ABB REJ603 CT-Powered Overcurrent Protection Unit

Description

TheABB REJ603is aCT-poweredfeeder protection relay designed formedium-voltage secondary distribution networks. As part of theRelion® 605series, it provides numerical overcurrent and earth-fault protection without requiring any auxiliary power – greatly enhancing reliability in locations where power availability is limited. This makes the REJ603 highly suitable forunmanned substations,rural grids, andRing Main Units (RMUs). It features bothmechanical trip indicationandelectrical signaling, ensuring quick and visible fault confirmation even during outages. Its compact, plug-and-play construction simplifies installation, while its robust environmental tolerance ensureslong-term servicein harsh industrial and utility environments.