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Founded in 1974, with headquarters in Sweden and operations in 15 countries across four continents, Powerbox serves customers all around the globe. The company focuses on four major markets – industrial, medical, transportation/railway and defense – for which it designs and markets premium quality power conversion systems for demanding applications. Powerbox’s mission is to use its expertise to increase customers’ competitiveness by meeting all of their power needs. Every aspect of the company’s business is focused on that goal, from the design of advanced components that go into products, through to high levels of customer service. Powerbox is recognized for technical innovations that reduce energy consumption and its ability to manage full product lifecycles while minimizing environmental impact. Powerbox is a Cosel Group Company.

Established in Japan 1969, COSEL is one of the world’s leading designers and manufacturers of high performance AC-DC Power Supplies, DC-DC Converters and EMI Filters. With quality, reliability & flexibility as our main focus, we pride ourselves on developing some of the highest quality and most reliable products seen anywhere in the world today. COSEL is a $284m global company employing some 790 staff with sales offices throughout Japan, Asia, Europe and North America.


Our products are at the heart of what makes delicate and complex systems tick. We take from volts to kilovolts, and from watts to kilowatts. We’re the people you turn to when you need to keep a high-speed train in motion, when power must be maintained safely underwater or at 36,000 feet, or when someone’s life depends on a steady power supply to a critical medical device.
We are masters of power.

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Head office

Västberga Allé 36A, 5tr
Hägersten, Sweden
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COSEL’s 3-phase, low-profile, high efficiency power supply delivers 3.5kW to highly demanding applications

COSEL Co, Ltd (6905: Tokyo) today announced the launch of the HFA3500TF, a low-profile 3-phase, 3-wire 3500W AC/DC enclosed power supply design optimized for industrial equipment such as semiconductor manufacturing, laser processing machines and robotics.

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POWERBOX’s COTS/MOTS 1000W IP65 rated power supplies are ideal for defense and harsh environments

Powerbox has announced the release of its new ruggedized series, the ECD1000A for ground-based defense applications and harsh industrial environments.

COSEL’s PDA series is 100% form, fit and function backwards compatible with the PBA series
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COSEL launches enhanced reliability power supplies for industrial applications

COSEL Co, Ltd (6905: Tokyo) has announced the launch of the PDA series of AC/DC power supplies with further enhanced reliability for industrial applications.

COSEL’s WMA series delivers efficient and reliable power to demanding medical and industrial applications
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COSEL announces launch of wide range of low profile, high efficiency power supplies for medical applications

COSEL Co, Ltd (6905: Tokyo) today announced the launch of a wide range of low profile power supplies for medical applications.

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