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Auxiliary relay is a relay which will repeat the operations of protective relay such as tripping, time lag, breaking of trip circuit current, giving alarms and showing flags etc..
- Protective relay contacts are delicate and light weight hence it will not capable of carrying a large amount of current for a long period.
- protective relays do not have enough contacts to perform all the operations of protective scheme.
Therefore auxiliary relays, auxiliary switches and repeat contacts are used to assist protective relays.
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