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Answer:
Deponds on the load that is under protection
if it is a3ph load such a induction motor so automatic switch is beter
else if some single phase load on the3ph network are supplied so fuse is beter
Fuses always better because of high sensitivity . but Circuit breakers are more easy operation , only you have to switch on again after clearing the fault.
It is depend on application, but the fuse is faster is some applications.