4. Fuse Failures

Question.3

During a short-circuit test on a 230VAC power input, the fuse didn’t just open — it shattered / burst, and black soot was seen around the holder.
What was most likely overlooked while selecting the fuse?

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Interrupt rating (breaking capacity)
Time-current curve (fast vs time-lag)
Fuse resistance / voltage drop
Fuse tolerance (±%)