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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
| Fuse Marking | Example | More Information |
|---|---|---|
| Manufacturer / Brand: | Bussmann | View all the brands we sell |
| Part number / Series: | NSD20 | Search for fuses using part numbers or keywords |
| Ampere Rating: | 20 A | Search for fuses by ampere rating |
| Interrupting Rating: | 80 kA | Explanation of Interrupting Rating |
| Voltage: | 550 Vac | Search for fuses by voltage |
| Element Speed: | gG/gL | Learn about fuse speed markings |
| Approvals or Standards: | BS88 | View all approval markings |
| Fuse Dimensions (Cartridge fuses): | 10 x 38 (mm) | Search for fuses using dimensions |
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Want to know more? View all fuse tutorials. |