Fuse Markings
Markings on Electronic Cartridge Fuses
Table 1. Fuse Element Speed Markings
Marking |
Fuse Element Speed |
FF |
Very Fast Acting (Flink Flink) |
F |
Fast Acting (Flink) |
M |
Medium Acting (Mitteltrage) |
T |
Slow Acting (Trage) |
TT |
Very Slow Acting (Trage Trage) |
Table 2. Fuse Breaking Capacity Markings
Marking |
Fuse Breaking Capacity |
H |
High Breaking Capacity |
L |
Low Breaking Capacity |
Note: Many small cartridge fuses will have additional markings stamped on the end caps.
These are usually either; a series number, a part number, or
product approval markings (refer table 3 below).
If you are unable to identify the fuse, please contact us.
Table 3. Quality & Approval Markings on the fuse cap
Marking |
International Standard |
 |
Canadian Standards Assocation (CSA) |
 |
Equipment complies with Council of the European Union (CE) |
 |
International Electrotechnical Commission (IEC) |
 |
Technischer Uberwachungs-Verien (Germany - TUV) |
 |
Underwriters Laboratories (Listed - USA) |
etc. |
View more product approval markings |
Markings on Industrial Fuses
As these fuses are larger in size, there is usually a lot more information printed on the fuse body.
This information that is likely to be found on the fuse is summarised in the following table.
Common Markings on Industrial Fuses