If a combination of HRC fuse and circuit breaker is used, the C.B. operates for
- A. Low overload currents
- B. short circuit current
- C. Under all abnormal current
- D. The combination is never used in practice
Answer: A. Low overload currents
Explanation: In a coordinated protection scheme, the circuit breaker handles normal switching duties and clears low overload currents, whereas high-speed HRC fuses take over to isolate heavy short-circuit fault currents.