Mersen SA is a French multinational company specializing in electrical power and advanced materials for high-tech industries. Originally founded in the late 19th century as Carbone Lorraine, it rebranded to Mersen in 2010, honoring mathematician Marin Mersenne while acronymizing Material, Electrical, Research, Sustainable, Energy. The company operates through two main segments: Advanced Materials, which includes world-leading graphite anticorrosion equipment, brushes for industrial electric motors, and high-temperature isostatic graphite; and Electrical Power, offering solutions for energy management, power electronics components, industrial fuses, and rail current collection systems. Mersen serves critical sectors such as renewable energies including solar and wind, semiconductors, electric vehicles, railways, aerospace, and nuclear applications. With over 50 manufacturing sites and 21 R&D centers across 33 countries on five continents, it generates significant revenue from North America, Europe, and Asia-Pacific. Strategic acquisitions like Fusetech, GAB Neumann, and recent U.S. expansions in graphite and thermal technologies underscore its innovation-driven growth, holding leadership positions globally in key specialties. In 2024, it reported consolidated sales of €1,244 million, with more than 55% tied to sustainable development markets.