Yes it will. If the wire is all the same then one fuse can protect from the switch to the battery BUT if you pull other loads off that buss bar then they need to be protected for the wires ampacity rating. If you lowered the ga of the wire from the buss bar to the switch from 1/0 to 1ga then you'd need a smaller fuse unless the fuse protecting the 1/0 was not to the max of the 1ga wires ampacity limit.
Thanks Maine Sail, that makes perfect sense. Thanks!