It is a member of ABB’s Relion protection and control product family and is part of the 605 series. The 605 series relays fulfil the essential protection needs of medium voltage networks with an optimised composition of protection and measurement functionality in one unit, at a competitive price.
REJ603 is a current transformer (CT) powered numerical feeder protection relay designed for applications where auxiliary power is not available or cannot be guaranteed, thereby making it an ideal choice for installation in remote locations. The relay is primarily intended for use in ring main units and secondary distribution switchgear within distribution networks. It can measure earth current by internal calculation and also by external core balance current transformer/split core CT input.