Switch Gear
The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

100 A
more than 1000 A
300 A
200 A

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Switch Gear
An isolator is installed

always independent of the position of circuit breaker
generally on both sides of a circuit breaker
as a substitute for circuit breaker
to operate the relay of circuit breaker

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