Are Fuses from AliExpress and Amazon really dangerous? How to test yours!
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23 дні томуWhen I saw this video from Louis Rossmann or this one by Tom, a fellow HAM radio operator, I said to myself: Holy shit! I use these car fuses a lot, and I always expected that they protect my circuits from overcurrent and possible burning, but I never checked if they work. Particularly since I started to work with Lithium batteries capable of delivering huge currents and even burning if you are unlucky, the danger increased dramatically. Do I also have bad Chinese stuff? I am sure you want to know the truth, too. So, let’s check out my fuses from AliExpress and Amazon and compare them with the proper ones from Bosch. And I will show you how you can test yours without expensive gear.
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@AndreasSpiess 22 дні тому
For a 100% test: You measure the resistance of your first fuse using the 4-wire method. Then you do the test. If the fuse is ok, you can measure the resistance of all your other fuses and compare it without blowing them. The good ones should have a similar resistance.
@jamesmichener7526 22 дні тому
You would think that all fuses of a given rating and size should have a specific nominal resistance. We want more! (sorry to steal your line) How about measuring the resistance of the Bosch fuses, along with the standard deviation... to provide a reference. Then compare that to the Chinese twins
@AndreasSpiess 21 день тому
@@jamesmichener7526 They were very similar (I mentioned it briefly). The bad ones seem to have much lower resistances, a sign that they used high-value fuses and repackaged them.
@InssiAjaton 21 день тому
My concern is a bit different. I never use the automotive style fuses anywhere in my designs and also have not met them in any of my measuring instruments. But the 5 millimeters (or the 1/4 inch American) cylindrical ones are something I deal with. As well as some BIG powere electronics types. There I pay attention to their rated Interrupt Capability. I see a related number as the specified maximum Circuit Voltage. Even a reputable manufacturer of American fuses specifies their 15 to 30 A 1/4 inch fuses for use no more than 32 V, while their lower current fuses in the same housing is rated 125 V. That is based on their Interrupt Capability, which the lay people have minimal or no concept. I have chosen to avoid the “empty”, glass tube type fuses in general, at least for more than 1 or 2 A nominal rating. Instead I want to have the ceramic, sand filled ones, as they can interrupt much higher prospective short circuit currents, >200 A, rather than a few tens of amperes. Simply put, the internal sand quenches the arc when the fuse has to interrupt currents and VOLTAGES that could cause a continued arc and explosion of a plain fuse in a fault situation. The safety codes talk about fuse co-ordination and backup fuses even for breaker units. But enough said!
@Sylvan_dB 20 днів тому
@@InssiAjaton FWIW, this american uses two standard sizes of tubular glass fuses: 5mm X 20mm and 6.4mm X 25.4mm. The latter is a 1/4inch fuse. I've never seen a 5mm in higher than 32VDC while the 1/4in (6.4mm) are available up to 250VAC (in at least some amp ratings, as you noted). The D.C. vs. A.C. is important.
@Willy_Tepes 19 днів тому
What are your thoughts on Linear Array Solid State LiDAR Sensors? Does it bring anything useful in comparison to single beam?
@RogierYou 22 дні тому
I tested all my fuses and they blew according to spec, so I know they are good, put them back in the box for future use 😂
@AndreasSpiess 22 дні тому
:-))
@tonysheerness2427 22 дні тому
This is the problem you know the ones you tested worked, the untested ones are still dubious as the quality control shown by other you tubers can very.
@colinstamp9053 22 дні тому
Funnily enough, it is possible to test a fuse without blowing it. e.g. ukposts.info/have/v-deo/ipGEpJWjkGl2k4k.html
@ecospider5 22 дні тому
@colinstamp9053 Fantastic video. I learned a lot watching it. Really though my intuition of how things react was greatly increased. It was really cool to see the resistance being so linear to the current. Until it wasn’t 🤓
@ecospider5 22 дні тому
@colinstamp9053 To be more precise he was measuring the voltage drop across the fuse. So the voltage drop increased linearly to the current. Until it didn’t.
@AndrewDanne 22 дні тому
There is an Electronic Engineering joke about testing fuses! Yep that worked…. Yes that worked…. Yes that worked! Ah no more fuses :-)
@AndreasSpiess 22 дні тому
:-)) Indeed, without ordering a few more, I would have had exactly this problem...
@uiopuiop3472 14 днів тому
i will mayb buy 300 and test 250 and mean it out
@gg-gn3re 8 днів тому
@@uiopuiop3472 It's probably best if you buy a pack and test 1 or 2 of each rating and if they're good, that batch is probably good. The brand will change every few months so just know your specific batch is good when bought
@TomasNovotny-ep5br 6 днів тому
But what if the next one will be the bad one?😂
@uiopuiop3472 4 дні тому
@@TomasNovotny-ep5br that what the mean values protect from
@McTroyd 22 дні тому
I caught Louis' video the day he published it. As I'm a US citizen, I immediately reported the video to the US Consumer Product Safety Commission. Turns out, especially for a government agency, they are fairly responsive. In a couple business days I got an acknowledgement thanking me for the tip, and noted their Internet team is looking into claims like this. Good to hear my tax dollars are at work. Hopefully they are eventually able to put a dent in the supply of bad fuses like Louis found. That's a serious fire hazard.
@AndreasSpiess 22 дні тому
I agree that it is a danger. That is why I made the video… good to know they will disappear.
@realedna 19 днів тому
They're already at work to take down the video! ;-)
@michaelgleason4791 16 днів тому
Oh my sweet summer child.
@JaredConnell 15 днів тому
@@michaelgleason4791it's kinda cute actually, he thinks something will happen lol it must be nice to be so naive about the world
@urnoob5528 15 днів тому
there are so many dangerous and dubious products from china that aint stopping shit
@J-Eagan 21 день тому
We used to blow a lot of fuses as part of our FSAE team. To save money I ended up going to the junk yard and pulling good fuses from old cars. Lots of cars still have the OEM fuses in them so it’s a great source of high quality fuses for cheap.
@AndreasSpiess 21 день тому
Good idea!
@gorak9000 21 день тому
Or learn to use heat shrink, and you won't blow as many fuses in the first place
@dominik4205 18 днів тому
@@gorak9000 What does heat shrink have to do with circuit breakers?
@mekkertroniker2002 18 днів тому
Fuses also wear out, every part that carries current wear out.
@J-Eagan 18 днів тому
@@mekkertroniker2002 That could make for an interesting video. Testing old fuses to see how closely they match the original specs. I do agree it’s probably a bit easier to blow, but I’d rather have that over the cheap fuses that don’t blow.
@MicheIIePucca 22 дні тому
Just knowing the lack of quality that can come from Aliexpress, EBAY, and even Amazon, I stopped buying fuses from those sellers and started only getting brand name ones from digikey, mouser, or local stores that had a reputation. I also found AGC fuses from China to not be the same diameter and length as spec fuses, being slightly smaller on each dimension, which had me also concerned about quality. This is a great video for those who want to be safe.. thank you!
@AndreasSpiess 22 дні тому
As adults, we have to decide and carry the risk. But to do so, we need information. When I bought my assortments, I did not know about those problems (as many of the thousands of other buyers, I assume). Now at least a few people know...
@SnakebitSTI 22 дні тому
These days Amazon is selling the same products as you find on AliExpress and eBay. Don't buy anything important which might be counterfeit from Amazon.
@JuulCPH 19 днів тому
Yeah me too but I actually couldn't find an affordable brand name fuse kit for 5x20mm fuses that had a decent assortment of values and the two no-name kits I bought were completely unsafe.
@paulsengupta971 19 днів тому
I buy the AliExpress ones. I find they're a lot more resilient than the others...
@FranklySpeaking73 22 дні тому
Andreas, thanks for the video. Tell your wife how IMPORTANT your lab is to the rest of us!!!! Keep on going, my friend. 73!!
@AndreasSpiess 22 дні тому
Wilco!
@genomeyganomey6647 21 день тому
During my internship my mentor decided to showcase how the fuses blow, saving the system. However later we were astonished to see that the 10 amp fuse didn't blow at 25 amps! At that point, all the engineers came around and all started placing bets on when it would blow! 35 amps did the trick 😂
@AndreasSpiess 21 день тому
Different fuses seem to have different curves, particularly if motors are involved. 3.5 times more current would not be acceptable for a car fuse.
@tiagoferreira086 18 днів тому
That sounds dangerously funny lol
@kevinwalters5160 14 днів тому
There are different types of fuse, Stack Exchange has a discussion on slow blow vs fast acting.
@NinoJoel 14 днів тому
A regular fuse for home use that is rated at 16A often only blows below 80 amps. Everything below that needs time to heat it up enough.
@russellhltn1396 22 дні тому
6:33 - you might want to check the specs on your IR thermometer. That red laser is just an aiming aid. The actual measurement is being taken over an area considerably larger. The size depends on the model of thermometer and the distance. To get pinpoint accuracy, you probably need to upgrade to a IR camera so you can see what is getting hot.
@AndreasSpiess 22 дні тому
You are right. But I used my skin as a second „thermometer“. And it indicated no danger.
@bazzaar1869 14 днів тому
@@AndreasSpiess ah, the thermal imaging finger :) I've be using it for years!
@125brat 13 днів тому
@@bazzaar1869 In conjunction with the Mk1 Eyeball, most testing jobs are covered 😁
@TecSanento 22 дні тому
If you repair her stuff, she will stop questioning your expense’s;)
@AndreasSpiess 22 дні тому
Good advice!
@musiqtee 22 дні тому
Yep! That’s why her things always work - and mine always need repairs… (18 years and counting…🙏🪛💡🪫)
@KrisjanisZarins 12 днів тому
And then she will say to your daughter: Never marry an engineer, you will never have anything new, he will fix everything..
@farmerwoody123 22 дні тому
Fuses from reputable vendors have full sets of specifications within which they have to fall (e.g. time to blow at 110% rating, 150% etc.), and also voltage rating. The voltage rating is important, especially now vehicles with 48V+ are getting more common, as above this voltage the fuse is not gauranteed to provide full insulation once it has blown. Even the reputable brands start at 32V rating, and I wouldnt trust the no-name fuses without a spec sheet and the certification of their performance. The companies pushing these uncertified safety components should be held to account, as the saying goes "Safety standards are written in blood".
@AndreasSpiess 22 дні тому
I agree.
@125brat 13 днів тому
@@AndreasSpiess It is quite an eye-opener when you start to look into the technology behind fuses, as most people dismiss them as a simple piece of thin wire which burns out usually at an inconvenient time. I worked in technical support for one of the largest electrical distributors in the UK some years ago and learnt a hell of a lot about fuse types and rating etc from the older and wiser engineers about such an innocuous component. Specifications such as voltage rating (a.c. and d.c. rating) , breaking capacity, I^2t characteristics, temperature derating etc. are vitally important when specifying the correct fuse for a specific job and if you can't use a reliable fuse you're wasting your time and risking fire, explosion or worse. This problem of out-of-spec and even counterfeit fuses doesn't end with automotive fuses. I was involved with some counterfeit BS1362 fuses that were being sold by the UK's largest DIY sheds which were extremely dangerous. Samples of the fuses were tested at ERA Technology (One of the 2 UK certified test houses for BS1362 fuses who put the ASTA mark on them) with shocking results and a video showing one of the tests is here on UKposts: ukposts.info/have/v-deo/g4Z7iqmug5iiwnU.html By the way, fuses don't "Blow", they "operate" 😁
@ArielNMz 13 днів тому
>The companies pushing these uncertified safety components I'm pretty sure it's not "the companies" but people cheaping out on components
@rudycandu1633 22 дні тому
Using alligator clips for your test are not ideal. (unless that is what you use in the application) You should use good quality fuse clips soldered as normal. The fuse clips act as a heatsink for the fuse, cooling it and modifying the trip current. Now retired, I used to design equipment for an electronic manufacture. Some of our products included fuses. The fuse clips, and the pcb it was soldered to, were factors in the continuous current capability of the fuse. Of course ambient temperature mattered. For some products we had to use beryllium copper fuse clips because regular fuse clips would fail under high current (20 amp) long term load.
@AndreasSpiess 22 дні тому
I agree. However, my expectation was that the fuse blows below one second @10A. So I did not expect too much heat transfer in this test.
@hackswell 24 дні тому
I'm glad Andreas didn't get too angry and... blow a fuse. ;)
@AndreasSpiess 22 дні тому
:-))
@louwrentius 22 дні тому
Fuses are quite a huge topic with 48V DC Solar Battery setups (DIY setups). You have to look at the KA (kilo ampere) rating because lifepo4 batteries can cause huge short-circuit currents, which may sustain an arc (will result in a fire for sure).
@jeffschroeder4805 22 дні тому
fuses for extremely high amperage situations are in an entirely different class from those Andreas was testing. He seemed to be testing those we were likely to be using in our electronics or automotive projects. Channels that deal with solar power projects would be more likely to provide you the information you are searching for.
@AndreasSpiess 22 дні тому
Indeed, jeffschroeder is right. I use entirely different fuses for that purpose. And I am not equipped for testing them.
@tsbrownie 22 дні тому
Andreas, if you think those are dodgy, you should test the resetable version of those fuses!
@AndreasSpiess 22 дні тому
Another viewer suggested also resettable fuses. But they seem to be quite expensive (>10$ each)
@tsbrownie 21 день тому
@@AndreasSpiess If you google "resetable blade fuse for car" you can find them from less than $2 USD up. I did some rough tests and they are slow and not very accurate. I know you're busy, but you might do a lot of people a favor by reviewing them.
@BerndFelsche 22 дні тому
Fuses in engine compartments ought to be de-rated as they are preheated by about 50°C. They will blow sooner, if they don't fail due to mechanical vibration. The latter being a diagnostic nightmare if the break is intermittent.
@AndreasSpiess 22 дні тому
Indeed, the environment. In a car is hard. Particularly in hot or humid countries. This is why I always have a spare fuse with me…
@mac0pod 22 дні тому
Fuses also have other important aspects of specifications. This includes ensuring that they do not explode, that they are able to extinguish the arc, etc. These are not elements that are replaced every day. I also believe that it is definitely not worth saving on them - because they usually protect much more expensive elements, and sometimes it is for safety reasons.
@ecospider5 22 дні тому
I have built some 60v battery packs. I decided using these spade fuses are a bad idea since they might arc for a long time after blowing.
@TheEmbeddedHobbyist 22 дні тому
@@ecospider5 High current current can be a real pain in the ass for fuses, as if the arc gap is not big enough they just arc over and the current stays flowing until something burns out. May be a magnet can be placed next to the fuse to drag the arc away from the contacts to increase the arc gap and extinguish the flame. in the same way they do with high power DC relays.
@danga55gan 22 дні тому
true In Zimbabwe, there is no smorgasbord of variety, only cheap ones
@mrfrenzy. 22 дні тому
@ecospider5 that's because these fuses are rated for 32V (24V nominal). 6.3mm and especially 10mm ceramic fuses are a very good and cheap option for higher DC voltages.
@ecospider5 20 днів тому
@@mrfrenzy. Thanks for the search terms. I really don’t like the fuse holder options for those. But when I just searched for them I found some with leads soldered to both ends. That’s kind of perfect for the type of projects I do. So thanks for that.
@gedgicat2063 22 дні тому
Great video, glad your fuses from AliExpress worked ok, as I've recently purchased a similar power distribution board from there. Will be looking at the fuses received to double check 👏👏👍
@AndreasSpiess 22 дні тому
I hope they are ok!
@paulcohen1555 22 дні тому
Not surprised about AliExpress products quality. Everyone who encounters bad sellers or products should report that and give negative feedback. That will help everyone.
@AndreasSpiess 22 дні тому
That is what I do. And dispute also small amounts. Only if it hurts it will change ;-)
@FlnSkr 18 днів тому
the problem is that lately, we are getting worst products on Amazon than on Aliexpress.
@mvadu 22 дні тому
This is very approachable test method! Thank you for the guidance
@AndreasSpiess 21 день тому
You're welcome!
@qchatgreg 22 дні тому
as always - informative, educational and well presented.
@AndreasSpiess 22 дні тому
Glad you think so!
@MeanderistHandle 22 дні тому
I just did some quick tests on my cheap generic assortment from ali. Most were at least in the 'okay-ish' range like Andreas' (breaking in a couple of seconds at 2x the rated current) but I got one 3A fuse (out of a total of 9 3A fuses tested) that withstood at least 3 minutes at 6A. I'm definitely gonna get myself some more reputable ones.
@AndreasSpiess 22 дні тому
Thank you for sharing your results. Good decision!
@marcusone1 21 день тому
Why I wouldn't rely on Andreas method. If one blows on spec, doesn't mean the all will. I was like you and tested a number of them in a pack I had from Amazon. Some blew regular, some slow, some went for minutes before i gave up/ran out of amps. So I just tossed all Alliexpress/Amamzon fuse and order a whole bunch from Digikey.
@birdybirdy688 22 дні тому
thanks Andreas, very helpful video. time to test my fuses too.
@AndreasSpiess 22 дні тому
Good idea!
@jmr 20 днів тому
I appreciate the information. I plan to test a few when I get a chance.
@AndreasSpiess 20 днів тому
Good luck!
@Boz1211111 7 годин тому
Thank you so mu h for the test really answers my questions!
@beniaeschbach2626 18 днів тому
Thanks Andreas, great as usual. One could use a car battery as power source - plenty of juice in there, and saves your 'precious ' 18650 gear from abuse.
@AndreasSpiess 17 днів тому
I agree. Just change the resistor.
@douglasheld 16 днів тому
Thanks for the excellent work!
@AndreasSpiess 14 днів тому
My pleasure!
@arpcatchall822 22 дні тому
Next time wife tells you to get rid of your stuff, tell her you'd do it as soon as she gets rid of her shoes! 🤣
@AndreasSpiess 21 день тому
:-))
@Bean-Time 11 днів тому
This is a good reason to use breakers. More expensive but SUPER easy to test
@AndreasSpiess 11 днів тому
Agreed if you have the space.
@glenmartin2437 17 днів тому
Thank you, Andreas. Keep up the good videos.
@AndreasSpiess 17 днів тому
You are welcome!
@MikeKasprzak 19 днів тому
Thank you Andreas for the PSA.
@AndreasSpiess 17 днів тому
My pleasure!
@yancymuu4977 22 дні тому
I believe there is another very important specification that should be tested for high current lithium battery systems. I note that the fuse spec shown in video has a short circuit breaking current of 1000 amps at 32v max. Some fuses (particularly in DC circuits) can create an arcing situation even after the fuse burn out that keeps the current flowing. To test this, one needs to short the full voltage of the battery system through the fuse with high current operational wiring. This is a dangerous test and one should have standby cable cutters. I used only the current stunt resistor in this test which will also be in the operational system (and also can be connected to an oscilloscope for current measurements). With a 29 volt battery the different fuse types would typically blow between 1000 and 2000 amps. For higher voltage battery systems the fuses tested in the video should not be used. Special fuses filled with sand for arc suppression are needed. Thanks for your great videos.
@AndreasSpiess 22 дні тому
As a builder of a 7kW Lifepo4 battery, I agree. They are very strong and you have to pay attention. However, I use different fuses there, not 5A car fuses…
@antonioperezseron 22 дні тому
Thanks for your educational vidéos. ❤
@AndreasSpiess 22 дні тому
My pleasure!
@thisisyourcaptainspeaking2259 17 днів тому
I discovered a blown 5A tail light fuse in my vehicle and all I had as a replacement was a Chinese fuse. Great point, I'll be testing these fuses.
@AndreasSpiess 17 днів тому
Good idea!
@narancs5 4 дні тому
Great knowledge. I had no clue I should be worried about fuses being crap quality. For testing automotive fuses car batteries are probably the simplest choice because you will definitely own one if you need fuses for a car. You need to adjust the amount of resistors/resistance you put in, though. Car batteries are easily capable of multiple hundred amps output.
@AndreasSpiess 10 годин тому
Also a good idea. My car is parked far from my lab, so I went this way.
@so4706 22 дні тому
in my e-scooter (german brand) once a fuse burned (25A). It has burned because they didn’t installed it probably. one leg was displaced. the fuse and holder were isolated with kapton tape. i replaced the holder with one of the “water proof” black once you showed in your video. I may install a temp. measurement circuit with a buzzer :) Thanks for your effort the idea to measure the time with your scope is intelligent. Danke Peter
@AndreasSpiess 22 дні тому
Check if these "waterproof" holders have thick wires for 25A (mine do not have it).
@so4706 21 день тому
Thanks, yes they are from Hella and rated for 30A fuses - i measured around 3.5mm2. the wires to the batteries seems to have slidly less then 4mm2.
@Bean-Time 11 днів тому
I was gonna say that LiFePO4 is not pronounced 'life eppo 4' but honestly i love your mini mispronunciations
@nkronert 18 днів тому
The sound at 8:52 got me to frantically search for a short circuit in my surroundings 😊
@AndreasSpiess 17 днів тому
:-))
@haajee1 2 дні тому
Good video and very informative! I will check my fuses also. But good to see that there is al lot of panic about bad fuses what is not correct. I also have a assortment glass fuses. :) So you advise is to use a resistor of 3-Ohm and at least 10 watt?
@AndreasSpiess 10 годин тому
The resistor value and its wattage has to be calculated with the voltage you use (Ohms law).
@daveys 22 дні тому
Great video as always Andreas! Some dubious QA going on at these Chinese suppliers. It’s a race to the bottom, who can make the fuses for the lowest cost.
@AndreasSpiess 22 дні тому
It seems so. And it is dangerous if you do not know.
@daveys 22 дні тому
@@AndreasSpiess - What worries me is that the whole supply chain has been corrupted. These bad products mean that trust in all the products drops. I’d maybe say “OK, well just choose the Bosch branded ones” but there are instances of fake branded fuses in the supply chain too. Your suggestion of testing just one 5A fuse upon receipt of the pack and rejecting if not performing to spec is a good one. Luckily I have all the kit to do the testing without needing to short out a Li battery…although having shorted the mains a few times, maybe shorting the battery is safer! (I’ve also been in the room when a pack of Lithium cells blew up and still remember the smell 20yrs on!)
@mrtechie6810 18 днів тому
I bought a whole bunch of fuses for my UPS battery cells, only to discover that the max voltage is only 32V and they are low interrupt current. Now I am in the market for a Class T / high interrupt rating 60V fuse.
@AndreasSpiess 17 днів тому
Indeed, the voltage rating is also essential for some applications. For car batteries, it is usually 24V only.
@pedrorela8696 21 день тому
Andreas, thanks for the video! Can you do another one comparing the "normal fuse" with the "PTC" fuse? @Greatscott has done one fast video about that, but you are more technical. I'd like to implement PTC in my projects but the Trip current and Trip time for greater currents make me nervous to use it, if we compare it with a normal fuse. Example: PTC with 7A holding current will trip only with 14A and the trip time is 2s... Can I use this PTC rated for 7A (Littelfuse 2920L700/24SLER) with 8 or 9A? Thank you for your videos!!!
@AndreasSpiess 20 днів тому
PTC resistors are not fuses, they are resistors that change its value with heating. They have a different purpose.
@allangibson8494 12 днів тому
All fuses have a time current curve (and so do circuit breakers). Circuit breakers will trip EVENTUALLY at rated current - which is why they provide superior protection. Blade fuse replacement circuit breakers are available if protection rating is critical. Circuit breaker’s typically drop 1V at the rated current (which can be important at low voltages).
@AndreasSpiess 11 днів тому
Thank you for the additional info!
@BenMitro 22 дні тому
Nice experimental setup for these 5A and 10A fuses. My question is about larger fuses from ebay/aliexpress etc. how to test a 100A or 150A ANL fuses for example?
@AndreasSpiess 22 дні тому
I have no clue because I am a low voltage/low current guy ;-)
@EgonSorensen 22 дні тому
I've never done it, but I would use a new car battery (12V, 400-600-800 ColdCrankingAmps) recharged a day or 2 ago, left to settle. Then I would take some thick copper wire, of which I know the diameter and length - and calculate Ohm/meter. Now I have a power source, a current limiting wire/resistor - which I adjust to the number of amps I need to flow in the circuit. A scope across to verify various parameters :ø) I would also test on some resettable fuses first, and likely incorporate some kind of mechanical/electrical switching to be as safe as possible
@GuidoAmbar 22 дні тому
Probably with a good inverter welder. They reach over 100 Amps and I think they should be at least 10% accurate. They have short circuit protection, so you would have to be performing the welding arc. It is also quite safe (no high voltage).
@BenMitro 22 дні тому
@@GuidoAmbar Nice idea, thanks Guido.
@BenMitro 22 дні тому
@@AndreasSpiess You mean a low power guy :)
@enzofraschini7117 22 дні тому
the graph tells "average melt"! any additional info in the spec about the scatter? I would want such info from such an expensive piece of "paper". It reminds me how we are made to be scared when there is any temperature anomaly wrt the "norm".
@AndreasSpiess 22 дні тому
I did not check. But the datasheets are public ( not the norm papers)
@wherami 22 дні тому
Wonderful information
@AndreasSpiess 22 дні тому
:-)
@TimoWitte 17 днів тому
I guess the future will be active fuses like tesla does in cars! It´s just a FET instead of a fuse and a current measurement shunt and a comperator which kills the gate voltage to the FET.. + an PWM from an IC + a small capacitor to generate the voltage to compare to! You can implement "intelligent" fuses that way, which for example have different current limits and trigger characteristics depending on operating state of the connected circuit, you can switch on/off circuits from your IC that way, thereby integrating "fuse" functionality and control (on/off) in one function.
@AndreasSpiess 14 днів тому
Well possible. Most relay are also replaced by transistors and SSRs.
@markoverton5858 22 дні тому
Thank u for this heads up, will be testing my selection boxes, 👍👏
@AndreasSpiess 22 дні тому
Hope they will be ok...
@nargalda773 22 дні тому
test all fuses, just to be sure
@BeefIngot 22 дні тому
Perhaps ICs like TPS2553D could serve as better overcurrent protection as they also do a lot of other things, handle typical amperage ranges, and you could even just make a little breakout board with a pot to set the range.
@mrfrenzy. 22 дні тому
If you really know what you are doing or are making a commercial device this is a really good solution, however it's easy to make a mistake in construction. Regular fuses are foolproof.
@AndreasSpiess 22 дні тому
Good idea for low current devices (
@BeefIngot 22 дні тому
@@mrfrenzy. Im not sure its all that complicated. The datasheet has a full schematic, and its a simple calculation to set the fuse current via resistors. You can also test it just as easily as fuses and still use it after.
@inotoff 22 дні тому
And what happens the day your IC fails and shorts the power line ? That's why we use fuses. They are passive and can not create shorts.
@BeefIngot 22 дні тому
@@inotoff What happens when it fails? A meteor hits and magic pixies escape from the rocks we stored them in. That is to say, with what evidence do you so proudly claim fuses to have higher reliability than this ic in countless products without any recalls or failiures noted? Anecdotes and uncle jimbobs rules of thumb? You think your smartphone uses big car fuses instead of efficient multi purpose ics? why stay in the past? Dont let a lack of knowledge and discomfort limit capability.
@Chris-ut6eq 22 дні тому
Good video, as always! Bosch fuse cost vs amazon, 2x? 5x? 10x more expensive? Also, without quality control there way to be sure each fuse will perform to any spec. For low amp protection untested fuses like this are probably ok. Like you I use the cheap fuses and my only defensive strategy is to overspec the wires to help mitigate the unknown fuse quality for low amp protection. For high amp, is the cost difference really worth the piece of mind using a reputable brand?
@AndreasSpiess 22 дні тому
Bosch: 11 Fuses for 5$ on Amazon No Brand: 80 fuses for 8$
@Chris-om7xc 18 днів тому
Dear Andreas Can you find a way to use bricked Gigaset elements products with another DECT bridge, like Fritzbox? AVM sensors seem identical to the old elements. Thanks and BR
@AndreasSpiess 17 днів тому
I do not know anything about the products you mention :-(
@davideyres955 14 днів тому
@@AndreasSpiessgigaset are phones and the Fritzbox is an adsl router with a dect gateway, so it should be able to connect the handsets to the router as it has a POTS interface in it. Thanks for your video’s Andreas. Edit: tell a lie Gigaset elements is an alarm system so the talk of sensors makes more sense. It may work over dect.
@MarioRiesebeek 22 дні тому
Tested a couple of chines 5 amp fuses. 1 brand dit not blow at 15 amp even after a minute or so! Thx
@AndreasSpiess 22 дні тому
Thank you for sharing your results. Definitively time for a change…
@BerendvanBerkum0 18 днів тому
Oh, so they exist. Interesting. I had one of those 300pcs assorti kits and like you had been giving them away as well, but after seeing the video by the ham radio guy I tested them using a 5A car battery charger. I could not get any of the 5A, 3A or even 2A fuses to blow. So... I had to try and retrieve the fuses I gave away, and I put them all in a bag for further experiments. Unfortunately I cant test the large current fuses. But I will never trust unknown fuses again unless I know exactly where they came from. (And probably test 1 or 2 of the lower range types using a charger).
@AndreasSpiess 17 днів тому
Your "call back" was a good idea!
@matambale 16 днів тому
Thank you, Andreas.
@AndreasSpiess 14 днів тому
My pleasure!
@Jawst 12 днів тому
These have been around for a very long time lol I remember when I first came across them in a melted the fuse box. I prefer glass fuses for home projects
@AndreasSpiess 12 днів тому
I also often use glas fuses. But for cars and motorcycles, I use these.
@panospapadimitriou3498 18 днів тому
i find some blown fuses when try to charge a lifepo4 pack ... and it seemed that precharging something was the reasson.. i still use that specific amps fuse for the cables and hope i forgot the dc converter at low rate of amps.......!!!
@AndreasSpiess 17 днів тому
LiFepO4 batteries are very strong and easily blow fuses...
@AJB2K3 21 день тому
Do you know if the slow blow fuses were sold as actual slow blow? There is such a thing as a slow blow fuse when circuits are prone to initial startup surges.
@AndreasSpiess 21 день тому
I did not find datasheets for slow car fuses. It seems that one size fits all.
@jamess1787 22 дні тому
I lucked out, only bought 1 pack years ago, tested the samples that I had the ability to test: they blew around their rating (which was twice what I needed in that circuit)
@AndreasSpiess 22 дні тому
Thank you for sharing your results!
@salan3 22 дні тому
Fuses are a total minefield. We used to have to carry US, UK, CE rated fuse as they all had different spec. for example the 'slow blow' US fuses could not be replaced with a UK slow Blow of the same rating as they were specc'd differently. So we would need to put a far higher UK rated fuse in to stop it blowing with the surge. To the point the cct board could go up in flames with constant current! A total pain. Also in the UK the fuse in the plug is NOT there to protect the device but only to protect the cable (flex). yet people still often just leave a 13A fuse in the plug when it is connected to a 5A flex (they make 1,2,3,5,7,10 and 13A fuses) Also if I remember correctly (going back too many years since I did the course) For a fuse to be in spec (13A plug fuses) if you had 1.5 times overload then the fuse must blow within 4HOURS!! (they are designed for shorts). So if you had a10A fuse then you could pull 15A through it for 3 hours 59 mins and then it blew the fuse was in spec. You were long dead mind lol.
@AndreasSpiess 22 дні тому
Thank you for sharing your experience. I am no expert at all. But I found that it is good to know that there are issues and how to at least check if you are in big danger.
@salan3 22 дні тому
@@AndreasSpiess The reason for the plug fuse in the UK is because the mains sockets are on a 'ring main' with 32A MCB's. EU generally has individual feed to sockets.
@TheEmbeddedHobbyist 22 дні тому
the point about protecting the wiring is spot on. No fuse will be fast enough to protect the electronic equipment. Normally you pick the wiring to cope with the power demand and then pick the fuse to protect the wiring.
@Bean-Time 11 днів тому
Also if you have access to a datasheet there are 2 important numbers. Theres a must blow curve and a must not blow curve. Just because your results differ from the value on the label doesn't necessarily make it out of spec or illegal unless they provide a standard (like ISO 18894 or whatever it was) or a datasheet.
@AndreasSpiess 11 днів тому
I thought that these values are included in the curves (forever to blow=must not blow)
@adamcarson1516 18 днів тому
I found this with some fuses I purchased from Aliexpress about a year ago, they were all exaclty the same fuse/ the internal wires were all the same thickness ( which is why i did the test in the first place ). I could not actually blow one (safely). To conduct my tests I used a 12v car battery and a 12v dc to 240v ac inverter, with the fuse placed in the 12v circuit. I then placed increasing loads on the inverter whilst monitoring the current with a clamp meter. From memorty a 5a fuse refued to blow at around 30a.
@AndreasSpiess 17 днів тому
So you definitively bought off the bad ones! Good that you know now.
@rasimbot 16 днів тому
Voltage may be important in terms of dynamic processes during blowing
@AndreasSpiess 14 днів тому
For fuses in general, you are right. To sort out the fakes, probably not. Keep also in mind that these fuses are used at 12 and 24V.
@oliverer3 14 днів тому
I've been using a lot of eFuses in my designs recently and while this wasn't among the reasons why I'll add it to the list. :D
@AndreasSpiess 14 днів тому
They do not suffer from these problems, I assume...
@oliverer3 14 днів тому
@@AndreasSpiess Being digital you basically have perfect control of their characteristics, they of course have other draw backs such as price and maximum voltage capabilities but they're great when you want a high level of control and something resettable.
@dzee9481 19 днів тому
Andreas excellent video, this was not expected, like you mentioned about TRUST, well global manufacturing does not have any type of regulation, unless the product made in another country perform the test under the regulations provided by the company to meet their requirements. I typically by may electronics these days on Amazon, I went back to test the 1A, 5A, and 10A fuses. I was wondering why my old car was frying some electronics in dash and never thought it as the fuses. When I saw this video I took the fuse that I replaced it was a 1A found that it did not blow at the expected amperage. Therefore, caused me to buy the electronics for the dash board that supports the dash instruments. I had an auto start system put in which allowed me to start my vehicle using a key fob, the tech added this to a circuit tapped from that fuse element, well from your test now we know what and why. I wonder if the glass tube fuse fall under the same demise?
@AndreasSpiess 17 днів тому
I mainly use glass fuses in my multimeter. So far, they have blown before the instrument was damaged, but I have not tested it.
@burnedupsparkytipsandrevie9597 20 днів тому
This in theory is what we do for breaker testing. How ever i would really recommend testing your instantaneous (short circuit) trip curve since a short is where you'll have the highest amp draw and if it doesn't open fast enough the current exponentially rises
@AndreasSpiess 20 днів тому
Also a goo thing. I just wanted to sort the bad ones out.
@eberger02 21 день тому
What devices are you making in which another component would not blow up without the fuse. I normally install them to protect the PCB only. All Plugs in U.K. must have fuses that meet the standards and there is also a fuse box backup. I guess this is mostly about battery powered stuff? Although I haven’t yet thought of a PCB that wouldn’t die. I guess the thinking is of voltage regulators blowing and in doing so short circuiting, but then wouldn’t the battery wires and PCB traces blow?
@AndreasSpiess 21 день тому
These car fuses are for low voltage only. This is where I use them (for example on my Harley)
@ifell3 22 дні тому
Great video!!
@AndreasSpiess 22 дні тому
Glad you enjoyed it!
@abdelhakimallal3753 18 днів тому
Strange, this never occurred to me even though i had never trusted cheap products, Thanks Andreas for the video
@AndreasSpiess 17 днів тому
Increasing the price (as many resellers do) does not make a product better ;-)
@olafschermann1592 20 днів тому
When do fuses get warm? At or near spec? I am asking because of paralleling solar modules. To prevent backflow of current thru a bad module which can lead to fire you can either use diodes (which get warm because of the voltage drop ) or fuses. If a solar panel is rated to 12A and i fuse it by 15A, does the fuse get warm during 12 hours of 12A load? Or do they keep cool even at 15A for hours?
@AndreasSpiess 20 днів тому
AFAIK all current panels have built-in diodes to protect the cells from overheating. They take the current if a part is covered. BTW: These are not fuses for solar panels because most panels I know have an output voltage of more than 40V. As I showed. mine did not get very warm at the rated amperage.
@thiloreichelt4199 20 днів тому
Current panels generally come with diodes to prevent the one panel in the chain being in the shade for 15 minutes being driven "backwards" (and signaling its indignation by smoke).
@sebastian19745 21 день тому
At 7:50, the fuse you showed was brown, that, according to the color codes mean that it was rated to 7.5A and according to the chart you showed a bit later, seems to be totally in specs (I see that the time at when the fuse blow is below the curve). Am I wrong? Correct me please. Interresting topic, I never doubted a fuse, now makes me think about them.
@AndreasSpiess 21 день тому
I later discovered that the Bosch 5A did not comply with the color schema of the others. It was a 5A fuse (and you are a very good watcher!)
@sebastian19745 21 день тому
@@AndreasSpiess Thanks. I have seen fuses that colors are off, enough that one have to read the value to be sure.
@bastiannenke9613 22 дні тому
When im Honest, i always was under the impression thst those fuses can't be fucked up while making them because they're just stamped parts that have a known/ calculated size. Expected the accuracy to be higher than on other cheao products. I started to use ABB S200 Breakers for projects where the size is not important a while ago due to the convenience when there is already a DIN rail. But all my small projects use 5x20mm fuses from random sources. Wonder if they have similar quality issues. Since the Fuses Blow from "overheating" of the small section, i wonder how much the results are affected by the temperature of the room they're in.
@AndreasSpiess 22 дні тому
They look nice! As you write: If you have enough space, a good solution. The car fuses also have a temperature curve and you are right, they blow at different currents at higher temperatures.
@bastiannenke9613 22 дні тому
@@AndreasSpiess took me a eternity to find Din Rail mountable Breakers that are approved for 12/24V DC. I like Din Rails because of the modularity. Also looks more professional and you usually don't have conductive parts that are exposed. Upgrades and Maintenance are neat with those. Since they can turn off 6000A (or more), I'd expect them to last a long time. (Which is a reason why I bought some used from renovation projects)
@AndreasSpiess 22 дні тому
@@bastiannenke9613 I use such a DIN rail for my solar plant at our remote radio station. But there, we have to handle higher currents (the highest is the coffee machine at 60A/24V)
@bastiannenke9613 22 дні тому
@@AndreasSpiess I'd probably use a lower power coffeemaker at 24V. True, din rail stuff is great for high currents. Depending on how remote that station is, it's also great that a lot of the Breaker manufacturers have remote control options. Or as a really expensive bistable Relais ;)
@AndreasSpiess 21 день тому
@@bastiannenke9613 The coffeemaker is standard 220V ( on an inverter). It consumes around 1.3kW... I do the monitoring of the entire battery with an ESP8266 and MQTT.
@richardjones38 17 днів тому
I had a customer have a wire melt in a correctly fused automotive harness years ago. The fuse was unbranded junk from Amazon. He had more, so I tested a couple. They were way outside spec. You can't go wring with Littelfuse, MTA, or other OEM brand fuses if you care about the application.
@AndreasSpiess 17 днів тому
Thank you for sharing your experience. I agree with the brands you mentioned. For the rest, you have to be careful.
@Poult100 22 дні тому
I was dealing with this very problem this morning! BTW, your wife is just like my wife, but my workshop is even smaller than yours. We live on a boat!
@uranoxyd 22 дні тому
That could be a good excuse to have every device twice ... for "load balancing" :)
@AndreasSpiess 22 дні тому
Which problem? Wife or fuses ;-)
@Poult100 22 дні тому
@@AndreasSpiess Haha! Both, I suppose, but I was referring to each in equal quantities. 😆
@saxpert 16 днів тому
Schönes Video Andreas. Müsste man nicht auch mit einem Motorregler von einem RC Auto oder Flugzeug diese Ströme rel genau regeln können? Ich meine dass meine Regler am Akku bis 40 oder 60A gehen. VG
@AndreasSpiess 14 днів тому
Ja, du kannst jede Stromquelle dafür nehmen. Ich habe etwas vorgeschlagen was in vielen Haushalten rumliegt. Einfach den Widerstand neu berechnen.
@klassichd10 22 дні тому
Thank you for the tests and your effort publishing it. You had good luck. Of course, we know Slovenia. It's inhabitant have a higher median wealth per adult than Germany (en wikipedia "List of countries by wealth per adult")
@AndreasSpiess 22 дні тому
Good info (I did not know that fact). The remark was more for the guys that sometimes mix Switzerland with Sweden ;-)
@john-r-edge 22 дні тому
@@AndreasSpiess Famous Slovenians (a mixture here): Philosopher Slavoz Zizek, Pro cyclists Tadej Podacar and Primos Roglic, and also Melania, wife of Trump - cannot expect all of them to be good guys and girls.
@shanent5793 22 дні тому
@@john-r-edge Žižek is an idiot but that doesn't make him a malefactor
@ats89117 15 днів тому
Did you consider using a large supercapacitor as an energy source rather than a lithium battery? If you used a 3V 350F 3 mohm capacitor, the voltage droop calculated from I = C dv/dt should be reasonably small, but the lower energy density of the capacitor is less likely to start a fire...
@AndreasSpiess 14 днів тому
Unfortunately, I do not have such a super cap handy (as most of my viewers). Also pay attention: Super caps have an exponential voltage curve that results in a variable current. Maybe not what you want for this test (unless you use a really big cap).
@retrofitter 11 днів тому
A Modern electronic stick welder would make an excellent adjustable current source, or a car battery with halogen head lamps
@AndreasSpiess 11 днів тому
Good idea!
@RS-ls7mm 15 днів тому
For a while there was an epidemic of practical jokes involving fuses at work. People became hesitant to turn things on for fear of the flash. Some fuses made very spectacular flashes.
@AndreasSpiess 14 днів тому
Mine unfortunately not. Not enough energy involved...
@RS-ls7mm 14 днів тому
@@AndreasSpiess You might be amazed what happens when you put 120V or 240V AC across a normal fuse. Will light up the room.
@oilybrakes 22 дні тому
Already did such tests on my chinese assortment. I can produce 8A with my Power Supply and neither the 2A nor the 5A fuses blew.
@AndreasSpiess 22 дні тому
Thank you for sharing your results!
@quintrapnell3605 6 днів тому
That’s a relief I was worried for you.
@AndreasSpiess 6 днів тому
Indeed, I was happy to see the results, too.
@AkosLukacs42 16 днів тому
But should we take the risk at all with a part that is really just small fractions of the device it is protecting? Especially considering the fire hazard, shipping time, etc?
@AndreasSpiess 14 днів тому
This video is for people like me who already purchased and use these fuses. All others can decide which risk they want to take.
@ruben_balea 22 дні тому
Blade fuses use the same colors for the same amperages only from Micro to Midi sizes, for Maxi sizes they reuse some colors for much higher amperages but that's not a problem because a Maxi fuse won't fit on any smaller fuse holder. *Warning: Many manufacturers use the same color or a very closer one for two or more amperages* 5A "amber" fuses can actually be brown, amber or orange. 7.5A "brown" fuses can actually be brown or dark red. 10A "red" fuses can be any shade of red. 40A "orange" fuses can actually be brown, amber or orange. Maxi 35A "brown" fuses can actually be brown or dark red. Maxi 70A "amber" fuses can actually be brown, amber or orange. Continental/Torpedo fuses *use another color code* that is almost the opposite, colors that are for lower amperages on blade fuses are for higher amperages on continental fuses.
@AndreasSpiess 22 дні тому
Good info. I did not know that. Thank you!
@geoffvdw 18 днів тому
My spare time is too precious to test each batch of fuses I buy from junk marketplaces. I just buy my fuses from reputable sources.
@AndreasSpiess 17 днів тому
Good point!
@johna8509 19 днів тому
I had one of these cheap unbranded fuses in my car. One day I found the inside of my car full of smoke. There had been a short circuit due to me installing a radio too far back which shorted the wiring loom behind it. When the fuse blew it kind of melted into a blob which shorted out both sides of the fuse and turned into a great conductor. I have never used a cheap fuse ever since.
@AndreasSpiess 17 днів тому
That was really bad luck!
@TecSanento 22 дні тому
Are there any resettable car fuse’s?
@AndreasSpiess 22 дні тому
Yes. Another commenter mentioned them. However, they are not cheap (>10$)
@siberx4 21 день тому
It's possible your batch that's taking a few seconds are "slow blow" types (while the others are standard or fast-blow) that are designed to tolerate brief overcurrent spikes. These are a perfectly normal/reasonable fuse design depending on the application, but of course you don't know what kind you get when you buy unbranded or badly labeled stuff from Amazon or Aliexpress.
@AndreasSpiess 21 день тому
Maybe you are right. However, I did not find specifications for "slow" car fuses, only the ones I showed.
@manu808 22 дні тому
Thanks!
@AndreasSpiess 22 дні тому
My pleasure!
@daddy6249 19 днів тому
Could you use a 12 volt car battery ? They could produce 200 to 500 amps without the battery overheating.
@AndreasSpiess 17 днів тому
Yes. Just recalculate the resistor value.
@ivekuukkeli2156 22 дні тому
Any not-blowing fuse at the rated A-value (+10%) is a fire danger. Blowing is by metal melting temperature as seen in the video as a flash. But not-blowing A-value overpassed means increased temperature and thus a (small) fire possibility.
@AndreasSpiess 22 дні тому
I agree.
@stevejagger8602 22 дні тому
This is why professionally sourced parts cost more. Also if you working as a professional in the electrical industry in Europe every part you use has to be traceable. So Amazon and AliExpress parts do not comply with this requirement. Like it or not it is the reason behind approved standards. For myself when I worked in the UK as a registered electrician BS 7671 Wiring Regulations is the standard I used as guidance, and every part I used had its own relevant standard that it had to comply with. In the end you get what you pay for.
@AndreasSpiess 22 дні тому
I agree.
@thisnthat3530 12 годин тому
The max breaking current should also be tested to see if the cheap fuses explode in flames rather than just blow. A shorted automotive battery can push several thousand amps through a fuse.
@AndreasSpiess 11 годин тому
Unfortunately, I do not have the means to do that. But for these small value fuses they have a far too high resistance even when working to allow such high currents.
@peppigue 21 день тому
i also used to think bosch meant quality, but had a bad experience with their wipers on my vw caddy
@AndreasSpiess 21 день тому
Bad luck, I think.
@JCWren 20 днів тому
Someone who's more motivated that I am could come up with an inexpensive fuse qualifier. You won't be able to test all the parameters, but as far as current and time you could. Use an ESP32, OLED display, a high current FET, and the other miscellaneous bits. Program it with a set of nominal fuse curves, user interface to specify the amperage and any other interesting parameters, then start the test. If the fuse doesn't blow after some point, the processor can kill power to it. It'd be a pretty good basic entry level project for someone.
@AndreasSpiess 20 днів тому
Go for it!
@edkretchmer2167 16 днів тому
Spend the few extra bucks and get "name brand" fuses from a known LEGITIMATE retailer. A few years ago, fuses from Harbor Freight were recalled for not meeting spec.
@AndreasSpiess 14 днів тому
I agree. But if you have them and used them and did not know about the problem?
@kevinwalters5160 14 днів тому
Product recall is a subtle feature of a good manufacturer, retailer and regulatory environment. I had some CR2032 batteries recalled by Amazon. These were sold by Amazon and not from Amazon marketplace. In this case it was due to concerns about the baby safe packaging. That was funny because the low brand batteries don't even bother with that!
@Enigma758 22 дні тому
But I read that some auto fuses are intentionally "slow blow" to account for inrush current from motors such as power windows and wipers so that muddies the water a bit.
@AndreasSpiess 22 дні тому
Maybe. I just did not find specifications for slow blow car fuses.
@Enigma758 22 дні тому
@@AndreasSpiess Well it could just be that they size the fuse accordingly in that case so that the inrush is within 2x of the fuse rating. A quick search indicates 15A for a wiper motor which seems sufficient.
@Alpine_flo92002 22 дні тому
The problem with power supplies and cheap electronic loads is that they often pulse their outputs and inputs. And for some really bad supplies that might actually cause lower average current flow than reported
@AndreasSpiess 22 дні тому
I would not consider my load as „ cheap“ ;-). But I have to check my cheap battery tester if it behaves as you describe.
@Alpine_flo92002 22 дні тому
@@AndreasSpiess I didnt mean your load in particular. Just in general. Tho I have some quite expensive equipment that does its job very well until that very specific use case where its worse than literally everything else. Tho for electronic loads I only got a cheapo and that think loves to resonate. With one of my PSUs the PSU and Electronic load just bounce around with the voltage.
@abeditani8293 15 днів тому
3:58 . Yeah, I know what you mean. we are in the same loophole of this as she say:( give them away if you do not use them always ) 🤣🤣
@AndreasSpiess 14 днів тому
:-))
@dianeattaway8733 21 день тому
I discovered last year, testing a DC fuse at voltage can be dramatic. They always protected the device, but the failure mode of the fuse can also be 1) a candle if the plastic ignites, or 2) an arc lamp if the voltage was enough to vaporize the metal and continues the circuit as DC has no zero crossing like AC. This is how I discovered AC rated fuses did not extinguish the arc from the DC solar panels and became a 10,000 watt arc lamp. Test all fuses, because an edge case should not be an unattended house!
@AndreasSpiess 21 день тому
Thank you for sharing your experience! These car fuses are only rated for low DC voltages. Fuses for solar panels are very different to extinguish the arc you describe.
@SkigBiggler 19 годин тому
High voltage DC is difficult to break, AC is is a lot easier because it crosses 0 regularly, meaning any arcing peters out pretty quickly. High voltage DC fuses tend to be filled with sand to quench any arc that does form, by preventing carbon tracking inside the fuse or along metal splatter from the fuse wire itself. Contactors and relays for DC are also different, the large ones often use air or a vacuum to blow the arc out, or are filled with Sulfur hexaflouride with acts as a good insulator in gas form
@no-damn-alias 6 днів тому
In a chinese car I had a rear heated window that sometimes didn't work. I took a look at the OEM fuse and the plastic was half melted and it was so warped the contacts didn't connect correctly. The wire was still okay
@AndreasSpiess 6 днів тому
So you were lucky! Molten cables would have been a pain in the a...
@no-damn-alias 6 днів тому
@@AndreasSpiess oh so true. Currently I have a different problems. AC/DC converter broken and no spare parts
@RESISTAGE 17 днів тому
I tested all the fuses I had now I'm out of fuses. thanks Andreas !
@AndreasSpiess 14 днів тому
:-))
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