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100 Most Important MCQ Of Switchgear and ... - Electrical-Exam· Answer.4. Repeated duty. Explanation:-Air blast circuit breaker:- In this type of circuit breakers, the compressed air is used for the arc extinction.Hence it is called a compressed air circuit breaker. Those type of circuit breakers were employed in earlier days in indoor services for voltages ranging from 11 to 1100 kV with breaking capacities up to 25000 MVA.

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