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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

COSEL Corporate
COSEL Europe

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Senior developer power converters – New carrier opportunity at Powerbox Sweden
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Senior software developer Digital power – New carrier opportunity at Powerbox Sweden
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Our offices

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Head office

Västberga Allé 36A, 5tr
Hägersten, Sweden
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COSEL expands its value added STMGF DC/DC converter platform with 80W unit for industrial applications

COSEL Co, Ltd (6905: Tokyo) today announced the addition of an 80W DC/DC converter to its value added STMGF platform. Available in two versions, the STMGFS80 covers all industrial voltages from 9V to 76V.

Senior developer power converters
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Powerbox (PRBX) Sweden relocates and expands R&D in Stockholm

Powerbox announces it has consolidated its Swedish operations to a new facility located at Hägersten, South of Stockholm.

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COSEL announces free-air convection cooled open-frame power supplies with 200% peak-power for industrial applications

COSEL Co, Ltd (6905: Tokyo) today announced the addition of 150W and 300W free air convection cooled power supplies, the LHP150F and the LHP300F.

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COSEL announces 300% peak power open-frame power supplies for medical and industrial applications

COSEL Co, Ltd (6905: Tokyo) today announced the introduction of 600W free-air convection cooling power supplies, the AEA600F series.

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