An appliance draws a steady current of 5.0 A in normal use. Fuses of 3 A, 5 A, 7 A and 13 A are available. Which is the most suitable choice?

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Question

An appliance draws a steady current of 5.0 A in normal use. Fuses of 3 A, 5 A, 7 A and 13 A are available. Which is the most suitable choice?

Accepted Answer

The 7 A fuse — Award 1 mark. The rating must be a little above the normal working current, so the fuse survives ordinary use but melts quickly in a fault. A 3 A fuse would blow straight away and a 13 A fuse would allow a dangerously large fault current to keep flowing.

Answer

The 5 A fuse

Answer

The 7 A fuse

Answer

The 3 A fuse

Answer

The 13 A fuse

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