ABB REJ603BB401NN3XE REJ603 Self-Powered Feeder Protection
Brand ABB Model REJ603BB401NN3XE REJ603 Introduction: REJ603 relay is intended to be used for the selective short-circuit and earth-fault protection of feeders in secondary distribution networks and for protection of transformers in utilities and industries. The relay is a selfpowered Numerical relay, which does not require external auxiliary supply voltage, making it an ideal choice for installation even in remote locations where auxiliary supplies are not available. The relay derives power for its operation from the current transformers. REJ603 is primarily used in Ring Main Units ( RMU ) within distribution network. Relay provides earth current measurement through internal calculation or has the provision for measuring it from the external core balance current transformer (CBCT). The key features of the relay are: Self-powered three phase non-directional overcurrent and earth-fault protection with DMT and IDMT characteristics Dual mode of