_________________ is used at stations to selectively shut down OHE supply over a part or sub-part of elementary section.
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A.
Insulator
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B.
Isolator
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C.
Circuit Breaker
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D.
Tripping Switch
Correct Answer:
B. Isolator
Explanation:
An isolator is the correct component for selectively shutting down the OHE supply at stations over specific portions of an elementary section. It is a manually operated off-load switch designed to provide physical separation for maintenance or fault isolation when no current is flowing through the circuit. While interrupters handle sub-sectors, isolators further subdivide these into elementary sections to ensure localized safety and operational flexibility.
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