Power Systems International Limited is an Anglo Swiss owned company of the W & A Technology Group established in England by Bernard Wallace its present Managing Director and Chief Executive.

The company has an internationally recognized name for high quality, stylish, proven technology, custom engineered power conversion systems with over 75% of our business coming from important export territories managed from our international operations headquarters in Chalfont St Giles, Buckinghamshire England. View panorama>>

The company was originally named 'Borri Power Systems Limited, it was restructured in 1988 when we took over the business interests of the Wallace & Associates Technology Group power products marketing division and the business of Cyberex International Limited of the UK.
The name was subsequently changed to Power Systems International Limited to denote its important position in the international markets where industrial grade high security and absolutely reliable power products were demanded for critical loads of all types.

Power Systems International Limited is a niche market specialist power electronics company with over 25 years experience in the design, development and manufacture of custom engineered, special purpose industrial uninterruptible power supply systems (UPS), rectifiers, battery chargers, inverters, frequency converters, DC to DC converters, automatic voltage regulators, static transfer switches, power conditioners and distribution systems for all types of critical load applications.

We have supplied our AC and DC industrial power conversion systems to the oil and gas, water and electricity utilities and for the process industries, power stations, petrochemical engineering, industrial controls, airport avionics, navigation systems, defence, broadcasting, medical electronics, telecommunications, rail transportation and signalling applications in North America, Europe, Middle East, West Indies, Africa and Asia.
Our auxiliary power converters, inverters, DC to DC converters and battery chargers are supplied for use on board mass transit light rail, inter-city and metro vehicles and locomotives in Europe, North America, South America and Asia.

The “Borri Power” and “PSI” logos used on our products are our long established and recognised brand names for quality in power conversion and power security systems.