Flux

What Flux does

Flux A/S is a privately held Danish designer and manufacturer of custom electromagnetic components — transformers, inductors, chokes, magnetorquer rods, and EMI filters — for power conversion and control in demanding applications. Founded in 1995 and headquartered in Asnæs, Denmark, with a wholly owned manufacturing subsidiary, Flux International Limited, in Bangkok, Thailand (~300 employees), Flux serves five vertical markets: Defence and Space, Commercial Space, Renewable Energy, Automotive/eMobility, and Industrial. Its space-grade magnetic components are designed into spacecraft power conditioning systems, electrical propulsion, attitude control, and motor drives for customers including the European Space Agency (ESA), Airbus, Terma, Micross, Space Inventor, Orbex, nanoTRONIC, and Texas Instruments; commercial and renewable-energy customers include global wind turbine producers and EV charging and powertrain OEMs.

The company's technology stack centres on in-house electromagnetic and mechanical design, ESA-qualified manufacturing processes, and rigorous testing under multiple certifications (ESA Technology Flow Qualification TFQ 364A, ISO 9001, AS9100, ESCC, UL1446, AEC-Q200, IPC-A-610 Class 3, MIL-STD-981, MIL-PRF-27). Flux authored the ESA Detail Specification ESCC3201/013 for custom inductors and transformers — the standard on which its ESA qualification rests — and pioneered planar magnetics for electrical propulsion in collaboration with ESA beginning in 2005. Its proprietary HiRel (High Reliability) production strategy combines space-grade design discipline with industrial-scale automation at the Thai facility, enabling space-quality components at commercial-space price points. Additional capabilities include in-house SLA resin 3D printing for rapid prototyping and 15-year per-component traceability documentation.

Flux operates a direct, engineering-led sales model: experienced design engineers engage customer engineering teams across three cooperation scenarios (design verification of customer drawings, design assistance, or full specification-to-production), supported by content marketing, a Space Product Catalogue, and presence at PCIM Europe and Space Tech Expo Europe. Revenue is generated through one-time project-based contracts for custom design and production, with pricing undisclosed and determined per project scope. Customers include major space agencies (ESA, NASA via Gateway), aerospace primes (Airbus), and global wind turbine OEMs, creating a diversified but programme-lumpy revenue base concentrated in the higher-margin space segment.

Name

Flux

Legal name

Flux A/S

Website

https://flux.dk

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

101–250 employees

Short description

Flux A/S is a Danish designer and manufacturer of custom electromagnetic components — transformers, inductors, chokes, magnetorquer rods, and EMI filters — for ESA-qualified space, defence, renewable energy, automotive, and industrial customers, with production in Denmark and Thailand.

Ownership category

akta.pro rank

Product category

Custom Magnetic Components Manufacturing

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Power, Distribution & Specialty Transformers (3612), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Transformers & Magnetics (Power/Signal) (HDAHANAD)

akta.pro secondary industry

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

Keywords

• Custom magnetic components
• Electromagnetic transformer manufacturing
• Space-grade inductors
• ESA qualified magnetics
• Power electronics components

Headquarters

HQ city

Asnæs

HQ country

Denmark

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Magnetic Component Manufacturing: Flux designs, develops, and manufactures bespoke electromagnetic components (transformers, inductors, chokes) to meet specific customer requirements across defence, space, automotive, industrial, and renewable energy sectors. Revenue is generated through one-time project-based contracts with custom design and production fees. Components are sold directly to OEMs, subsystem manufacturers, and space agencies. The company serves both high-volume markets (automotive, industrial) and low-volume high-complexity markets (space, defence).

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Flux designs, develops, and manufactures custom electromagnetic components (transformers, inductors, chokes, magnetorquer rods, and EMI filters) for mission-critical applications in defence, space, automotive, renewable energy, and industrial sectors. The company provides bespoke solutions from specification through prototyping, testing, and production, supported by ESA, AS9100, and AEC-Q200 certifications.

Product overview

Flux is a manufacturer of next-level magnetic components for power solutions, specializing in custom-designed transformers, inductors, and chokes. The company operates across five market segments: Defence and Space, Commercial Space, Renewable Energy, Automotive, and Industrial. Their product portfolio centers on three core magnetic components (Transformers, Inductors, and Chokes) complemented by specialized products including the Magnetorquer Rod for satellite attitude control and EMI filters for spacecraft electronics. Flux also offers a Space Product Catalogue of standardized components for commercial space applications and the HiRel (High Reliability) line combining space-grade quality with scalable manufacturing. The company serves highly demanding industries requiring components that withstand extreme environmental conditions.

Differentiator

Problem solved

Functional benefit

Brands

• HiRel: High Reliability concept - a production strategy combining true Space design and reliability with more flexible industrial scaling for commercial space applications.

Products and services

• Transformers

Quantifiable outcome

• 0% fail-rate for space components
• +4 more outcomes

Named customers13 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• European Space Agency (ESA)coreStrategic or Co-development Partner · 1 January 2005Long-standing collaboration beginning in 2005 to develop planar magnetics for electrical propulsion. ESA granted Flux its Technology Flow Qualification in 2019. Flux authored ESA Detail Specification ESCC3201/013 which was adopted by ESA. The partnership has produced components for numerous ESA missions including HERA, CO2M, Harmony, and the lunar Gateway.
• TermacoreStrategic or Co-development Partner · 1 January 199920+ year collaboration (since 1999/Ørsted Satellite) between the two Danish companies. Flux supplies magnetic components for Terma's Remote Terminal Units (RTUs) and Power Conditioning Distribution Units (PCDU) used across multiple ESA missions including HERA (planetary defence), CO2M (greenhouse gas monitoring), and Harmony (Earth observation). The collaboration combines Terma's strengths in satellite systems design with Flux's production and qualification expertise.
• Space InventorcoreStrategic or Co-development PartnerFlux collaborates with Space Inventor on the development and production of magnetorquer rods with precise windings and coating for LEO satellites. Flux is responsible for winding and coating while Space Inventor handles the overall magnetorquer design and integration. Also collaborated on the Danish Máni lunar mapping mission where Space Inventor designed and constructed the satellite.
• MicrosscoreStrategic or Co-development PartnerStrategic partnership for the OneWeb satellite constellation project where Micross developed DC/DC converters for power RF circuitry. Flux manufactured, tested, and screened all magnetic components. The partnership used a mix of COTS and custom magnetic designs to meet cost targets, producing 2,000 converters with more than 9,000 magnetic components. Flux's HiRel production in Thailand was used to meet commercial space cost requirements.
• OrbexcoreStrategic or Co-development PartnerFlux partnered with Orbex to develop a high-performance solenoid valve coil for their next-generation launch vehicle propulsion system. Orbex sought a customized component that could meet critical flow rates, pressures, and speed requirements that standard solenoid valves could not achieve. Flux's ESA qualification and forward-thinking approach to innovation were key factors in the partnership.
• nanoTRONICcoreStrategic or Co-development PartnerCollaboration for the Gateway lunar mission where nanoTRONIC developed pump motor controllers for thermal fluid centrifugal pumps. Flux supplied the complete EMI filter structure containing multiple inductors for the pump controller operating more than 400,000 km from Earth. Flux dived into detailed engineering to find the right cores and wires, ensuring proper thermal behaviour.
• Texas InstrumentscoreTechnology or IntegrationStrategic collaboration where Flux provides off-the-shelf catalogue space-grade transformers designed to integrate with TI's TPS7H5020/5021-SEP/-SP and TPS7H5030/31-SEP/-SP PWM controller families. Combined with TI reference kits (TPS7H502FLYEVM, PMP23546, PMP23598, etc.), this provides satellite designers with a validated framework between catalogue controllers and transformers, reducing design iteration time and risks.
• Protec GmbHminorChannel Partner/ Reseller/ DistributorGerman distributor representing approximately 9-10 manufacturers in the space industry. Flux shared a booth with Protec GmbH at Space Tech Expo Europe in Bremen, using the distributor's booth presence to engage with existing and potential customers.

Scale indicators12 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Würth Elektronik: German manufacturer of electronic components with a substantial magnetics portfolio of power inductors, transformers, and chokes for automotive, industrial, and renewable applications. Comparable transformer/inductor offerings to Flux's non-space segments.
• Murata Manufacturing: Leading Japanese manufacturer of electronic components including a major magnetics portfolio of inductors and transformers for automotive, communications, and industrial markets. Overlaps with Flux in automotive/industrial magnetics but with broader catalog depth.
• Vishay Intertechnology: Large US-based manufacturer of discrete semiconductors and passive components including a broad magnetics catalog of inductors and transformers for automotive, industrial, military, and aerospace markets. Comparable product family to Flux at significantly larger scale.
• TDK Corporation: Global electronics giant with a broad magnetics portfolio covering transformers, inductors, and chokes across consumer, automotive, industrial, and telecom markets. Comparable products but at much greater scale and across a wider portfolio than Flux's custom-engineering focus.

Direct peers

• Sumida Corporation: Japanese global manufacturer of custom inductors, transformers, and power magnetics with strong automotive, industrial, and renewable energy exposure. Closely comparable to Flux's business model of bespoke magnetic components for demanding end markets.
• Premo Group: Spanish manufacturer of custom magnetics components including transformers, inductors, and chokes for automotive, industrial, and renewable energy applications. Comparable custom magnetics focus with similar industrial and eMobility verticals.
• Coilcraft: US-based manufacturer of custom and standard inductors, transformers, and chokes serving communications, computing, automotive, and industrial markets. Directly comparable to Flux in offering custom magnetic components with similar product categories and application breadth.
• Payton Planar Magnetics: Manufacturer specializing in planar transformers and inductors for high-frequency power conversion including aerospace, defense, and EV applications. Highly comparable to Flux's planar magnetics heritage for space electrical propulsion.
• Standex Electronics (Standex International): US-based custom magnetics manufacturer serving aerospace, defense, automotive, medical, and industrial markets with custom transformers, inductors, and sensors. Comparable niche custom-magnetics positioning similar to Flux.
• API Delevan (Regal Rexnord): US manufacturer of precision inductors, transformers, and chokes serving aerospace, defense, medical, and industrial markets. Comparable in custom magnetics focus and in the range of demanding end-market certifications Flux pursues.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/flux.as
• LinkedInlinkedin.com/company/flux-a-s

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Subsidiaries1 record

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 Flux