Question about Brennenstuhl CleverLine

This is a fuse !!!
Like the fuse at home.
The red button pops out in the event of a short circuit, for example, and can be moved back in again after it has been rectified.

Power interruption at the touch of a button, as long as you keep it pressed, no connection has power. Useful/meaningful? Well... I wouldn't know what to use the button for in real life...