Schweitzer Engineering Laboratories (SEL) designs, manufactures, and supports a full line of products that keep electric power systems running safely and reliably. With manufacturing facilities in the US and Mexico, it produces generator and transmission protection systems, as well as distribution automation and control systems. SEL's engineering services division is capable of system design, construction, and commissioning for customers that include utilities, municipalities, rural electric cooperatives, airports, universities, refineries, and water treatment plants. Its government services division focuses on military bases and ships. In 2009 SEL became 100% employee owned.
Founded in 1982 by Edmund O. Schweitzer, the company introduced the world's first digital protective relay to the electric power industry in 1984. Today, its microprocessor-based protective relays, fault indicators, voltage controls, sensors, and portfolio of other products help to minimize the damage of blackouts and quickly restore power after an electrical outage.
The company has teams in more than 16 countries around the world that provide local sales and technical support service. A network of independent sales representatives and distributors provide additional sales support in many regions.
A specialist in electrical power product design and development, SEL is one of the fastest-growing private companies in the US, according to Inc. It experienced about 48% growth between 2006 and 2009, as environmental issues and the need for reliable power continue to drive demand. The company also continues to expand into different industries, as its products are finding application in lighting control, security, telecommunications, and industrial process control. – less