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An overload of electricity. Fuses are intended to be the weak link in case of an overload so they can be easily replaced. Otherwise the break would occur elsewhere and be more difficult to fix, and may even cause a fire.

Fuses serve one purpose and one purpose only. They are there to protect the wiring from overload. An overload without the fuse blowing will cause a fire.

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13y ago
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8y ago

The circuit is permitting too much electricity to flow. It could be the circuit is overloaded (too many things using too much power) or the circuit may be defective, and have a "short circuit", where wires touch each other. The fuse blows before the wires get hot and start a fire.

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8y ago

The most common factor is plugging in items that consume more power than the fuse or CB is rated for.

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Q: What causes fuses to blow?
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