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Fuse Identification Mystery Marking Revealed. Slow Blow Vs Fast Blow Used In Electronics Repair.
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- เผยแพร่เมื่อ 16 ส.ค. 2024
- tvrepairinfo.com/
In this video I talk about the different kinds of fuses I've encountered in my Electronics Repair business, and some of the misconceptions myself and others have had in being able to identify slow Vs fast blowing fuses by appearance alone. Especially pertaining to Ceramic Fuses which aren't necessarily slow blowing.
I said something incorrect in this video concerning the use of a lower voltage fuse where it calls for a higher voltage one. I thought it was probably okay but I've since been informed it's not a good idea. It's generally okay to use a higher voltage fuse in place of a lower voltage original, but it's not recommended you use a lower voltage fuse where it calls for a higher voltage fuse.
Love the comments about secret societies. I spent 5 minute copying the symbols only to find out from you that they are irrelevant to determining the type of fuse used in my subwoofer . I also now appreciate the reason it is ceramic (vibration resistant) not just because B&W wanted to make it as difficult as possible to source a spare . Thanks mate.
Very good Dave, you're the best! Your videos are one of the most informative and useful in the entire TH-cam. So keep it up, keep helping people
+Gen Rai Thanks :-)
Much appreciated! Lots of very good information about fuses in this one video.
I was looking for fuse information while trying to figure out the correct fuse to use in a Cen-Tech digital multimeter that states on the 10ADC line are 10A max; then on V Ohms mA line to COM is CAT. II with a rating of 750VAC/1000VDC/200mA max. It's recommended by some guides online to use a 500mA 5mmx20mm glass fast blow fuse... however this seems to contradict what is printed on the front of the unit. The instruction manual doesn't give any information for replacing the fuse (unfortunately). I think I might have to use a 200mA 250V 5mm x 20mm glass fuse although a ceramic one might be fine to use as well. I misplaced the original fuse that was in the unit so I am unable to confirm what was originally in there but I suspect it was rated for 200mA.
A lot of the markings is to show which testing agency that has verified the tolerances and reliability of the fuses.
Interesting video. One thing about the thermal fuses... the wires attached to them are usually crimped-on because the heat from a soldering iron could be enough to cause the thermal fuse to fail open (I learned that the hard way many years age).
@4:00 haha that "LF" was exactly what I was trying to figure out, thought it meant fast. Thanks for sharing.
same here :)
Me too! And that dot is such a stupid idea. I thought my fuse was .1mA.
Pulled out a T1AH250V fuse out of my DVD player(ceramic). Went to the store they gave me F(with little F in it)1A250V and told me that amperage and voltage is right so screw the letters. Bullshit. The power button lit up and as soon as I tried to press it to turn it on the fuse blew.
Thank You: I just pulled a 3AG fuse 4.0A 250V out of my Guitar Amp. (312)
It’s supposed to be SLO-BLOW, according to the back of the amp & the Manual !!
I too have a supply of Fuses, since I serviced amps a long time ago !!!
Construction wise, it looks like a FAST BLOW ???
In my supply I Have Both: ALL LITTLE FUSE
I SAW ON YOUR CHARTS: “312” is FAST & “313” is SLOW !!!!!!!!
THEREFORE: the DEAD fuse I removed was wrong (312) AND I KNOW THE FUSE I JUST PUT IN IS SLOW, PLUS IT IS MARKED “313” !!! AGAIN: THANK YOU !!!
Your videos are short, yet very informative. Thank You!🕺
I think crimping the thermals is because the heat conducted in to the thermal from soldering would open it..
That makes sense. I suppose another thing to consider is that solder can melt in high temperature situations. Thanks for the info.
Cool, my chargestar 15 car battery charger has a glass T630maH L250v fuse so this was very informative. Thanks
If you want to solder a low temperature thermal cutout or fuse you can place several clamp-on heat sinks on either side of the joint and solder them together quickly.
Good idea.
awesome info on fuses, thank you sir. i want to save this info for future referance
I like how organized you are. good video.
6:11 - I have replaced fuses that look like this and other similar form factors in commercial and industrial fused disconnect switches that feed motors or other single or three phase instruments
72 / 5000
Congratulations for the initiative. Very useful and with great tips. Thank you very much.
in thousands of service calls I have actually seen less than a handful of ceramic slow blow fuses the meter good but will pull no current I guess there's just enough metal oxide in the sand after it blows?
love your videos keep up the good work
+Bret H It sounds like your saying you have seen blown fuses that still had a remaining conductive path due to the internal sand. I have never seen this before. not even once in all the years I've been doing this.
+Grants Pass TV Repair ....yeah its a real head scratcher but if you gave them a thump with your handle of your screwdriver they would quit me metering good two of them that I ran into were of the same value and brand in the same type of amusement machine from the mid 50's
+Grants Pass TV Repair the third one I found was in a 1980'S cd jukebox I recall military spec markings on all of them
+Grants Pass TV Repair have seen amusement equipment from auction with uses replaced with diodes and they works great!
all the best from Southern California
Pls August why plug fuses are colour coded?
The SA in the circle is Canadian Standards Assocation (CSA)
Very informative, thanks !
I couldn't though identify fore sure the some of the markings on mine (a 1/4" x 1 1/4" 250V 8A fuse used in a 120W Eliminator 12v-115V Inverter ). There is "AFE" and "JET" and "CQ" that I am not sure what they stand for... but I suppose that the "F" in "AFE" means that it is a fast blowing fuse?
The other markings I see on that fuse, and that I recongnized on your charts are the losange with PSE, UL and CSA.
(p.s. not sure if that's only me, but the video terminated abruptly, it looks stripped at the end?)
I have saved it in my DIY playists for future reference !
I still run into a few symbols and markings I don't understand, so what I didn't mention in this video is probably beyond my knowledge, but I'm glad you found some of it was helpful.
what will happen if my tv says to add t3.16(slow fuse) but i added a f3.16(fast fuse)?
Thanks for a great explanation of those arcane fuse naming systems. Regarding ceramic fuses, do I understand correctly that an "H" designation doesn't correlate with slow blow or fast blow? I have a ceramic fuse from a Panasonic microwave that's designated 6H20A250V, and can't figure out whether it's a fast or slow blow fuse.
Yes you are correct about the letter H. It only represents the fuses ability to withstand mechanical damage. Unless your fuse has other letters or numbers I have no way of knowing if it's a fast or slow blow fuse.
H and L breaking capability does not indicate how mechanical robust a fuse is, but which short circuit current it could break (clear the arc), Low does only about 35A so it is used secondary, H does break about 1000A and can be used on the primary side, and then there are fuses suitable in CAT II and CAT I measurement instruments that break about 10000A.
bird I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe.
I got it in my about tab.
Thanks Dave. I'm surprised that you didn't mention electronic fuses.
+Robert Calk Jr. Thanks for the suggestion. I just changed the title to something more descriptive.
+Grants Pass TV Repair
I mean resettable fuses - PPTC's.
Oh Okay. That sounds like somthing
I need to learn more about myself.
I have a 65TL 250v 8A ceramic fuse. What does this numerical designation mean?
Hi I had my bheringer midi pedal which has blown fuse. It needs glass fuse with below specs.
Fuse. T 100 m A L 250V
Can you please help.
Thank you Kerol
Thanks so much for the information Sir.
This was a lot of help, thanks for sharing!
Great video explanation of the various fuses. I came across your video while trying to figure out if I have a fast blow or a slow blow glass fuse I need to replace. It came out of a Panasonic VCR model PV-4214. It is from the power supply module. It measures 5mm x 20mm and states 125V 1.6A on one end and 51S on the other end. The filament is not visible due to black inside part of the glass. Any idea if it is fast or slow blow?
I wouldn't be able to figure that out, but the worst case scenario if you use a fast blow fuse is it may open. A slow blow fuse just buys you a little more time if you exceed it's capacity.
@@GrantsPassTVRepair Thanks for the rapid response. I just used a magnifying glass to look closer inside and noticed 2 solder beads rolling around. Would that indicate a slow blow fuse?
@@jimstelljes3925 If the particles are rolling around I'm not sure what to think, but if it were an unknown to me I'd just try a fast blow fuse and see what happens.
@@GrantsPassTVRepair I am going to heed your advice and go with the fast blow to be safe. The 2 solder beads inside the fuse have the wire filaments sticking out on both ends. That's why I thought it might be a slow blow fuse. I see printed on the circuit board 1.6A125V with a fuse symbol inside a triangle.
@@jimstelljes3925Do you know why the fuse blew in the first place? It generally means the circuit has a problem, and you will keep blowing fuses if you don't repair the issue. Once and awhile a fuse opens up even though the circuit is okay, but not to often.
I think I've got a better understanding now of what I'm looking at but I would like to make sure.
When I'm looking up the fuse I need (T10L250V), I get results of all three different slow blows...the coil...the straight one....and the one with the bead of solder. Is there any difference between the types or are they just different designs of the same thing?
hi
what that main Fuse FB?
i know SMd Fuse but how much voltage and Amper
Thank`s
Hi thanks! A Q: Have a package of glass fuses and it does not stand the voltage just the ampere.It has a number on it that says: 04.07204.00 / 4661.971...
I wouldn't know what all those numbers mean.
Good video. Many thanks sir.
In cars it was common to have a fuse-able link near the battery. It looks just like regular wire coming off the + terminal.
+Kent Diego I've always wondered why they used those fuse-able links rather than just a few extra fuses.
+Grants Pass TV Repair I am guessing cost and mechanical reliability. The link is basically just wire so it's cheap and easy. A fuse at the battery will corrode from acid fumes and likely fail. An extra fuse holder and connections will add cost too.
I suppose corrosion could be a good reason. It's certainly an issue with battery terminals.If given a choice I would prefer a well sealed fuse that I can easily test rather than having to poke through the insulation on a fusable link.
Great work
Please explain series 313 fuses.
I need help with a fuse. The fuse is HRC cartridge fuse - cylindrical type gG 10 x 38 - 8 A - without indicator - 0 133 08. Is it fast acting or time delay. It's from France. Thanks in advance.
Sorry but I don't recognize all those numbers.
Can you please tell Fuses with High inrush current are slow blow or fast blow?
Can you clarify your question?
why russel andrews fuses cost £25?
Thank you for the video.
Thank you!
Got some BUSSMAN CERAMIC FUSES
20A / 250V 6.35mm x 31.75mm with the RU (BACKWARDS R) symbol but no other markings. Any idea if they are slow or fast blow? EDIT: found it, they are fast-acting or fast blow, then I rewatched your video & seen at 3:11 your chart shows ABC as the fast blow marking. Thanks!
Hi. I have power supply for a USB enclosure. Is this a Slow or fast blow. It seems to be a ceramic radial (which in the middle, opaque), through hole. This are the specs:
250V
2A
It has this some, kind of math division: Ds/T
It's about a few millimeters in thickness and about 1cm in length.
When read by a multi-meter is read: OL
Is this fuse dead?
God bless, Rev, 21:4
Seven I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe.
I got it in my about tab.
Hi how are you? I own a subwoofer that comes from Europe (where voltage is 220) and I don't know if it will work fine with his T1AL (230v) fuse or I have to change it with a T2AL(115v)? Thankyou!
I live in Colombia and voltage here is 110
I don't know what the numbers mean, but I was taught not to worry about the voltage difference with fuses, but only the current, and if it's a fast or slow blow type, and and it's never been problem for me.
@@GrantsPassTVRepair Thank you,
I just read that "T" is for "slow blow" and "2A" it means "2 amp". Same thing "1A" is for "1 amp". I'm very ignorant with this kind of things.
My worry was because at the power cable plug it says "T1AL for 230v and T2AL for 115v" :/
Anyway thank you for your help and sorry for my bad english! lol
Great video! Am trying to replace my multimeter DC fuse but need your help. It is a glass fuse marked UL and Canadian Standards fuse. It has 'SHMF 51NM' on one cap while the other cap is marked 250v 0.315a - that's the easy part but am having difficulty deciphering the 'SHMF' part. Please help !!! Thank you. OBW - it's a 5 x 20mm fuse.
Sorry but I don't know what the "SHMF 51NM" stands for.
@@GrantsPassTVRepair Thanks for responding.
Have you seen a ceramic fuse in a microwave oven with a single stripe around the diameter at the middle of the fuse? Would that indicate slow-blow?
I wouldn't know what are stripe around the fuse means.
Thank you for a great video!
Great information, thank you!
Thanks for the information. But what I am trying to find out is if I can replace a slow blow fuse with a fast blow fuse? If yes what rating will I need (for the fast blow)?
You can replace a slow blow fuse with a fast blow fuse, but there is a good chance it will blow out even if the circuit it supplies power for is okay, It sounds like you're wanting to go with a higher capacity fast blow fuse to compensate for not using a slow blow fuse. I have not knowledge on how to calculate this.
@@GrantsPassTVRepair thanks for your reply.
Yes I am trying to replace a slow blow fuse with a fast blow fuse for a lighting circuit, periodically, until I can source a replacement (in this case it’s an emergency.) The 500mA fuse is to protect the contractor coil.
@@selfmade128 Selfmade I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe.
I got it in my about tab.
Hi what happen if you put a wrong amphere to a dvd or amplifier but the same voltage?
Your question isn't that clear.
Thanks you so much for the info.
why did it end so abruptly?
Camera issues.
is a normal blow fuse the same as a fast blow fuse? (don't know if its addressed in the vid..i haven't watched yet)
great video. thank you so much.
I've got 4 fuses in my cassette deck. 2-SS, 1-ST, and one with no markings. So I think three are slow blow; is it safe to assume that the fourth is slow?
I don't know, but I never like to assume anything.
Grants Pass TV Repair Thank you very much for your time 😀🌞
thanks for the info
Hi I have a fuse with symbol 12, F.20A/250VP. So do I have a fuse that can withstand 20A or 0.2A?
0.2 means 2 tenths of an amp or 200 milliamps.
Grants Pass TV Repair Thank you. Time to buy some new fuse.
Can fuses be wired "inline" to increase voltage/amps ?
If you have Two fuses in parallel it will increase their amperage capacity, but not in a series circuit, which is probably what you meant when you said "inline"
One of the symbols you saw is a BS Kitemark: en.wikipedia.org/wiki/Kitemark
Another mystery revealed. Thanks for the info :-)
oops! commented on wifes youtube account