Ismet AG

What Ismet AG does

ISMET GmbH is a German manufacturer of low-voltage transformers, chokes (inductors), filters, and other wound inductive components, tracing its origins to 1902 and operating today with 101–250 employees across European production locations. The company develops and builds a broad portfolio spanning standard catalog products — single-phase and three-phase transformers, toroidal variable transformers, step transformers, and small DC power supplies — alongside extensive custom-engineered solutions. Custom capabilities extend to high-current transformers (output currents up to 15,000 A), high-voltage transformers (up to 36 kV), water-cooled transformers and chokes (up to 3 MVA), chokes and filters (up to 6 tonnes), cast-resin encapsulated units, coupling inductors, starting transformers, and fully integrated switch-cabinet complete solutions, with total unit weights reaching 10 tonnes. Technology differentiation rests on proprietary water-cooled heat sink designs achieving 10–30% lower losses, advanced nanocrystalline/amorphous/ferrite core materials that reduce losses by up to 65%, and adherence to DIN/VDE and UL certification standards.

The company's business model is a hybrid catalog-plus-engineering sales operation. Over 200 standard articles are held in inventory for short-delivery fulfillment, while custom solutions are quoted individually based on technical specifications. ISMET sells direct to industrial buyers across at least 16 verticals including machine construction, drive technology, energy distribution, plant engineering, automation, renewable energy, railway, mining, e-mobility, data centers, and process technology. Distribution is conducted through direct sales offices in Germany (Niederzier and VS-Schwenningen), the Czech Republic (ismet transformátory s.r.o.), Spain, and Italy, supplemented by the EPLAN Data Portal integration for engineering software users and participation in trade fairs such as SPS Nuremberg.

Since 2022, ISMET has operated as a product brand of REDUR GmbH & Co. KG, a German transformer manufacturer that is itself a subsidiary of Swiss-listed industrial conglomerate PHOENIX MECANO AG. The REDUR group expanded further in May 2024 with the asset-deal addition of TRAMAG Transformatorenfabrik GmbH & Co. KG. ISMET does not publicly disclose revenue, and operates with no AI, software, or platform components in its product offering — value creation is entirely physical-engineering-based.

Name

Ismet AG

Legal name

ISMET GmbH

Website

https://ismet.de

Company type

Private

Founded year

1902

Operating status

Operating

Headcount range

101–250 employees

Short description

ISMET GmbH is a German manufacturer (founded 1902) of low-voltage transformers, chokes, and filters, serving industrial customers across energy, machinery, automation, renewables, and rail. Operating as a product brand of REDUR within PHOENIX MECANO AG, it combines a 200+ catalog range with custom engineered inductive components up to 5 MVA.

Ownership category

akta.pro rank

Headquarters

HQ city

Villingen-schwenningen

HQ country

Germany

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Transformer and wound component sales: ISMET generates revenue through the sale of transformers, chokes, filters, and other wound components. The product portfolio includes both standard catalog items (over 200 articles in stock) and custom-engineered solutions. Products range from small transformers to large custom solutions up to 10 tonnes and 5 MVA.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

ISMET manufactures low-voltage transformers, chokes (inductors), filters, and other wound inductive components for industrial applications. The portfolio spans more than 200 standard catalog articles kept in stock and fully custom-engineered solutions up to 10 tonnes total weight, 5 MVA power, 15,000 A current, 36 kV voltage, and 150 kHz frequency. Products are engineered in Germany and built at European production locations, serving verticals such as machine construction, energy distribution, drive technology, automation, railway infrastructure, and renewable energy.

Product overview

ISMET develops and manufactures a broad portfolio of inductive electrical components — primarily transformers, chokes (inductors), and filters — spanning both standard catalog/stocked products and extensive custom-engineered solutions. Standard transformers include single-phase types (NET, KAWN/KLWN, NET-ST, KAW/KAW-G, ISTU/ISTK, IMS, SSTE) and three-phase types (DAWT, DAW, DAWN, DSST, DLWN, SSTD, RU-1/RU-2), ranging from 22 VA to 1 MVA, voltages up to 36 kV, currents up to 15,000 A, and frequencies up to 150 kHz. Custom solutions extend across high-current transformers (up to 15 kA), high-voltage transformers (up to 36 kV), water-cooled and air-cooled transformers (up to 3 MVA), chokes and filters (up to 6 t), cast-resin/encapsulated transformers (up to 50 kVA, IP67), coupling inductors (up to 36 kV), power supply transformers (up to 1.5 MVA), starting transformers (up to 630 kVA), matching transformers (up to 500 kVA), regulating transformers (up to 120 kVA), reactive power compensation chokes, air-core coils (up to 1,800 mm), test bay/lab equipment (up to 800 kVA), and fully integrated switch-cabinet complete solutions (up to 600 kVA). Since 2022, ISMET has been managed as a product brand of REDUR GmbH & Co. KG, which itself is part of the PHOENIX MECANO Group.

Differentiator

Problem solved

Functional benefit

Products and services

• NET Single-Phase Power Transformer Single-phase power transformer approved to DIN EN 61558 / VDE 0570-2-1, with terminal screw connections for safety class I, ta 40°C, 50/60 Hz, dip-impregnated. Power range: 22-3,500 VA; primary voltage: 0-400 V; secondary voltage: 24-230 V. For industrial and machine control applications.
• KAWN / KLWN Single-Phase Power Transformer Single-phase power transformer up to 16 kVA certified to DIN EN 61558 / VDE 0570-2-1 (power), -2-4 (isolation), or -2-6 (safety); UL-listed. Open version (KLWN, IP00) or housed version (KAWN-G/KLWN-G, IP23, RAL 7035 steel housing). Power: 1.6-16 kVA; primary: 230-500 V; secondary: 115-440 V. For industrial control and isolation applications.
• NET-ST Single-Phase Control Transformer Single-phase control transformer tested to DIN EN 61558 / VDE 0570-2-2; terminal screw connections; safety class I; ta 40°C; 50/60 Hz; dip-impregnated. Power: 100-3,000 VA; primary: 0-400 V; secondary: 24-230 V. For control circuits in machinery and automation.
• KAW / KAW-G Single-Phase Matching Transformer Single-phase matching transformer to DIN EN 60076 / VDE 0532; UL-listed. Open version (KAW) or housed (KAW-G, IP23, RAL 7035). Power: 20-70 kVA; primary: 230-500 V; secondary: 115-440 V. For voltage matching in industrial systems.
• DAWT / DAW / DAWN Three-Phase Transformers Three-phase transformers in three series: DAWT (matching transformer, 40-125 kVA), DAW (matching transformer, 160-1,000 kVA), and DAWN (network/isolation/safety transformer, 0.16-30 kVA). All certified to DIN EN 60076 / VDE 0532 or DIN EN 61558 / VDE 0570; UL-listed; available in open or housed versions (IP23-IP54). For three-phase industrial power distribution and matching.
• RU-1 / RU-2 Toroidal Variable Transformers Single-phase and three-phase toroidal variable (ring) transformers to DIN VDE 0552, executed as autotransformers (single winding) with rotary knob and scale for stepless voltage adjustment from zero to maximum. RU-1: 1.25 A, 230 V primary, 0-230 V secondary; RU-2: higher current ratings. For laboratory, test, and variable-voltage applications.
• SSTE / DSST / SSTD Step Transformers for Fan Control Step transformers for single-phase (SSTE, 1.5-20 A) and three-phase (DSST/SSTD, 0.8-35 A) fan control to DIN EN 61558 / VDE 0570-2-13; common primary/secondary windings (non-galvanically isolated); available in open or housed versions (IP43) with rotary switch. For fan speed and ventilation control.
• High-Current Transformers (Hochstrom-Transformatoren) Single-phase and three-phase high-current transformers with rated power up to 630 kVA and output currents up to 15 kA in protection classes up to IP54. Available with air cooling (forged or strip winding) or indirect water cooling. Example: three-phase dry-type transformer DAW, 950 kVA, 50 V secondary at 11,000 A, 2.3 t weight. For industrial furnace, electroplating, and high-current applications.
• High-Voltage Transformers (Hochspannungs-Transformatoren) Single-phase and three-phase high-voltage transformers with rated power up to 600 kVA for primary voltages up to 20 kV and secondary voltages up to 15 kV in protection classes up to IP54. Available as open-type, housed, or cast-resin versions. Example: 80 kVA three-phase dry transformer with secondary voltages of 2,560 / 4,350 / 5,230 V. For grid, industrial, and test applications.
• Water-Cooled Transformers and Chokes (Wassergekühlte Transformatoren und Drosseln) Indirect water-cooled single-phase and three-phase transformers and chokes in open construction with rated power up to 3 MVA. Example: three-phase transformer DAW, 3 MVA at 3 × 2,500 A. Energy-efficient innovative heat sinks reduce losses by 10-30% vs. conventional designs; total losses reduced by 26%, heat-sink losses reduced by 73%. For high-power industrial drive and process applications.
• Custom Chokes (Drosseln) Custom chokes up to 6 t total choke weight, air-cooled, force-ventilated, or with indirect water cooling. Applications include current limitation, DC motors, and converters. Example: single-phase choke set KDL — four individual chokes in a steel cabinet (IP20) with step switches, relays, and I/O board. For drive and converter applications.
• Custom Filters (Filter) Custom filters up to 6 t total filter weight, air-cooled, force-ventilated, or with indirect water cooling. Used for current limitation, DC motors, converters, and electrical filtering. For industrial power quality and harmonic filtering applications.
• Power Supply Transformers (Versorgungs-Transformatoren) Power supply transformers for rated power up to 1.5 MVA, including step-up transformers (e.g., 3 × 400 V to 3 × 1,000 V) and step-down transformers. Overload- and short-circuit-safe; delivered in metal housing with sliding skids; protection class IP54. For industrial power distribution systems.
• Air-Core Coils (Luftspulen) Custom air-core coils up to 1,800 mm diameter and 2 t total weight; insulation class H; dip, vacuum, or spray impregnation. Used for current limitation, magnetization systems, and as toroidal coils. For industrial and scientific applications.
• Cast Resin / Encapsulated Transformers (Vergusstransformatoren) Single-phase and three-phase encapsulated/cast-resin transformers for connection via sockets, terminals, and cables, with rated power up to 50 kVA, protection classes up to IP67, protection class II, and test voltage up to 30 kV. Fixed or portable installation. Example: type KSTF, 1 kVA with 3 m primary cable and Schuko plug, secondary double socket with hinged cover. For harsh-environment and portable applications.
• Coupling Inductors (Kopplungsinduktivität) Three-phase coupling inductors in open construction for parallel coupling at voltage levels up to 36 kV; inductance, currents, and frequencies designed to customer specifications. Example: type KI coupling inductor, 120 mH for parallel coupling. For grid and parallel-coupling applications.
• Test Bay and Laboratory Equipment (Prüffeld- und Laborausstattung) Custom test bay and laboratory equipment with rated power up to 800 kVA; manual, fully automatic, or PC-controlled operation. Example: three-phase regulating set type DR, 1 kVA with motor adjustment, voltage setting via pushbuttons, inrush current limiting, voltage and current displays, and 19-inch rack frame. For R&D and electrical testing laboratories.
• Starting Transformers (Anlass-Transformatoren) Starting transformers up to 630 kVA rated power and voltages up to 10 kV, with autotransformer winding; available as open, steel-housed, or cast-resin versions (protection up to IP54). Connections via terminals, copper rails, or insulators. Individual acceptance testing by classification societies (DNV GL, LRS, etc.) available. Example: type DHA three-phase starting transformer, 1 MVA with autotransformer winding. For heavy-duty motor starting, maritime, and mining applications.
• Matching Transformers (Anpass-Transformatoren) Single-phase and three-phase matching transformers with autotransformer or isolated winding, rated power up to 500 kVA, housed up to IP54. Factory-installed options include fuses, main switches, sockets, temperature monitoring, and other accessories. Example: type DAWT-G three-phase matching transformer, 50 kVA, autotransformer winding, custom paint matching the machine. For voltage matching in industrial machinery.
• Regulating Transformers (Regel-Transformatoren) Regulating transformers with rated power up to 120 kVA; single-phase or three-phase; toroidal or column design; autotransformer or isolated winding; hand-operated or motor-driven (AC or DC drive). Up to IP54 housed. Example: type DRU-M three-phase toroidal regulating transformer, 25 A, 0-400 V, 27-second positioning time, delivered with stepper motor and 10 V interface control unit. For laboratory, test, and adjustable-voltage applications.
• Reactive Power Compensation Chokes (Blindleistungskompensationsdrosseln) Custom chokes up to 6 t total weight, air-cooled, force-ventilated, or indirect water-cooled, for reactive power compensation. Example: single-phase iron-core choke, 16.7 Hz, 15 kV, 700 kVAr, with indirect water cooling for railway power compensation. For utility grid and railway power-factor correction.
• Energy-Efficient Transformers and Chokes (Energieeffiziente Transformatoren und Drosseln) Loss-reduced transformers and chokes using nanocrystalline, amorphous, or ferrite core materials. Losses can be reduced by up to 65%, with payback on higher acquisition costs in approx. 1.8 years at current energy prices. Used in data centres and building technology applications requiring high energy efficiency.
• Complete Switch-Cabinet Solutions (Komplettlösungen) Custom turnkey switch-cabinet systems integrating transformers, chokes, filters, switching, and control electronics for R&D and functional testing of motors, converters, cables, and other electrotechnical components up to 600 kVA. Example: complete motor test system for an electric motor manufacturer, 250 kVA variable input voltage and frequency, IP20, delivered fully assembled in a switch cabinet. For R&D labs and industrial test facilities.

Quantifiable outcome

• Losses reduced by 10-30% compared to conventional heat sinks in water-cooled solutions
• +2 more outcomes

Segments16 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature5 records

Partnerships

Three partnerships are on record, tiered minor and core.

• TRAMAG Transformatorenfabrik GmbH & Co. KGminorStrategic or Co-development Partner · 2 May 2024TRAMAG Transformatorenfabrik GmbH & Co. KG became a member of the REDUR group on May 2, 2024 through an asset deal. TRAMAG is another transformer manufacturer that now operates under the REDUR umbrella alongside ISMET.
• REDUR GmbH & Co. KGcoreStrategic or Co-development Partner · 1 January 2022Since 2022, ISMET is managed as a product brand of REDUR GmbH & Co. KG. REDUR is a German transformer and inductive component manufacturer that acquired ISMET as part of its brand portfolio. The REDUR headquarters is located at Neue Str. 20A, D-52382 Niederzier.
• PHOENIX MECANO AGcoreStrategic or Co-development PartnerPHOENIX MECANO AG is a globally operative Swiss technology company. ISMET is part of the PHOENIX MECANO Group alongside other companies focused on professional production of niche products. The group specializes in development and production of industrial components used in machine construction, measuring and control technology, medical technology, aerospace, energy sector, and residential/healthcare facilities.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• TRAMAG Transformatorenfabrik GmbH & Co. KG: German manufacturer of transformers, chokes, and inductive components now operating under the REDUR group alongside ISMET. Highly comparable in product range (transformers, chokes, filters) and customer verticals (machine construction, drive technology, automation), making it the closest like-for-like peer.
• REDUR GmbH & Co. KG: Parent brand of ISMET and German manufacturer of transformers and inductive components. Directly comparable across product range, vertical exposure, and engineering capabilities — ISMET is essentially a product line within REDUR's portfolio.
• Block Transformatoren-Elektronik GmbH: German manufacturer of transformers, chokes, filters, and power supplies for industrial and drive applications. Overlaps with ISMET on standard catalog transformers, chokes, and custom-engineered inductive components, serving similar German and European industrial customers.
• Hammond Manufacturing Company Limited: Manufacturer of standard and custom transformers, chokes, and enclosures for industrial and electronics applications. Comparable to ISMET in its mix of stocked catalog transformers and custom-engineered inductive components serving industrial OEMs.
• Riedel Trafo: German specialty transformer manufacturer focused on toroidal and small custom transformers for industrial and electronics applications. Closely comparable to ISMET on low-voltage transformer engineering, custom winding, and German mid-market industrial customers.

Broad incumbents

• ABB Ltd: Global electrical-equipment incumbent with a broad portfolio of transformers, drives, and power-quality products. Comparable to ISMET on transformer and choke product categories; competes in the upper end of ISMET's power range but at far greater scale and geographic reach.
• Siemens Energy / Siemens Smart Infrastructure: Major incumbent producing distribution transformers, power-quality equipment, and grid components alongside a much broader portfolio. Overlaps with ISMET across transformer and reactor product categories and competes in large industrial and grid tenders in Europe.
• Schneider Electric SE: Global electrical equipment and industrial automation group with transformer-adjacent offerings including variable-speed drives, reactors, and power-quality solutions. Comparable as a broad-based incumbent serving the same industrial automation and energy distribution customers as ISMET.
• TDK Corporation (EPCOS / TDK-Lambda): Global electronic-components group with significant presence in inductors, chokes, and power magnetics. Comparable to ISMET on the chokes, filters, and wound-components side of the portfolio, though TDK's scale and consumer/auto focus make it a broad incumbent rather than a direct industrial-only competitor.

Emerging players

• Würth Elektronik eiSos GmbH & Co. KG: Manufacturer of electronic and electromechanical components including transformers, inductors, and filters for industrial and electronics applications. Comparable to ISMET on the chokes, filters, and wound-components categories, though typically focused on smaller-form-factor power magnetics than ISMET's multi-megawatt units.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/ismet-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries3 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 →

Frequently asked questions about Ismet AG