Thursday, August 11, 2011

Design Tip AR BLOCK

Why 94BF -1, 86 BF -2 trip no need to block the AR relay ?

The breaker status contact is given to AR relay to monitor the breaker.
AR relay give the close command if CB is in open condition.

Breaker failure operate means CB in closed condition and failure to open for trip command.

AR relay automatically blocked when the CB is in closed condition.

Therefore separate close block no need from 94BF -1, 86 BF -2.

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