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Fuses are designed to protect the wire, not the device. Nothing to do with the normal current draw. Wiring is sized to avoid voltage drop.

Also fuses are rated at continuous current but need about double to blow.
 

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Well, a device is designed to run on full rated power. What part of a device would a fuse protect? The fuse protects the wiring if the device fails or the wire breaks.

Also the fuses are a deliberate weak point, they do age and you don't want to have them blowing on a normal voltage surge from an alternator, so there's a bit of over design.
 
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