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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is

750 A
1500/√3 A
1500 A
None of these

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An isolator is installed

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

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The material used for fuse must have

high melting point and low specific resistance
Low melting point and low specific resistance
low melting point and high specific resistance
low melting point and any specific resistance

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