REX610 is a freely configurable all-in-one protection relay that covers the full range of basic power distribution applications, without forgoing simplicity. The small number of variants translates into easy ordering, set up, use and maintenance. Rich in functionality, with a fully modular hardware unlocking all available functionality, REX610 represents both a flexible and cost-effective choice. As part of ABB’s Relion® protection and control family of relays, REX610 builds on ABB’s strong heritage of freely configurable multifunctional relays and many proven protection algorithms.