Hello FvM,
ok, you can put two circut breakers in series, but then the first one must be 1,6 times more then the second one. So, when the second one is 100A the first must be 160A.
With a cable of 25mm² the max. current ist 125A. So a short circuit will not blow up the fuse of 160A only the cable. :evil:
This was the reason, why I wrote to use only one breaker and a switch.
This was the problem, when I make the installation of my workshop. The way from the main distributions board to my workshop is 50m. I need 25A here. so I must set the fuse in main distributions board to 35A. Therefore normaly 4mm² cabel is necessary, but about the voltage dropping I must need 6mm².
Regards
Rainer