4. Fuse Failures

Question.1

A 230 VAC SMPS was designed with an input fuse rated 2A - 250V.
During servicing, someone replaced it with 3.15A - 250V, considering higher current rating will increase the safety.
Is this safe?

A) Safe — higher current rating gives extra reliability and gives protection from short circuits.
B) Dangerous — it reduces protection and can allow overheating during faults
C) Acceptable — same voltage rating and higher current overhead margin means it will protect the circuit and keep it safe.
D) Dangerous — because lower current rating is better than higher.

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