Hi,
I’m a bit late, but I can contribute something from my installation.
I have also used NH00 fuse-disconnectors to protect my multis and RS450/100.
For that I used the triple holders from Rittal. The charm is that you can isolate all 3 multis at the same time.
The NH00 from Simens have a switching capacity of 25 kA DC (IEC 60947-2) and range from 35A to 160A