The Legrand S 303 D1 DX is a 3-phase distribution board designed and manufactured by Legrand, a French company that specializes in production of electrical power distribution boards. The S 303 D1 DX is a self-protected, modular enclosure with an IP 3X rating, designed for indoor use only. It is suitable for 50 or 60 Hz systems and can accommodate a variety of circuit breakers and accessories. The enclosure is constructed from steel with a polyester powder-coat finish, and it is equipped with protective earth terminals, line terminals and neutral bars aside from its load terminals. Additionally, it has a snap-in locking system and optional components such as ducts, doors and drill-holes for routing and cleating flexible cable. The S 303 D1 DX can be used in residential, commercial and industrial electrical systems, and is certified to IEC 61439-2, VDE and UL standards.