Power Systems International Ltd

Power Systems International Limited (originally 'Borri Power Systems 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 power products.

Our product range:
  • Industrial uninterruptible power supply systems (UPS)
  • Auxiliary power converters
  • Rack mounting
  • Plasma Physics Magnet Power Supplies
  • Pulsed and Continuous Power Systems
  • Rectifiers
  • Inverters
  • Battery chargers
  • Photovoltaic inverters
  • 400Hz and 60Hz frequency converters
  • DC to DC converters
  • Static transfer switches
  • Power conditioners
We have supplied our AC and DC industrial power conversion systems for the following applications in North America, Europe, Middle East, West Indies, Africa and Asia:
  • Oil and gas
  • Water and electricity utilities for the process industries
  • Power stations
  • Petrochemical engineering
  • Industrial controls
  • Airport avionics
  • Navigation systems
  • Defence
  • Broadcasting
  • Medical electronics
  • Telecommunications
  • Rail transportation and signalling applications
The familiar "PSI" and "Borri Power" logos on our products and documentation are our long established brand names recognised for quality in power conversion and power security by systems users in many countries. We are ISO 9001:2000 accredited.

Power Systems International Limited
- the ultimate name in power offering the finest of European made products to discerning customers in the markets where quality and reliability is demanded.

Lift Power Systems

As a recognised name for high quality and proven technology, we design and manufacture emergency lift power systems for evacuation lifts and lighting. All of our lift power systems are BS9999 compliant and are installed on emergency evacuation elevators in public buildings including libraries, schools and hospitals.

Please visit our website for further information on lift power systems.


Lift Power Systems

Aviation Ground Power Units

We specialise in the supply of aviation ground power units including power cables and connectors, cable reelers and hatch pins. Our 400Hz power airport ground support system is suitable for use with all kinds of aircraft. This unit converts 50Hz or 60Hz mains electricity into the 400Hz power required to power aircraft.

We design flexible and cost effective systems for mobile and fixed outdoor installation. Contact us to find out more about aviation ground power units.

Aviation Ground Power Units

Industrial UPS Systems

Industrial UPS systems are designed to provide power when the main power source fails, especially in an emergency. If you have equipment that requires protection from power cuts or surges look no further.

We supply a variety of industrial UPS systems to meet individual requirements. Our current range includes:

  • Custom engineered grade (CEG) UPS systems
  • E20 series
  • RTC series
  • Rack mounting UPS systems

Contact us for further information or a quote.

Industrial UPS Systems


At PSI, we provide inverters to convert DC to AC to suit a variety of industrial circuit loads. Our range of inverters are used by public utilities companies, HV sub stations, network control centres and nuclear power stations as well as surveillance centres, broadcasting corporations and telecommunication companies.

Our range of single and three phase inverters includes:

  • Rack mounting inverters
  • Photovoltaic inverters
  • Industrial inverters

DC Systems

Our DC systems convert AC into DC via a process known as rectification. These are designed for charging a variety of batteries and are often used in the telecommunications, power generation, energy lighting and process industries where DC loads are required.

Our DC systems include single charger systems and dual charger systems with features including:

  • 24V, 48V, 120V, 220V, 400V, 750V
  • 20 Amps to 2500 Amps
  • Compact robust design
  • High Efficiency
  • Low maintenance
  • Custom engineered specials

Please contact us here at PSI for more information on any of our products.


DC Systems

Power Systems International Ltd Overview