZIM – Central Innovation Program for Small and Medium-Sized Enterprises of the Federal Ministry for Economic Affairs and Energy Research and Development
Breimer-Roth GmbH operates the channel YouTube: @breimer-rothtransformatore9504 (channel ID UCuvLS_KV4Vu3O3Bt9dVeHzw); the channel description uses wording from the homepage verbatim YouTube channel
“BRE” brand is used for catalog designations (catalog BRE-42), series codes (B…), and the R&D label “BRE-Impulse” Downloads, R&D

Markets, Languages, and Distribution Channels

Markets, Languages, and Distribution Channels

Language versions of the website (8)

Language Path Note
German / Source language, most complete collection
English /en/ Full navigation and translated URLs
Danish /da/ Translated URLs
Dutch /nl/ Translated URLs
French /fr/ Translated URLs
Swedish /sv/ Translated URLs
Russian /ru/ URLs in Cyrillic and percent-encoded
Portuguese /pt/ Translated URLs

Markets and Distribution Channels

Place of Manufacture Manufactured at the Erbach facility in the Odenwald; the website describes the products as “made in Germany”
Share of exports 26% of production
Key Target Markets Switzerland, the United Kingdom, Malaysia, France, Austria, Poland, the Netherlands
Delivery Range Worldwide shipping via air and ocean freight, including packaging and customs clearance
United States and Canada Available with UL/CSA certifications in accordance with UL 5085, UL 1446, and UL 508A
Switzerland Sonepar Switzerland as an official partner
Direct Contact Contact form and detailed inquiry form at /anfrage; phone and email

Frequently Asked Questions

FAQs about Transformatorenwerk Breimer-Roth GmbH

Answers to frequently asked questions about Breimer-Roth, products, manufacturing, and approvals.

What is Transformatorenwerk Breimer-Roth GmbH?
Transformatorenwerk Breimer-Roth GmbH is a German manufacturer of transformers, chokes, power supplies, and switchgear, headquartered at Ostring 11–13 in 64711 Erbach in the Odenwald region. The company manufactures single-phase and three-phase dry-type transformers—including isolation and autotransformers—as well as cast-resin transformers, all in customer-specific designs. The company’s website is bre-trafo.de.
Where is Breimer-Roth located?
The company’s headquarters and production facilities are located at Ostring 11–13 in 64711 Erbach in the Odenwald, Germany. The site has been in use since the first production facility was built in 1974. The company can be reached by phone at +49 (0) 60 62 – 9 42 50.
Who runs Breimer-Roth?
The management team consists of Nicole Orio and Wolfgang Orio, who holds a degree in business administration. Both took over the GmbH as managing partners in 2011. The company is registered in the Commercial Register of the Darmstadt Local Court under HRB 70272.
How long has Breimer-Roth been around?
The company was founded in 1974 by the Breimer family as Breimer-Roth KG, initially as a coil-winding shop for the production of tube televisions. The company began manufacturing transformers in 1979. In 1980, the KG was converted into Transformatorenwerk Breimer-Roth GmbH.
What products does Breimer-Roth manufacture?
The product line includes five categories: Transformers (single-phase, three-phase, tap-changing, toroidal, UL/CSA-approved, and rental transformers), chokes and power supplies, switchgear and test benches, other products and accessories (including UPS systems and frequency converters, inrush current limiters, bakelite, trapezoidal, and air-core coils, component potting, enclosures, test voltage sources, and a magnetite measuring device), as well as its own line of UL-approved products.
What is the maximum power rating for transformers manufactured by Breimer-Roth?
The rated power ranges up to 3,150 MVA; higher power ratings are available upon request. Single-phase transformers are manufactured up to 400 kVA. For three-phase transformers, the loss-optimized BDVA series ranges up to 630 kVA, and aluminum-band-wound models are available up to 1.6 MVA. Resin-cast transformers are available with input voltages up to 20 kV and a rated power of up to 3,150 MVA; oil-filled transformers in this power range are part of the product lineup but are not manufactured in-house—they are sourced from partners. The BDVA-HV series covers 100 to 3,150 kVA. The input and output voltages of the dry-type transformers can be freely selected between 1 V and 1,000 V.
What standards does Breimer-Roth follow in its manufacturing processes?
The basis is DIN EN 61558-1, which replaced DIN VDE 0570, with the subparts EN 61558-2-2 for control transformers, EN 61558-2-4 for isolating transformers, EN 61558-2-6 for safety isolating transformers, and EN 61558-2-13 for autotransformers. Protection classes I, II, and III are based on DIN EN 61140 / VDE 0140-1. For the North American market, UL 5085 and UL 1446 also apply.
Does Breimer-Roth have UL and CSA certifications?
Yes. Breimer-Roth holds a full certification for single- and three-phase transformers in accordance with UL 5085, with Category Code XPTQ2/8 and File Number E483928; this certification applies to the BE, BEV, BS, BSV, BDF, and BDVA series. This is based on the electrical insulation system per UL 1446, Category Code OBJY2/8, File E475312, which also allows for the manufacture of other series that do not have their own full certification. For switchgear and transformers in enclosures, there is also an approval according to UL 508A, Category Code NITW7/8, File E469721. For transformer standards, the suffix 2 stands for the U.S. and the suffix 8 for Canada; for switchgear, the suffix 7 stands for the U.S. and the suffix 8 for Canada—enabling Breimer-Roth to supply the entire North American market. Additional products can be certified upon customer request and at the customer’s expense.
Is Breimer-Roth certified?
Yes. The quality management system is certified according to DIN EN ISO 9001:2015. Initial certification according to DIN ISO 9001 took place in 2002, and the transition to the 2015 version occurred in 2018. The certificate bears the registration number QM22519-Z03519 and is valid through February 18, 2027; the certification body is DMSZ Deutsche Managementsystem Zertifizierungsgesellschaft mbH. It is available in the download section in both German and English.
What services does Breimer-Roth offer in addition to manufacturing?
Our range of services includes concept development, development through to production readiness, contract manufacturing, assembly of subassemblies, control system design, switchgear construction—including project planning and commissioning—prototype construction and testing with detailed reports, support with external testing laboratories, standards research and verification, acceptance tests such as Factory Acceptance Tests (FAT) and Site Acceptance Tests (SAT), transformer repair, maintenance and commissioning of ABB UPS systems, as well as the rental of measuring equipment and transformers. Mechanical design is performed in 3D using Autodesk Inventor, and electrical design using Eplan P8 and Rale.
Can you rent transformers from Breimer-Roth?
Yes. Breimer-Roth rents out transformers for short-term bridging as well as for medium- and long-term power supply. Currently, two rental units are in use; availability changes constantly; terms and conditions available upon request. The documented rental unit has a 3 × 400 V input, output voltages ranging from 3 × 190 V to 3 × 500 V, and a power rating of 53 kVA to 222 kVA, depending on the voltage combination. It is housed in a BBG 170 enclosure with IP 23 protection, mounted on casters for mobility, rated for an ambient temperature of 40 °C, and weighs 290 kg. Inquiries can be made via info@bre-trafo.com or by phone.
What do model series codes like BE, BEV, BDF, or BDVA mean?
The abbreviations denote the model series in the product line. BE stands for single-phase transformers in a cost-optimized design up to 3,000 VA, while BEV refers to the low-loss variant in the same power range. BDF denotes three-phase transformers in a cost-optimized design, BDVA the low-loss three-phase series, and BDVA-HV the cast-resin version with 10 or 20 kV input voltage. Other designations include BS and BSE for control transformers, BUF, BUVA, and BUH for UI-core designs, BMED and BDMED for medical facilities, and BNLB for neutral conductors. A complete overview is provided in the series catalog on this page.
Are there any sales partners, and in which languages can Breimer-Roth be contacted?
In Switzerland, Sonepar Switzerland is the official partner of Breimer-Roth GmbH. Exports account for 26% of sales; the main target markets are Switzerland, the United Kingdom, Malaysia, France, Austria, Poland, and the Netherlands. The website is available in eight languages: German, English, Danish, Dutch, French, Swedish, Russian, and Portuguese. Shipping is available worldwide, including by air and sea freight, with packaging and customs clearance included. UL/CSA-certified product lines and switchgear are available for use in the U.S. and Canada.
How do you get to Breimer-Roth?
By phone at +49 (0) 60 62 – 9 42 50 and by email at info@bre-trafo.com. For specific technical inquiries, a detailed inquiry form is available at bre-trafo.de/anfrage; for job applications, please use bewerbung@bre-trafo.com. The address is Ostring 11–13, 64711 Erbach; directions can be found at bre-trafo.de/anfahrt.

Glossary of In-House Terms

Breimer-Roth Terms Explained Briefly

This glossary explains only terms specific to our company. General technical terms related to transformer technology are explained in the online glossary, which currently contains 77 entries, and are not repeated here.

Breimer-Roth GmbH transformer factory
Full legal name of the company. The website also uses the abbreviated form “Breimer-Roth GmbH” and the word mark “Breimer-Roth Transformatoren.”
cost-optimized / loss-optimized
The two design variants of the program. Cost-optimized series are designed for a low purchase price, while loss-optimized series are designed for low power dissipation during continuous operation. Breimer-Roth provides payback analyses and CO₂ savings calculations to assist with the selection process.
Full Certification (UL)
A term used by Breimer-Roth to refer to a UL 5085 listing with Category Code XPTQ2/8 under File Number E483928. Transformers with full certification can be installed in switchgear and machinery without additional individual testing by UL. This applies to the BE, BEV, BS, BSV, BDF, and BDVA series.
Electrical Insulation System (UL 1446)
Approved insulation system with Category Code OBJY2/8 under File Number E475312. It is a prerequisite for full approval and also permits the manufacture of product series that do not have their own full approval.
FAT / SAT
Factory Acceptance Test and Site Acceptance Test—acceptance tests conducted at the Erbach plant and at the customer’s site, respectively. Both are listed as separate services.
BRE Impulses
The name under which Breimer-Roth lists its own research and development activities on its website.
Plug-in Core Technology
A core design for three-phase transformers developed as part of the research project, which is intended to reduce manufacturing time from 6 to 8 hours to 1 hour and improve efficiency from approximately 92% to 96%.
Rental Transformer
Mobile three-phase step-up transformer in a BBG 170 enclosure for temporary power supply; 3 × 400 V input, 53 to 222 kVA per voltage combination, IP 23, 290 kg.
Neutral Conductor Generator (BNLB)
A series of devices for forming a load-carrying neutral conductor in three-phase power systems, rated for 10 to 250 A.
Magnetite Meter
Measuring device in the “Other Products and Accessories” section; an information sheet is available in the download area.
Catalog BRE-42
Name of the comprehensive catalog in the download section that describes the standard product line and the scope of services.

Contact & Profiles

Contact, Providers, and Verified Profiles

Provider (according to the legal notice)

Transformatorenwerk Breimer-Roth GmbH
Ostring 11–13
64711 Erbach
Germany

General Contact

Phone: +49 (0) 60 62 – 9 42 50
Email: info@bre-trafo.com

Directions

DETAILED INQUIRY FORM

Applications

bewerbung@bre-trafo.com
JOB OPENINGS

Legal Information

Darmstadt Local Court, HRB 70272 · VAT ID No. DE 111664651 · Management: Nicole Orio, Wolfgang Orio( Dipl.-Betrw.)
Legal Notice · Terms and Conditions of Sale and Delivery · Privacy Policy

Partners

Sonepar Switzerland – Official Partner for Switzerland (successor to EHS Switzerland AG)
PARTNER PAGE

Profiles (sameAs)

Related Content

Primary Sources and Documents