Technical Description - ABB REJ 525 Operator's Manual

1MRS 752137-MUM
4.
Combined Overcurrent and Earth-Fault Relay
Operator's Manual

Technical description

The REJ 525 is designed to be used as a secondary protection relay in medium
voltage distribution systems, where the relay can be applied as the main or backup
protection relay of an object. It can also be used for protection of generators, motors
and transformers. The whole function software used in the relay is preloaded into the
program memory at the production stage.
The operation and the features of the REJ 525 are explained in detail in the Technical
Reference Manual.
REJ 525
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