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A fuse is a safety device that lies in series in a circuit between an electrical source and its associated load(s). When the current, or flow of electricity, exceeds its designed threshold, the fuse is calibrated to permanently open the series circuit, thereby disconnecting the load(s) from the power source. Unlike circuit breakers, which can be reset to allow current to flow again, once a fuse disconnects, it must be discarded and replaced with a new fuse.

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Q: What is a fuse used for?
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