The ABB REF615E_G is a member of the Relion® 615 series, representing an "E" (Enhancement) level feeder protection relay. The "_G" suffix specifically denotes a hardware variant optimized for applications requiring an integrated **Graphic Display and an expanded Human-Machine Interface (HMI) with a larger keypad. It is designed as a comprehensive "all-in-one" device for protecting, controlling, and monitoring medium-voltage (MV) distribution feeders, particularly in applications where local operator interaction is frequent or essential.
