In general AC distribution systems, arc interruption in vacuum circuit breakers are designed to function in a time period of
- A. One cycle
- B. Two to three cycles
- C. Within ten cycles
- D. None of the above
Answer: A. One cycle
Explanation: In vacuum circuit breakers, the arc diffuses rapidly into the high-dielectric vacuum and is cleanly extinguished at the very first natural current zero (within one cycle).