1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
25
4. Technical description
The REJ 521 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 521 are explained in detail in the Technical
Reference Manual.
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