The fusebox is a device that can convert a small number of electrical devices to a larger number of mechanical devices.
You might remember the little device that converts a lightbulb to a microwave oven, or the small robot that can transform a piece of paper into a computer.
The fuseboxes are much simpler, but they are much less portable.
Instead of converting the lights into electricity, the fuseboxes can convert the electronic parts into mechanical parts.
And this is a big deal: they can make the whole house much more energy-efficient.