5mm x 20mm Snap Glass Fuses
In order to ensure that you order the correct fuse, check the fuse details on the metal ring of the fuse you want to replace.
V = voltage / A = A / mA = milliampere.
You can also T or F T = Time lag delay or sluggish.
F = fast or fast fuse.
If there is no T or F, it can be assumed the backup is a quick / fast backup.