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About us

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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PRBX - A Cosel Group Company

Press office

For press related inquiries, please go to the press office.
Latest pressrelease:
COSEL expands microprocessor controlled power supplies offering for industrial and semiconductor industries

Powerbox distributors

Please find our distributors here.

Job openings


Sales Development Manager – New carrier opportunity at Powerbox Israel
Read more here: Sales Development Manager

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Our offices

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Head office

Industrigatan 8
646 35 GNESTA, Sweden
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Read more

COSEL expands microprocessor controlled power supplies offering for industrial and semiconductor industries

Cosel Co, Ltd today announced the addition of a 3000W AC/DC enclosed power supply for industrial and demanding semiconductors applications.

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Powerbox announces high peak load power supply for medical laser applications

Powerbox has announced the release of its new power supply solution for high peak load applications in the medical sector。

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COSEL expands UL/EN62368-1 certified low profile open frame power supplies for demanding applications

Cosel Co, Ltd (6905: Tokyo) today announced the addition of four new series of open frame, low profile, compact power supplies covering the range of 30W to 100W and UL/EN62368-1 certified.

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Powerbox announces industry’s first power supply for immerged computing applications

Powerbox has announced the release of its ‘industry first’ power supply solution for immerged applications such as hyper loaded computing machines。

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