4. Fuse Failures

Question.4

An automotive circuit draws 25A continuously.
A 30A blade fuse is used for protection.
The system works fine in winter, but in summer- high temperature (engine compartment), the fuse blows after some time. Why?

The fuse rating is too close to the operating current
The voltage rating of the fuse is insufficient
The interrupt rating is too low
fuse is not high temperature rated.

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