Does this thing actually serve any purpose other than a junction?

https://www.classicindustries.com/product/1968/pontiac/firebird/parts/3882795.html

It is called a "fuse" junction block but I don't see anything about it that would appear to serve the purpose of a fuse. I had a starter go bad on me. I replaced the starter and all seemed fine but now I get nothing other than a single click sound and lose power to the cab. The link I shared above mentions "Once installed all of your cars power runs through this connector. Your car will notrun c orrectly without this item."

Thanks for any help you guys can provide!