Circuit breakers usually operate under______________?
Correct answer: A. transient state of short-circuit current
- A. transient state of short-circuit current
- B. sub-transient state of short-circuit current
- C. steady state of short-circuit current
- D. after D.C. component has ceased
Explanation
A circuit breaker must interrupt a fault before the short-circuit current reaches steady state, while it still has transient behavior and often a decaying DC component. Hence it normally operates during the transient state.
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