I have a 12VDC cuircuit board with a blown glass fuse (careless wrong polarity). The bands are brown, blue, red plus a wide blue band. Looking at the chart it says the time/current rating is T. Is this a quickblow fuse?
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\$\begingroup\$ Glass fuses have color band markings? Can you post a picture? \$\endgroup\$Lundin– Lundin2024-04-26 11:51:13 +00:00Commented Apr 26, 2024 at 11:51
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\$\begingroup\$ see also: EE@SE posts containing T, fuse, blow \$\endgroup\$greybeard– greybeard2024-04-26 11:54:24 +00:00Commented Apr 26, 2024 at 11:54
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3 Answers
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T is for slow blow, F for fast, FF for very fast.
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\$\begingroup\$ (I "knew" explications different from Timed & Fast.) \$\endgroup\$greybeard– greybeard2024-04-26 11:55:27 +00:00Commented Apr 26, 2024 at 11:55
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2\$\begingroup\$ I thought 'FF' was just a gag of yours, for "?*%£in' fast", but a search shows it's a real one :-) Upvoted. \$\endgroup\$TonyM– TonyM2024-04-26 13:26:10 +00:00Commented Apr 26, 2024 at 13:26
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1\$\begingroup\$ I really wonder where the letters have their origin... German electricians know them as "Träge" and "Flink". \$\endgroup\$asdfex– asdfex2024-04-26 13:28:22 +00:00Commented Apr 26, 2024 at 13:28
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- T = Time-lag.
- F = Fast.
See more here: What fuse can I use to replace this old glass tube fuse?
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If you don't have the datasheet: T or "Time-Delay" is generally used for slow fuses.
If you have the part type, it is better to check the datasheet.
