We are a leading manufacturer and provider of STANDARD (COTS), RUGGED, and CUSTOM Uninterruptible Power Supplies to meet with our customers specific requirements.
Please use the Products or Application Tabs above to review our full product offerings.

A full range of AC UPS suitable for Commercial / Marine / Industrial UPS Applications & Defence applications

Utilising COTS product Harland Simon UPS can manufacture power solutions to meet with a higher operating temperature, higher vibration, higher level of EMC or higher Ingress Protection

As a specialist custom UPS manufacturer, we have the team of experts to Design & Manufacture a Power Solution to meet with your specification and where a standard UPS will not be suitable. At our Milton Keynes facility, we have manufactured and have UPS products that meet MIL STD/DEF STAN, various Marine standards (DNV/Lloyds...)

Market Sectors

Alternative Power UPSCommercial UPS Military / Defence UPS Harland ProtectUPS Industrial UPS Marine UPSPower UPSPublic Sector UPS Transport UPS CNI Security Water UPS

News & Events

  • Harland Simon to supply UPS to Servowatch for IPMS critical back up power protection


  • A UPS does so much more......


    An Uninterruptible Power Supply is so much more than just a battery in a box, providing some back-up when there is a power failure, this is just the tip of the iceberg! This is an obvious feature, but is very important as critical loads must be supported at all times with UPS/Battery Packs and Generators, even in total blackout situations.

  • Marine & Industrial UPS 2018


    View our range of rugged, marine industrial ups for guaranteed 24/7 power protection for safety and cruising related systems on board. As a UPS manufacturer, our custom solutions integrate a reliable and proven Eaton UPS power module into an environmentally protected IP enclosure.



    The IP54 integrated system offers comprehensive power protection and battery backup for a range of industrial marine based applications i.e. critical IT equipment, thrusters, drilling drives, dynamic positioning, control and monitoring, communications, gas and fire detection, emergency lighting and onboard security equipment, etc.

  • IP54 & IP55 Increased Capability


    Our Enclosures have been TESTED / APPROVED to BS EN 60529, 1992, IPX4 (Protection Against Splashing Water) & IP5X (Protection Against Solid Foreign Objects, DUST Protected)

Case Studies

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