When the fuse melts. Its does not eject, Its indicator LED bulb difficult to read.
There is not enough fuse sizes on the market to coordinate with the fuse link on the primary transformer.
Low cost
Eject indicator for easy identification of a damaged fuse causing the fuse holder to open and drop.
The fuse is installed inside a fuse holder with arc-extinguishing properties, producing a gas that eliminates the arc when fuse element failure occurs.