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Reading Fuses

This revision is from 2010/08/10 21:35. You can Restore it.

I had to scrounge some of this together from a Google search and a visit to the Wayback Machine, so here it is in one place:

Take, for example, "F800mAL250V"

F "Fast Acting" (See below)
800mA 800 milliamps (if you have to substitute, go lower)
L General Application, Normal Blow. Protection of wiring
250V 250 volts (if you have to substitute, I am pretty sure you want to go higher)

Electronic European Fuse Markings(Edit)

FF or UR Very Fast Acting, Semiconductor Protection Fuse
F Fast Acting Fuse
M Medium Acting Fuse
T or a Snail Shell Slow Acting Fuse
TT Very Slow Acting Fuse

Industrial European Fuse Markings(Edit)

(gL, gG, gB, gTr, gR, aM, aR)

First letter(Edit)

g Full Range
a Partial Range

2nd Letter(Edit)

M Protection of electrical motors. Capable of withstanding motor starts.
L General Application, Normal Blow. Protection of wiring.
G General Application, Normal Blow.
B General Application, Normal Blow. Robust design for mining application.
Tr Transformer Protection.
R Very Fast Acting. Semiconductor Protection Fuse. What is the difference between aR and gR?