What Kohsel does

Kohsel A/S is a privately held Danish designer and manufacturer of custom inductive components — transformers, chokes, and filters — for industrial OEM customers worldwide. Founded in 1969 in Skanderborg, Denmark, by Poul-Erik Kohsel and Hanne Kohsel, the company has grown from a four-employee basement operation to a stated 400-600+ employee organization with wholly-owned production facilities in Skanderborg (Denmark), Liepāja (Latvia, SIA Kohsel), and Banpong/Ratchaburi (Thailand, Kohsel (Thailand) Co., Ltd.). Products are engineered-to-order against customer specifications across verticals including wind energy, solar inverters, drive technology/AC drives, E-mobility charging, Power-to-X converters, airport ground power stations, medical devices, LED lighting, refrigerated reefers, vibratory feeders, and solenoids. Core manufacturing capabilities include foil winding, rectangular wire winding, helical (edge) winding, vacuum potting, varnish impregnation, and encapsulation, supported by 3D magnetic simulation in the design phase.

The business model is direct B2B sales of custom-engineered components to enterprise OEM customers. Revenue is generated through hardware sales priced by quote, with pricing determined by customer specifications, Estimated Annual Usage (EAU), Minimum Order Quantities (MOQ), and prevailing tariffs/exchange/commodity inputs; multi-year contracts are typical. Order lines below DKK 5,000 carry a DKK 500 setup charge per the Terms and Conditions. Sales is geographically organized with Regional Sales Managers covering Denmark & Germany, Sweden, and Finland, and global demand is generated through direct sales plus participation in industry trade shows (PCIM Europe, SPS, Wind Energy Hamburg, EOT, Evertiq EXPO). Marketing is content-led: a Learn section with case studies and technical articles, a 4-5 newsletters per year, the KOHSEL TALK webinar series, Vimeo manufacturing videos, and a LinkedIn presence. The company holds ISO 9001, ISO 14001, ISO 14064-1 (GHG), and ISO 45001 certifications, was the first transformer manufacturer worldwide to join APQP4Wind (2020), and is UL-recognized for transformers 16VA-15kVA.

Name

Kohsel

Legal name

Kohsel A/S

Website

https://kohsel.dk

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Kohsel A/S is a Denmark-based, family-owned designer and manufacturer of custom transformers, chokes, and filters serving industrial OEM customers in wind, solar, AC drives, E-mobility, Power-to-X, medical, and lighting applications, with production sites in Denmark, Latvia, and Thailand.

Ownership category

akta.pro rank

Product category

Power Electronic Components / Inductive Components Manufacturing

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Electrical Equipment Manufacturing (33531)

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)

akta.pro secondary industry

Power Quality & Conditioning (PFC units, active filters, voltage regulators, surge protection) (IMAGADAG)

Keywords

• Custom inductive components
• Power transformers manufacturing
• Industrial chokes and filters
• Electromagnetic components OEM
• Winding technology manufacturing

Headquarters

HQ city

Skanderborg

HQ country

Denmark

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Customized transformers, chokes, and filters: Kohsel designs and manufactures custom inductive components (transformers, chokes, filters) for industrial applications. Products are sold as custom-engineered components to OEM customers across multiple industries. Revenue is generated through product sales, with pricing based on specifications, volumes (EAU), and MOQ requirements.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels7 records

Core offering

Kohsel designs and manufactures customized inductive components (transformers, chokes, and filters) for industrial OEM customers across multiple verticals including wind energy, solar inverters, AC drives, e-mobility, medical technology, airport power systems, lighting, reefers, and vibratory feeders. The company produces both 3-phase and single-phase transformers and chokes using foil winding, rectangular wire winding, and helical winding techniques, along with vacuum potting, encapsulation, and varnish impregnation.

Product overview

Kohsel is a Scandinavian supplier of customized inductive solutions (transformers, chokes, and filters) for customers worldwide. The company operates a single unified product line centered on inductive components, with specialized offerings across industry verticals including wind technology (grid chokes, auxiliary transformers), solar inverters (LCL filter chokes), power-to-X converters (liquid cooled grid reactors), airport power systems, e-mobility (DC link chokes, LCL filters, PFC chokes), medical devices (hearing aid charging coils, dialysis measurement coils), solenoids, LED lighting drivers, refrigerated reefers, vibratory feeders, and general AC drive technology. Core manufacturing capabilities include foil winding, rectangular wire winding, helical winding, potting, encapsulation, and varnish impregnation processes. The company also provides ferrite-based components (ETD, PQ, RM cores) as part of the product portfolio.

Differentiator

Problem solved

Functional benefit

Products and services

• Transformers Customized transformers including EI transformers for PCB and enclosure mounting, UI transformers, current-measurement transformers, auxiliary transformers, flyback transformers, and transformers for LLC resonant converters, sold to OEM customers for power conversion applications.
• Chokes Inductive chokes including 3-phase AC chokes, common-mode chokes, RFI chokes, PFC chokes, motor chokes, DC link chokes, and interference suppression coils for various power conversion applications.
• Filters EMI and harmonic filters including line reactors, harmonic filters, dV/dt filters, sinus filters, and LCL filters designed to reduce harmonics and protect electrical equipment.
• Ferrite Chokes and Transformers High-frequency ferrite-based components using cores such as ETD, PQ, RM, and UI for power conversion applications including LED drivers and resonant converters.
• Wind Technology Solutions Grid chokes for wind turbine converters (both onshore and offshore), auxiliary transformers for installations inside wind turbines (e.g., 120VA auxiliary power supply transformers), LCL filter chokes for ultra-low harmonic inverters, and common mode reactors designed for wind energy applications.
• Solar Inverter Solutions LCL filter chokes for ultra-low harmonic solar inverters with light and compact designs capable of reliable operation in extreme weather conditions including underwater and high-temperature environments.
• Drive Technology Solutions Chokes and inductive components for AC drives used in compressors, HVAC systems, and pumps, including motor chokes, line reactors, harmonic filters, dV/dt filters, sinus filters, DC link chokes, and LCL filters.
• E-Mobility and Charging Solutions DC link chokes for EV-charging modules that mitigate harmonic impact from converters and increase lifespan of inverter bridges; LCL filters for EV-charging modules that reduce total harmonic distortion (THDi); PFC chokes that improve power factor and reduce component size and cost.
• Medical Device Coils Measuring coils for dialysis machines and ultrasonic nebulizers, and charging coils for hearing aid chargers supplied to medical technology partners.
• Lighting Solutions LED transformers for LED drivers that regulate power, rectify AC to DC, and protect LEDs from voltage or current fluctuations; EMC chokes and common mode chokes used in LED drivers and DC/DC converters for stage lighting and runway light systems; PFC chokes; input chokes; and half bridge transformers.
• Airport Power System Components Transformers and chokes for fixed or mobile, battery-powered or diesel-driven airport power systems used for aircraft engine starting and maintenance.
• Power-to-X Converter Components Liquid cooled grid reactors ensuring alternating current exhibits sinusoidal waveform; common mode reactors with nanocrystalline cores providing high attenuation over wide frequency range for extreme broadband attenuation in power-to-X converter applications.
• Solenoid Valves and Coils Electromagnetic solenoid coils for valve control of liquids and gases, used in gas stoves, refrigerated counters, and excavators.
• Reefer Transformers and Chokes Robust and maintenance-free transformers and long-life chokes for refrigerated reefer containers, including DC chokes, auxiliary transformers, common mode chokes, line reactors, harmonic filters, motor chokes, dV/dt filters, and sinus filters, designed to withstand vibrations, shock, and harsh conditions at sea.
• AC Magnets for Vibratory Feeders Corrosion-protected AC magnets for vibratory feeders used in multi-head weighing machines, enabling fast and precise weighing of difficult products at a low cost per portion.

Quantifiable outcome

• 4% cost reduction on 40,000 DC link choke components (28,000 EUR annual savings)
• +9 more outcomes

Named customers1 record

Segments11 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Four partnerships are on record, tiered minor and core.

• Danish Wind Energy AssociationminorGTM or Marketing Partner · 1 January 2024Kohsel participated in Wind Energy Hamburg 2024 together with the Danish Wind Energy Association. The association encourages its members to attend the world's biggest wind business platform.
• APQP4WindcoreStrategic or Co-development Partner · 1 January 2020Kohsel became the first transformer manufacturer in the world to become a member of APQP4Wind in 2020. APQP4Wind is a non-profit organisation founded by world-leading wind turbine manufacturers and suppliers. The organization focuses on continuous quality improvement to keep pace with decreasing levelized cost of energy in the wind industry. Kohsel has completed APQP4Wind training and incorporated the APQP4Wind manual into its ISO 9001 Quality system.
• Aalborg University (AAU)minorStrategic or Co-development PartnerKohsel collaborated with Professor Stig Munk-Nielsen from the Department of Energy Technology at Aalborg University for a KOHSEL TALK webinar on 'The next generation of power electronics within renewable energy.' The discussion covered the latest devices used in power electronics and how they can increase wind turbine energy output. Hosted by Morten Kohsel.
• DSV (Danish transport and logistics company)minorStrategic or Co-development PartnerAnders Oldenborg Kristensen, Director Product Sea Freight at DSV Denmark, was featured as an expert speaker in a KOHSEL TALK webinar on 'From Asia to Europe – challenges and opportunities in the global supply chain.' Topics covered sea freight rate evolution, optimal supply chain setup, and sustainable transportation developments.

Scale indicators16 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Talema Group: Manufacturer of transformers, chokes, and current sensors with production in India and Europe. Comparable as a custom inductive component supplier serving industrial and renewable energy OEMs.
• REO (REO ELEKTRONIK AG): German manufacturer of chokes, filters, transformers, and power quality components for drives, renewables, and railway. Comparable as a European specialist in inductive components and power quality.
• Block Transformatoren-Elektronik: German manufacturer of transformers, power supplies, EMI filters, and reactors for industrial automation, drives, and renewable energy. Closely comparable mid-sized European competitor with overlapping product lines and customer segments.
• Noratel: Norwegian-headquartered global manufacturer of custom transformers, inductors, and chokes serving industrial OEMs across renewables, marine, drives, and medical. Directly comparable in product portfolio, custom-engineering model, and European heritage.
• Hammond Manufacturing: Canadian manufacturer of custom transformers, chokes, and magnetic components with a global footprint. Directly comparable as a custom inductive component supplier to industrial OEMs, with overlapping verticals in drives, renewable energy, and industrial automation.
• Triad Magnetics: US-based manufacturer of custom transformers, inductors, and chokes for industrial and medical applications. Directly comparable as a custom magnetics supplier to OEMs with similar product breadth.
• Schaffner Group: Swiss-listed specialist in EMC/EMI filters, chokes, and power quality components. Directly comparable in the chokes and filters portion of Kohsel's portfolio, particularly in drives and renewable applications.
• Vogt AG: Swiss manufacturer of inductive components including chokes, transformers, and coils for automotive, industrial, and renewable energy. Comparable mid-sized European custom magnetics specialist.

Broad incumbents

• Würth Elektronik eiSos: Large German electronic component manufacturer offering transformers, chokes, and filters as part of a much broader passive component portfolio. Comparable product overlap but operates at far greater scale and breadth.
• TDK (EPCOS): Global Japanese electronics giant with a large magnetics portfolio (EPCOS brand) including transformers, chokes, and filters for industrial, automotive, and renewable applications. Comparable product categories but vastly larger and broader than Kohsel's custom-focused model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/kohsel-a-s

Compliance19 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries2 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 Kohsel