Trafox

What Trafox does

Trafox (legal entity Muuntosähkö Oy) is a Finnish electrical equipment manufacturer founded in 1947, specializing in custom-engineered transformers, chokes/reactors, filters, and the Trafox Superintend® line of insulation and residual current monitoring devices. The company produces a wide range of products from small wound components and control transformers up to 2MVA power transformers, with differentiated technical features such as very low inrush current medical isolation transformers (under 3.5x In), pre-magnetization systems that reduce starting inrush, and water-cooled reactors rated up to 8,000A for renewable energy and marine applications. The Trafox Superintend® monitoring portfolio supports both AC and DC networks, including PV applications (up to 1,500 VDC) and EV charging stations (up to 1,250 VDC), with Modbus/TCP, Modbus RTU, and CAN bus interfaces.

The company operates four production facilities across three countries totaling 23,000 m2 (Helsinki and Joensuu in Finland, Viljandi in Estonia, and Suzhou in China), supported by subsidiaries Trafox Eesti Oü and Suzhou Trafox Electronics Co. Ltd. It serves six primary use-case segments: heavy industry, general industry (frequency converters and automation), renewable energy, healthcare, construction, and marine. Go-to-market is enterprise field sales with dedicated product-line sales managers, complemented by an extensive global representative network spanning Europe, the Americas, and Asia, plus an online store at the SMB level. Revenue is generated through quote-based hardware sales of custom-engineered products under multi-year contracts; pricing is not publicly disclosed.

The company holds multiple international certifications (Lloyd's Register type approval, SGS Fimko, UL, ISO 9001:2015) that carry weight in regulated marine and healthcare end-markets. Leadership is concentrated under Managing Director Jyri Taskinen, with a lean named executive team of five individuals. The company is privately held with no disclosed external investors, funding rounds, or M&A activity, indicating growth is being funded organically through operational cash flow and reinvestment, as evidenced by the 2024 Joensuu factory expansion.

Name

Trafox

Legal name

Muuntosähkö Oy

Website

https://trafox.fi

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

251–500 employees

Short description

Trafox (Muuntosähkö Oy) is a Finnish custom electrical equipment manufacturer founded in 1947, producing transformers, chokes, filters, and Trafox Superintend insulation monitoring devices for industrial, healthcare, marine, renewable energy, and EV charging customers across Europe, Asia, and the United States.

Ownership category

akta.pro rank

Headquarters

HQ city

Helsinki

HQ country

Finland

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Transformer Sales: Sale of custom and standard transformers including power transformers, isolation transformers, medical isolation transformers, control transformers, and toroidal transformers. Both standard product lines and custom-engineered solutions for specific applications.
2. Choke/Reactor Sales: Sale of iron core, ferrite core, and air core reactors including detuned reactors, line reactors, water cooled reactors, and frequency converter reactors. Customizable features, dimensions, and mounting options.
3. Filter Sales: DU/dt and Sine filters for frequency converter applications. Filters extend motor service life and ensure reliable operation in industrial applications.
4. Monitoring Device Sales: Trafox Superintend® monitoring devices including IMD insulation monitoring systems and RCM residual current monitoring systems. Includes remote modules and display units for comprehensive system monitoring.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Trafox (Muuntosähkö Oy) develops, manufactures, and customizes transformers, chokes/reactors, filters, and Trafox Superintend® insulation and residual current monitoring devices. Products range from wound small components and control transformers up to 2 MVA power transformers, detuned and water-cooled reactors, dU/dt and sine filters, and certified IMD/RCM monitoring systems for industrial, healthcare, marine, renewable energy, construction, and heavy industry customers. Manufacturing is carried out in Finland, Estonia, and China with engineering-driven customization for application-specific electrical, safety, and certification requirements.

Differentiator

Problem solved

Functional benefit

Brands

• Trafox Superintend®: Innovative fault current and insulation level monitoring devices for industrial, renewable energy, marine, medical, construction and heavy industrial applications
• Chenahoya

Products and services

• Transformers (Muuntajat) Range of standard and custom transformers including control, isolation, medical isolation, and toroidal types for industrial, healthcare, and automation customers.
• Power Transformers (Tehomuuntajat) Single- and three-phase dry-type power transformers and interference-suppression transformers ranging from 6.3 kVA to 2 MVA for energy, marine, and industrial applications.
• Filters (Suodattimet) dU/dt filters and sine filters for frequency converter applications, designed to extend motor service life and ensure reliable operation in industrial installations with cable lengths up to 100-300 m.
• Reactors / Chokes (Kuristimet) Iron-core, ferrite-core, and air-core reactors including detuned reactors, line reactors, water-cooled reactors, and frequency converter reactors, customizable in features, dimensions, and mounting for industrial and renewable energy applications.
• Water-Cooled Reactors Water-cooled single- and three-phase reactors manufactured up to 8000 A using low-loss FE strips, ferrites, or amorphous core materials, designed for renewable energy, marine, and heavy industry applications.
• Medical Isolation Transformers Medical-grade isolation transformers with very low inrush current (typically under 3.5x In), low leakage currents, low standby losses, and long-lifetime design with high temperature class insulations for hospital and clinical applications. SGS Fimko FI mark certified.
• Trafox Superintend® IM-07DCCT Insulation Monitoring Device Insulation monitoring device for voltages up to 1250 VDC with system voltage monitoring, short-circuit proof and galvanically isolated outputs, CAN bus interface, and disconnection functionality for HV connectors in EV and DC charging applications.
• Trafox Superintend® IM-06DCCT Insulation Monitoring Device Insulation monitoring device for DC charging stations featuring potential-free alarm and pre-alarm contacts with Modbus RTU interface.
• RD-12.RCCB Remote Alarm Indicator Panel Remote alarm indicator panel monitoring up to 12 RCCBs remotely with LED status indication, LCD display, configurable identification texts, and alarm sound functionality.
• UL Certified Insulation Monitoring Devices IM-04DCCT.UL and IM-05DCCT.UL UL-certified insulation monitoring devices for EV DC charging stations and DC networks with nominal system voltage 0-1000 VDC and Modbus RTU interface.
• IM-04.INDM Marine Insulation Monitoring System Lloyd's Register type approved insulation monitoring system for marine applications, designed for demanding marine environments and supporting frequency converter applications.
• Offline Insulation Monitoring Devices IM-04.INDD and IM-01.INDD Offline insulation monitoring devices for industrial use with disconnection contactor functionality.
• IM-04PV Photovoltaic Insulation Monitoring Device Insulation monitoring device for photovoltaic applications with voltage measurement capability, immunity against cloud and frequency disturbances using FFT technology, supporting voltages up to 1500 VDC.
• IM-04DCCT DC Charging Station Insulation Monitoring Device Insulation monitoring device for DC charging stations with voltage measurement capability.
• IM-01.MED Medical Insulation Monitoring Device Insulation monitoring device for medical use with Modbus/TCP interface, automatic network impedance recognition, and microSD card for usage history storage.
• IM-05DCCT Electric Vehicle Insulation Monitoring Device Insulation monitoring device for electric vehicles, battery stations, and DC drives, launched at Hannover Messe 2022.
• IM-01.INDM Marine Insulation Monitoring Device Lloyd's Register type approved insulation monitoring device for marine applications with Modbus/TCP interface for remote monitoring and controlling, supporting frequency converter applications.

Quantifiable outcome

• Medical transformers with inrush current typically under 3.5x In, eliminating need for separate limiting devices
• +3 more outcomes

Named customers5 records

Segments6 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Twelve partnerships are on record, tiered core and regional.

• Chenahoya Co., LtdcoreChannel Partner/ Reseller/ Distributor · 21 April 2021Chenahoya Co., Ltd serves as Trafox Chenahoya Monitoring Devices representative for mainland China. Located in Hong Kong, Chenahoya has been instrumental in introducing Trafox medical transformers and monitoring devices to the Chinese healthcare market, successfully completing hospital projects including Hebei Medical University Hospital and Sino-Japanese Friendship Hospital of Jilin University.
• ROTIMA AGregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Switzerland covering sales and support of Trafox products in the Swiss market.
• Wijdeven Inductive Solutions BVregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Netherlands covering sales and support of Trafox products.
• Acal BFiregionalChannel Partner/ Reseller/ DistributorTechnology distributor for Netherlands providing Trafox product distribution and technical support.
• BEDEK GmbH & Co. KGregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Germany covering Trafox product sales and support.
• ADBcomp BVregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Belgium covering Trafox product distribution.
• Hans Følsgaard ASregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Norway covering Trafox product sales.
• FG-Tech ASregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Norway for Trafox Superintend monitoring devices.
• Applied Power Technologies Inc.regionalChannel Partner/ Reseller/ DistributorAuthorized representative for Trafox Superintend monitoring devices in California, USA.
• Power Control ProductsregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Trafox Superintend monitoring devices in Colorado and Utah, USA.
• Unitrafo Electric AbregionalChannel Partner/ Reseller/ DistributorAuthorized representative for Sweden covering Trafox Superintend monitoring devices.
• Dacpol Sp. z o.o.regionalChannel Partner/ Reseller/ DistributorAuthorized representative for Poland covering Trafox Superintend monitoring devices.

Scale indicators4 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• ABB Ltd: Global leader in transformers, electrical apparatus, and power distribution. Overlaps with Trafox in power transformers, reactors, and electrical monitoring but operates at vastly greater scale and with broader portfolios.
• Eaton Corporation plc: Global power management company with significant presence in industrial transformers, reactors, and power quality products, competing for the same heavy industry and renewable energy customers as Trafox.
• Schneider Electric SE: Broad electrical equipment incumbent offering transformers, power quality solutions, and monitoring products that overlap with several of Trafox's product lines across industrial and renewable energy segments.
• Siemens AG: Major manufacturer of transformers, drives, and electrical components for industrial, marine, and renewable energy markets, with overlapping products in power transformers and frequency-converter-related filters.

Direct peers

• Schaffner Group: Swiss specialist in EMC filters, line reactors, and chokes for frequency converter and power electronics applications — closely comparable to Trafox's DU/dt filters, sine filters, and frequency converter reactors.
• REO AG: German manufacturer of chokes, reactors, filters, and transformers for industrial, medical, railway, and renewable energy applications — directly comparable specialty electrical components peer.
• Block Transformatoren-Elektronik GmbH & Co. KG: German manufacturer of transformers, chokes, reactors, and filters — a closely comparable specialty/custom electrical components peer serving industrial, renewable energy, and medical markets similar to Trafox.
• Würth Elektronik: Manufacturer of electronic transformers, chokes, inductors, and EMC components serving industrial, automotive, and renewable markets, with significant overlap on Trafox's choke/inductor and filter lines.
• Bender GmbH & Co. KG: German specialist in insulation monitoring devices and medical isolation transformers, directly competing with Trafox Superintend® IMDs and medical isolation transformers across healthcare, industrial, and marine applications.

Regional players

• Iskra d.o.o. Slovenian-based transformer and electrical equipment manufacturer serving European industrial and utility markets, comparable as a regional mid-market peer in custom and power transformer manufacturing.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Trafox