Critical Power Supplies Ltd

Critical Power Supplies is a leading independent UK multi-brand supplier of critical power and energy solutions including uninterruptible power supplies and standby power generators to 6MVA. As a multi-brand supplier we are well placed to provide you with the right power solution for your application and we work with a range of clients including M&E consultants, quantity surveyors, electrical contractors, distributors, resellers, corporates and end-users.

Whether you want an off-the-shelf, bespoke or turn-key solution, come and talk to Critical Power Supplies and benefit from over fifty years within the power protection and energy management fields. No other supplier can boast the depth of manufacturer knowledge available when it comes to standby power systems, generators, ups batteries, static transfer switches and uninterruptible power supplies.

Our Membership Includes:

In July 2013 we were awarded.

Click here for the Whale and Dolphin client testimonial.

Our complete portfolio includes:

Power Protection Systems

  • Uninterruptible power supplies to 6MVA
  • Standby power generators
  • DC standby power systems
  • Battery packs, stands and cabinets
  • Maintenance bypasses and switchgear
  • Static Transfer Switches (STS)
  • Power Distribution Units (PDUs)
  • UPS monitoring and control software
  • AC and DC power inverters

Power Services

  • Site surveys and turn-key project management
  • Electrical installation and commissioning
  • Battery build, testing, replacement and disposal
  • System decommissioning, relocation and disposal
  • 24/7 maintenance contracts with remote site monitoring
  • Battery monitoring systems including individual cells
  • UPS and generator hire

Renewable Energy Solutions

  • Solar panels and inverters
  • Wind turbines
  • Flywheels
  • Fuel cells

The Company.

Critical Power Supplies consists of two divisions focusing on the use of power and energy within critical installations. The company supplies individual systems and full turn-key packages with comprehensive 24-7 service and maintenance packages. The company is geared towards acting in the most environmentally friendly way and to providing its clients and stakeholders with an ECO approach to power and energy management.

The commercial arm of the business is based in Thame, Oxon from where the company supplies a wide range of off-the-shelf and built-to-order power and energy management systems. A nationwide service team provides round-the-clock maintenance to some of the UK’s most demanding clients across a broad spectrum of industries and disciplines.

Independent Expertise In Power and Energy Management

With over twenty-five years experience, Critical Power Supplies provides clients with an unparalleled ‘centre of excellence’ when it comes to the design, implementation and installation of power continuity and energy management systems. As an privately funded and owned business, the company is totally independent and is not tied to any one UPS manufacturer. It is in the enviable position of being able to offer the best possible solution to a clients needs, balancing total cost of ownership with resilience, efficiency and tomorrow’s concern for the environment.

A Consultative-Team Approach To Solving Power Problems

The Critical Power Supplies team comprises of people with long standing service within the power protection industry. They have helped to design, install and maintenance systems to power mission critical systems, many of which are at the heart of UK infrastructure. Our advise is impartial because we are not tied to anyone single manufacturer. Our clients get the most appropriate power and energy management solution to their power and energy problems. From our wide range of products and supply chain you can rest assured that we will design and install a system that will best meet your needs, both today and tomorrow.

After Sales Care

At Critical Power Supplies, we form long standing relationships with clients and have built our reputation on trust, respect and expertise. There are no ‘fit and forget’ solutions when it comes to power or energy management. That’s why we provide industry leading after sales service with manufacturer approved service engineers and partners. Quite simply we are available 24-7 to solve power protection and energy management problems.

Our after Sales Car Policies work hand in with the following directives but are not limited to them:

WEEE – Directive 2002/96/EC – Waste Electrical and Electronic Equipment (the “WEEE” directive). The WEEE directive requires that products sold into the EU be collected at the end of their lifespan. Critical Power Supplies Ltd operates an end of life management policy which ensures as much of the equipment is recycled as possible at the end of its life.

RoHS – Directive 2002/95/EC – Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (the “RoHS” directive). The RoHS directive restricts the use of chemicals in products of any description sold into EU countries and these chemicals are as follows:

1. Lead (Pb)
2. Mercury (Hg)
3. Cadmium (Cd)
4. Hexavalent chromium (Cr6+)
5. Polybrominated biphenyls (PBB)
6. Polybrominated diphenyl ether (PBDE)

Note : PBB and PBDE are flame retardants used in several plastics.

The maximum permitted concentrations are 0.1% or 1000 ppm (except for cadmium, which is limited to 0.01% or 100 ppm) by weight of homogeneous material. This means that the limits do not apply to the weight of the finished product, or even to a component, but to any single substance that could (theoretically) be separated mechanically—for example, the sheath on a cable or the tinning on a component lead.

Service Commitment

Critical Power Supplies is an independent power solutions and alternative energy management company. We supply solutions from a managed supply chain that has been designed to take the hassle out of critical power and energy projects for you. As an independent company our clients can trust us to offer the best possible solution, product and support services.

When you contact a Critical Power sales engineer you are immediately talking to someone with depth, experience and the knowledge to understand your power and energy problems and propose the most appropriate solution and installations package. We know power. We know energy.

Site surveys are always recommended for installations that cannot be classed as ‘plug and play’. Our power experts often attend sites to discuss roll-outs, turn-key packages and assess an installation to ensure it complies with our latest quality, health and safety, and environmental management systems.

Full turn-key packages can include other aspects of a data centre installation including air conditioning, cold aisle closures, access control, fire protection systems and emergency lighting. Our aim is to provide clients witha project management approach that is second to none in our industry.

To learn more about our service commitment see our Service Guarantee.

Quality, Health & Safety and Environmental Management Systems

Critical Power Supplies Ltd is committed to being the ‘best-in-class’ independent supplier of environmentally friendly, power solutions and protection systems. As part of this commitment Critical Power Supplies operates management systems in line with ISO 9001:2008 (Quality), ISO 18001:2007 (Health & Safety), ISO 14001 (Environment), ISO 27001 (Information Management). For more information contact us or view our Quality, Environmental, Health & Safety, and Ethical policies.

Download Area

In our download area we provide access to UPS datasheets, UPS technical specifications, UPS manuals, installation manuals and tender specifications.

Registration and VAT Numbers

Registered in England and Wales 07024862.

VAT number 982 5604 94.

Our Chosen Company Charities -

The team at Critical Power Supplies strongly believes in our corporate and social responsibilities and actively gets involved with the local community where we are based and charities that work across the UK.

Our chosen Charities are Cancer Research UK and Barnardo’s. After careful consideration the team choose these charities because they met the following conditions:

- Integrity and passion for the charitable work they are involved in.
- Effectiveness at supporting their work across the UK and overseas.
- Efficiency at helping people regardless of age, race, or social background.
- Ability to have a positive impact throughout their work with users, voluntary supporters, employees and sponsors.


Helping children across the UK create a better life.


Helping save people’s lives regardless of who they are.


Empowering People Around the World – To change their lives and start a business.

General Recycling Information – Click on the following link or simply call us for more information on 0845 519 3638.




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