Nearly every circuit or subsystem, even those modest sub-one-amp designs, often needs a fuse to protect its own components or the load against internal and external faults. Thermally activated ...

Most places you live in today will manage their electrical power via circuit breakers, though fuse boxes predated that technology in the early 20th century.

Why are people scared of fuses? A properly installed fuse is just as safe as a circuit breaker, but there are many reasons why fuse panels can have problems.