The current fuses are not the glass tube cartridge type. As they were used in helicopters and are mil spec so I would hope that they are fairly reliable. The one I am replacing wasn't blown but damaged - likely by me while trouble shooting a faulty radio. In any case, I do have a blade type at the battery and one fuse for each instrument. Now, when I add an ADS-B box, transponder, PowerFlarm and air conditioning I will probably re-wire. ;).