Science · 6 pages · 12 min

How a fuse protects a wire

A fuse is a short metal link meant to melt and open the circuit before the wiring does.

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From the opening

A fuse protects a wire by being the piece that melts first when current stays too high. The melt opens the circuit, the current stops, and the cable in the wall is no longer asked to carry the overload that was heating it. The opening covers why the link is the thin piece, how time and current both count, and what a thicker link fails to save.

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Inside

Why the link is the thin piece
How time and current both count
What a thicker link fails to save
Why a fuse is not a shock guard
Where the idea stops applying
A distinction worth keeping

Sources

A sacrificial fusible link in series with the load
Overcurrent heating that threatens wire insulation

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How a fuse protects a wire

From the opening

Inside

Sources

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