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What are the functions of switches and fuses?

Updated: 8/20/2019
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12y ago

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A switch is a mechanical device for controlling the flow of current in a circuit, switching the current either on or off.

A fuse is designed to melt safely when a current exceeding its maximum current rating passes through it, thus protecting the service wiring supplying power to the connected load.

For example, if the connected load develops a fault which causes a high short-circuit current to flow in the service wires, if there's no fuse to break the flow of current then the service wires would get very hot and could cause a home fire.

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Q: What are the functions of switches and fuses?
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