at first thnaks alot who made such a useful site.
I want to know weather there are fast acting fuse with high
amper for example 150 or 200 amper.If yes , do they have a
special sign or not.
thank you.
It depends what do you consider fast. A conductor which
can carry 200A can't melt instantly -- you may want to
consider electronic solution. Ir even may be resettable
so you don't need to replace it.