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In the glass fuses' code F is for fast blown the second number is the current, but I ignore what is the difference between L an AL (if there is any).

Could someone explain this.

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  • \$\begingroup\$ Please link to both data sheets. \$\endgroup\$ – Andy aka Jan 19 at 12:58
  • \$\begingroup\$ @Andyaka Unfortunately, I haven't any datasheet otherwise it would have been enough to read them to find the answer. \$\endgroup\$ – AndreaF Jan 19 at 13:01
  • \$\begingroup\$ Are you therefore suspecting that someone does have these data sheets then? \$\endgroup\$ – Andy aka Jan 19 at 13:02
  • \$\begingroup\$ @Andyaka It's enough to find someone that has experience with the fuse code letters. The labeling is pretty standard for the glass fuses. \$\endgroup\$ – AndreaF Jan 19 at 13:05
  • \$\begingroup\$ Who makes them then? \$\endgroup\$ – Andy aka Jan 19 at 13:06
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They are the same 5A 250V fast acting low breaking capacity fuses (just one omits the A of ampere)

The glass cartridge fuse code is structured in this way

|Acting Speed| |Current rating| |Breaking capacity| |Voltage rating|

or

|Package size code| |Acting Speed| |Current rating| |Breaking capacity| |Voltage rating|

Acting speed

The time it takes for the fuse to open when a fault current occurs. It code could be:

FF - Very Fast Acting (Flink Flink)

F - Fast Acting (Flink)

M - Medium Acting (Mitteltrage)

T - Slow Acting (Trage)

TT - Very Slow Acting (Trage Trage)

Fuse Breaking Capacity

It is the current that a fuse is able to interrupt without being destroyed or causing an electric arc with unacceptable duration. The capacity of a fuse to operate between the lowest and the Rated Breaking Current code could be:

H - High Breaking Capacity

L - Low Breaking Capacity

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