I am looking for advice on fuse sizing for a semiconductor type fuse for a
70kW AC drive system.
Worst case pack voltage under max load would be ~300vdc so max current would
be ~233A.
I notice that DC systems use fuse ratings well below the theoretical max
current.
For instance, when using a Zilla 1000A controller they recommend a 500A
fuse.
I know that typically a series DC motor/contoller combo hits max current
only briefly when accelerating, but an AC system is more
of a constant torque (constant current?) arrangement.
It seems to be a bit of a guessing game. You don't want to go too high as
you may sustain more damage before the fuse opens.
On the other hand, if you go too low you could get unexpected fuse openings.
So, am I looking at using a 200A or 175A or even a 150A fuse?
Thanks, Al
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