Which of the following is the least expensive protection for over current in low voltage system? 

(A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
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Which of the following is the least expensive protection for over current in low voltage system? 

(A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

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