I agree with Joe. I never saw a fuse that did not blow on overcurrent or short/fault. If we all moved back to fuses, they could be designed so only the correct rating of fuse is installed for the conductor being protected. Toward the end there of the use of fuses that was being done with those screw in devices (I don't remember what they were called [Linked Image] )that reduced the size of the socket so that only the correct sized fuse could be installed.