Answer Posted / samp

1. Isolator are devices they are auto-operated or manually
in off load condition, mainly for maintenance purpose of a
faulty line. Circuit breakers trip during fault or heavy
current flow in the transmission line.
2. isolator physically isolates line and it ensures the
service man his personal safety unlike CB as it is not much
transparent in its condition.
3.Isolators are always opened in no load condition(after
opening of CB) because it lacks the mechanism of operating
in high voltage.

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