I am SLOWLY wiring my 16x17 layout (3-rail running DCS and TMCC thru 3 TIUs in super mode with 12 isolated blocks--no Legacy or conventional). My power sources are all 180W Lionel bricks. They have circuit breakers. I think those would pop before the fuse blew. So for my layout, I don't see the point of fusing the terminal blocks. I am just using old barrier strips from my junk box. No problems found so far (knock on wood and all other applicable superstitions).
Don