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Our Defence business has been established for more than fifty years. Specialists in the field of naval power conversion and distribution, we have equipment in service on virtually all of the Royal Navy’s submarine and surface fleet. That we continue to support equipment supplied over 50 years ago and in service ever since is a testimony to the integrity of our designs and the highest build standards that we have always attained.


Many of our designs distribute power with battery support. This theme of supporting critical on board functions such as emergency communications and lighting – often after all other sources of power have been lost – indicates the critical importance of our equipment to the vessel and its crew and the role that we play in supporting so many of the world’s Navies over the years.

We have also built up a strong export business and our equipment is deployed on many foreign Navies from Australia to Malaysia, from Oman to Spain, Turkey and Japan. Latest designs support a number of current European warship programmes including the S-80 submarines being built by Navantia at Cartagena in Spain and DCN's Scorpene Class submarines. We are supplying DC and Helicopter start systems to Australia’s Hobart Class destroyers. We are the chosen supplier for Converted supplies and UPSs for the Royal Navy's new AAW Destroyer the Type 45 and are fully represented on the new Queen Elizabeth Class aircraft carriers. More recent successes are the supply of chargers for Scorpene submarines for Mazagon Dock in India and a £2m order to supply UPSs and Battery Chargers for MARS tankers being built by Daewoo (DSME) in Korea.









With over 50 years designing, manufacturing and supplying power supplies for some of the most demanding applications, Gresham has a strong reputation for service and support.  We offer a wide range of both standard and custom power supplies with many items readily available from stock.


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Headquarters: 48430 Lakeview Blvd. Fremont, CA 94538

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