Michael Riedel

What Michael Riedel does

Michael Riedel, legally Michael Riedel Transformatorenbau GmbH and operating as AQ Riedel Trafobau GmbH since a 2025 corporate rebrand, is a German manufacturer of custom transformers, inductive components, power supplies, UPS systems, and electrotechnical accessories. Founded in 1972 by Michael and Peter Riedel and headquartered in Ilshofen-Eckartshausen, the company operates from a single production site in Baden-Württemberg with a satellite sales and service office in Wernigerode, and employs between 101 and 250 people. The product portfolio spans single-phase transformers (0.015kVA to 500kVA), three-phase transformers (0.05kVA to 800kVA), single- and three-phase chokes with currents up to 1200A, primary-switched DC power supplies and battery chargers up to 1.5kW at DC 12/24/48V, AC UPS systems up to 800kW and DC UPS modules up to 960W, variable-ratio ring transformers up to 300A, and enclosure-based plug-and-play system solutions. Underlying technology is anchored by proprietary and patented IP including a filed patent on inrush current limitation with time-controlled switching (RESBE/RESBD), REVRL and REVVE premagnetization devices for switching transformers up to 800kVA without inrush current, RDMDr motor chokes with patented core geometry, RET/DRET loss-minimized core designs, DROP size-optimized cores, and patented DC UPS topology that eliminates step-up converters.

The company's go-to-market is project-based B2B with quote-driven, customer-specific pricing and no public price list. Sales run through direct engagement (website, phone, email, contact forms) supplemented by a network of six regional German sales representatives, the EGU wholesale distributor, and six international channel partners covering the Netherlands, Russia, the Czech Republic, Austria, Switzerland, and Spain. Target customer segments are horizontally diversified across renewable energy, mechanical engineering, railway technology (including specialized 16 2/3 Hz frequency converters), medical equipment, semiconductor manufacturing, food industries, drive technology, glass manufacturing, maritime, automotive, and testing equipment. Certifications include DIN EN ISO 9001:2015, UL, CSA, and Lloyd's Register approvals, which are required for North American and maritime end markets. Following the retirements of both founders (Peter Riedel in 2008 and Michael Riedel in 2010), the company transitioned into the AQ Group, a Swedish-listed industrial conglomerate, and is currently led by co-Managing Directors Wulf Heuschen and Niklas Ericsson. Revenue is not disclosed.

Name

Michael Riedel

Legal name

Michael Riedel Transformatorenbau GmbH

Website

https://riedel-trafobau.de

Company type

Private

Founded year

1972

Operating status

Operating

Headcount range

101–250 employees

Short description

Michael Riedel (AQ Riedel Trafobau GmbH) is a German manufacturer founded in 1972 that designs and produces custom transformers, chokes, DC power supplies, and UPS systems for industrial customers across renewable energy, railway, medical, semiconductor, and mechanical engineering segments.

Ownership category

akta.pro rank

Product category

Industrial Transformers and Power Components

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Electrical Equipment Manufacturing (3353), Relay and Industrial Control Manufacturing (335314), Switchgear and Switchboard Apparatus Manufacturing (335313)

SIC

Power, Distribution & Specialty Transformers (3612), Electronic Coils, Transformers & Other Inductors (3677), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

Keywords

• Transformer manufacturing
• Power supply systems
• Uninterruptible power supplies
• Inductive components
• Custom electrical engineering

Headquarters

HQ city

Ilshofen

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Custom Transformers and Inductive Components: Design, development, and production of customer-specific transformers including single-phase (0.015-500kVA), three-phase (0.05-800kVA), isolation, safety, control, and autotransformers. Available with UL, CSA, and Lloyds approvals. Revenue is project-based with custom specifications driving pricing.
2. Power Supplies and UPS Systems: Primary-switched and secondary-switched power supplies (DC 12V, 24V, 48V), DC UPS modules (up to 960W), and AC UPS systems (up to 800kW). Includes battery management systems and frequency converters.
3. Chokes and Inductors: Single and three-phase inductors including commutation, motor, filter circuit, sine filter, smoothing, AC and DC chokes with currents up to 1200A.
4. System Technology and Enclosures: Plug-and-play solutions combining transformers, power supplies, and UPS in housings. Portable and fixed enclosures for electrical engineering applications.
5. Professional Services: Custom project development from product construction to delivery, development support from concept to series production.

Go-to-market motion1 record

Distribution channels13 records

Marketing channels4 records

Core offering

Michael Riedel (AQ Riedel Trafobau GmbH) designs and manufactures custom transformers, chokes, DC power supplies, UPS modules, variable ratio ring transformers, and inductive components for industrial customers. Production is based at the German facility in Ilshofen-Eckartshausen with power ranges from 0.015kVA single-phase to 800kVA three-phase, plus system technology combining components into plug-and-play enclosures.

Product overview

Michael Riedel (AQ Riedel Trafobau GmbH) offers a comprehensive portfolio of power conversion and electrical components. The core product lines include single-phase transformers (RSTN, RSTS, REIA, URST, RLTS, RUE, REST series, 0.015-500kVA) and three-phase transformers (DRUE, DRUF, DRUL, RDST, DRET, DROP series, 0.05-800kVA), available in standard, energy-efficient (RET/DRET), or size-optimized (DROP) configurations. Supporting products include chokes/inductors (RENDr, RDMDr, RDSF series up to 1200A), DC power supplies and battery chargers (REP, RPL, GGT series up to 1.5kW, DC 12/24/48V), and UPS systems (AC up to 800kW, DC up to 960W including IPC versions with USB interface). Variable ratio ring transformers (RRSP, RDRSP, RSKH series up to 300A) provide voltage stabilization. Enclosures (RG series, Rittal steel cabinets) and accessories (inrush current limiters RESBE/RESBD, switching relays REVRL/REVVE) complete the offering. All products are available with UL/CSA or Lloyds approvals for international use.

Differentiator

Problem solved

Functional benefit

Brands

• Riedel Efficiency Technology (RET): Energy efficiency technology series featuring reduced loss transformers like DRET series
• REVRL
• REVVE
• DROP

Products and services

• Single-Phase Transformers (RSTN, RSTS, REIA, URST, RLTS, RUE, REST Series)

Segments6 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Twelve partnerships are on record, tiered core.

• Solar Nederland (Effect 5/Solarnederland.nl)coreChannel Partner/ Reseller/ DistributorDutch distributor with multiple locations across Netherlands (Duiven, Assen, Capelle aan den IJssel, Ede, Eindhoven, Hengelo). Specializes in solar and industrial electrical products, representing Riedel products in the Dutch market with focus on renewable energy and industrial applications.
• Elim SP LtdcoreChannel Partner/ Reseller/ DistributorRussian sales representative with offices in St. Petersburg and Moscow. Represents Riedel products in the Russian market for industrial applications.
• SPS electronics CZ s.r.ocoreChannel Partner/ Reseller/ DistributorCzech Republic-based sales representative located in Otvice, representing Riedel products in the Czech electronics market.
• usp Sales Management GmbHcoreChannel Partner/ Reseller/ DistributorAustrian sales representative based in Feldkirchen near Salzburg. Represents Riedel products in the Austrian industrial market.
• ROFAG Elektrotechnik AGcoreChannel Partner/ Reseller/ DistributorSwiss distributor based in Waldkirch, St. Gallen. Distributes Riedel electrical components in the Swiss market.
• ELAND S.L.coreChannel Partner/ Reseller/ DistributorSpanish sales representative based in San Sebastian (Donostia). Represents Riedel products in the Spanish market.
• Steinhaus IndustrievertretungcoreChannel Partner/ Reseller/ DistributorGerman national sales representative based in Marne (North Sea coast region). Regional industrial representation covering northern Germany.
• StapfcoreChannel Partner/ Reseller/ DistributorGerman national sales representative based in Frankfurt am Main. Regional coverage for the Frankfurt metropolitan and surrounding areas.
• Cay-AndrecoreChannel Partner/ Reseller/ DistributorGerman national sales representative based in Straubenhardt (Baden-Württemberg region). Regional representation for southwestern Germany.
• RauhcoreChannel Partner/ Reseller/ DistributorGerman national sales representative based in Wolnzach (Bavaria). Regional coverage for the Bavaria region.
• LahmecoreChannel Partner/ Reseller/ DistributorGerman national sales representative based in Düsseldorf. Regional coverage for the Rhine-Ruhr metropolitan area.
• SteikertcoreChannel Partner/ Reseller/ DistributorGerman national sales representative based in Kyffhäuserland (Thuringia). Regional coverage for central/eastern Germany.

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• ABB: Global leader in power and distribution transformers with broad grid, industrial, and rail portfolios. Competes with Riedel in distribution transformers, dry-type transformers, and frequency-converter-adjacent equipment, but serves customers at vastly larger volume and project scale.
• Vertiv Holdings: Global UPS and critical-power infrastructure provider with product families (Liebert, PowerWave) that overlap directly with Riedel's AC and DC UPS offerings. Competes most directly on AC UPS up to 800 kW in industrial and data-center-adjacent applications.
• Siemens: Operates a major transformers and railway electrification business alongside broader industrial automation. Riedel competes most directly in railway 16 2/3 Hz systems and industrial drive transformers where Siemens sets customer reference standards.
• Schneider Electric: Provides distribution transformers, UPS systems, and industrial power solutions through its Energy Management business. Overlaps with Riedel in UPS (AC up to 800 kW) and industrial control-panel power supplies.
• TDK Corporation (TDK-Lambda): Manufactures transformers, chokes, and industrial AC-DC/DC-DC power supplies at global scale. Riedel's DC power supply and inductor lines compete in the same industrial PSU and EMC component space.
• Eaton: Broad power management manufacturer producing transformers, UPS, and industrial control products. Direct overlap in UPS systems, power supplies, and industrial enclosures where Riedel sells custom solutions.

Direct peers

• Block Transformatoren-Elektronik GmbH: German specialty manufacturer of transformers, chokes, power supplies, and UPS systems, positioned squarely in the same custom/small-batch transformer niche serving European industrial OEMs. Direct product overlap across single/three-phase transformers, reactors, and DC power supplies makes it the closest peer to Riedel.
• Hammond Manufacturing: North-American-headquartered manufacturer of custom transformers, reactors, and electrical enclosures. Closely aligned with Riedel's mix of custom magnetics plus Rittal-style enclosures sold to industrial OEMs.
• Schaffner Group: Swiss specialist in EMC filters, chokes, and power quality components. Directly comparable product portfolio in line/motor chokes, sine filters, and harmonic filters used in drive technology — one of Riedel's named verticals.
• Staco Energy Products: Specialty manufacturer of UPS systems, voltage regulators, and variable transformers — directly comparable to Riedel's UPS and ring-stell-transformer product lines. Serves similar industrial and rail signaling customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

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Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

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