Quote:
Originally Posted by thingstodo
A 300A rated slow-blow fuse, if that's what you are using, will let through a lot of energy before the element melts. All of the industrial VFDs that I have taken apart use a fast-acting DC fuse on the DC bus. Siemens appears to use 2 fuses in most of their VFDs, one for the + buss and one for the - buss.
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Nope regular ferraz shawmat 400v 300 amp. I believe I r2 is around 1000 amps for 10 seconds which is shorter than temperature coefficient on the cables I have