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In the glass fuses' code F is for fast blown the second number is the current, but I do not know 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
    Commented Jan 19, 2020 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
    Commented Jan 19, 2020 at 13:01
  • \$\begingroup\$ Are you therefore suspecting that someone does have these data sheets then? \$\endgroup\$
    – Andy aka
    Commented Jan 19, 2020 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
    Commented Jan 19, 2020 at 13:05
  • \$\begingroup\$ Who makes them then? \$\endgroup\$
    – Andy aka
    Commented Jan 19, 2020 at 13:06

2 Answers 2

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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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They are apparently a different size 3/16 vs 4/16 diameter and 3/4 vs l inch length.

I base this on having just bought 5 amp which didn't fit a 5al socket.

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  • \$\begingroup\$ If you have a new question, please ask it by clicking the Ask Question button. Include a link to this question if it helps provide context. - From Review \$\endgroup\$ Commented Jul 26, 2023 at 9:55
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    \$\begingroup\$ @DanieleTampieri The expression "how do I know" is NOT asking a new question. It is an idiomtic way of saying "I know thi because ... " \$\endgroup\$
    – Russell McMahon
    Commented Jul 26, 2023 at 13:36
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    \$\begingroup\$ @DavideAndrea The expression "how do I know" is NOT asking a new question. It is an idiomtic way of saying "I know thi because ... " \$\endgroup\$
    – Russell McMahon
    Commented Jul 26, 2023 at 13:37
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    \$\begingroup\$ @Russell McMahon Yes, I understand that "how do I know" is NOT asking a new question.. That is unrelated to my evaluation that Harold's post does not answer OP's question. \$\endgroup\$ Commented Jul 26, 2023 at 14:44
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    \$\begingroup\$ @RussellMcMahon, thank you for pointing it out. However Harold's post in nevertheless not an answer. \$\endgroup\$ Commented Jul 26, 2023 at 15:09

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