Why is fuse

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Why is fuse connected in live wire only
https://why-is.org/fuse/connected-in-live-wire-only/
Why is fuse wire used in electric circuit
https://why-is.org/fuse/wire-used-in-electric-circuit/
Why is fuse used in wire
https://why-is.org/fuse/used-in-wire/
Why is fuse used in household wiring system
https://why-is.org/fuse/used-in-household-wiring-system/