A cartridge fuse found in amperage sizes 60amp or lower. This group also includes midget, glass and ceramic fuses with the exception being that these fuses are used for electronic devices. If you are asked for a cartridge safety switch, it refers to a 60 or 30amp switch. The item code shown below is a reference to one type of fuse and isn't an indication at all of what the customer wants. You need to know amperage, voltage, UL Class, interrupting rating and most importantly, application.