A piece of metal heats up in both.
One melts, the other activates an electromagnet disconnecting the line, like the melted metal.
Material wise, they both have the same parts, one just has more.
Some fuses even have gunpowder in them to make sure it disconnects since it doesn’t always fully melt, kinda like using an electromagnet.
There’s also even Actual resetable fuses too








I mean the also added like 190#s straight to the face too
Edit, I meant 100, but yeah doesn’t matter.