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A fuse has no charge, i.e. it is free.

A fuse is nothing but a small electrical conductor with a known resistance [ R ] and a known melting temperature.
When current [ I ] flows through it, it dissipates power at the rate of [ I2 R ], which heats it.
The whole purpose of the fuse is to become hot enough to melt when the current [ I ] exceeds some number,
in order to 'open' the circuit and stop the flow of current.

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