Does an MV-fuse link limit the peak current under short circuit conditions in an electrical system?
Yes current limitation depends on the short circuit conditions (prospective value, power factor, making angle at the beginning of the short circuit). Cut-off current characteristics, given by the manufacturer of the MV-fuse link, show maximum values of limited current reached in the worse conditions. For example a prospective short circuit current, which is the value of a current that would flow if there would be no fuse protection in the circuit, of 10,000 A r.m.s. with a totally asymmetrical current, the maximum value could reach 25,000 A peak. A 100 A MV-back-up fuse link limits the first peak to 8,000 A, less than the third part of the prospective maximum value. The destructive electro-dynamic effects are reduced by 90 %(8,000/25,000) !
