The purpose of this fuse is to protect the rectifier diodes against
reverse polarity connection of the vehicle battery which would destroy
them.
It consists of a precision made high purity silver strip, surrounded by
fine quartz sand enclosed within a cylindrical ceramic body. This
design of fuse ensures that the current restricting section of the link
ruptures at high speed and at precisely the pre-determined current
level. This point will occur at the beginning of the fault current rise
and this the current will be prevented from reaching a damaging
level.
It is essential that only specified fuses should be used as replacements.
If such a fuse is not readily available the alternator should be kept
out of service until this fuse can be obtained.
