(481) Are Fuses from AliExpress and Amazon really dangerous? How to test yours!

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When 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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6 апр 2024

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@AndreasSpiess 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@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 2 месяца назад

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 2 месяца назад

@@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 2 месяца назад

What are your thoughts on Linear Array Solid State LiDAR Sensors? Does it bring anything useful in comparison to single beam?

@RogierYou 2 месяца назад

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 2 месяца назад

:-))

@tonysheerness2427 2 месяца назад

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 2 месяца назад

Funnily enough, it is possible to test a fuse without blowing it. e.g. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RaSp_lY3E2U.html

@ecospider5 2 месяца назад

@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 2 месяца назад

@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 2 месяца назад

There is an Electronic Engineering joke about testing fuses! Yep that worked…. Yes that worked…. Yes that worked! Ah no more fuses :-)

@AndreasSpiess 2 месяца назад

:-)) Indeed, without ordering a few more, I would have had exactly this problem...

@uiopuiop3472 2 месяца назад

i will mayb buy 300 and test 250 and mean it out

@gg-gn3re Месяц назад

@@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 Месяц назад

But what if the next one will be the bad one?😂

@uiopuiop3472 Месяц назад

@@TomasNovotny-ep5br that what the mean values protect from

@McTroyd 2 месяца назад

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 2 месяца назад

I agree that it is a danger. That is why I made the video… good to know they will disappear.

@realedna 2 месяца назад

They're already at work to take down the video! ;-)

@michaelgleason4791 2 месяца назад

Oh my sweet summer child.

@JaredConnell 2 месяца назад

@@michaelgleason4791it's kinda cute actually, he thinks something will happen lol it must be nice to be so naive about the world

@urnoob5528 2 месяца назад

there are so many dangerous and dubious products from china that aint stopping shit

@J-Eagan 2 месяца назад

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 2 месяца назад

Good idea!

@gorak9000 2 месяца назад

Or learn to use heat shrink, and you won't blow as many fuses in the first place

@dominik4205 2 месяца назад

@@gorak9000 What does heat shrink have to do with circuit breakers?

@mekkertroniker2002 2 месяца назад

Fuses also wear out, every part that carries current wear out.

@J-Eagan 2 месяца назад

@@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 2 месяца назад

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 2 месяца назад

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 2 месяца назад

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 2 месяца назад

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 2 месяца назад

I buy the AliExpress ones. I find they're a lot more resilient than the others...

@FranklySpeaking73 2 месяца назад

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 2 месяца назад

Wilco!

@farmerwoody123 2 месяца назад

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 2 месяца назад

I agree.

@125brat 2 месяца назад

@@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 RU-vid: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KVJVswLbqaA.html By the way, fuses don't "Blow", they "operate" 😁

@ArielNMz Месяц назад

>The companies pushing these uncertified safety components I'm pretty sure it's not "the companies" but people cheaping out on components

@genomeyganomey6647 2 месяца назад

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 2 месяца назад

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 2 месяца назад

That sounds dangerously funny lol

@kevinwalters5160 2 месяца назад

There are different types of fuse, Stack Exchange has a discussion on slow blow vs fast acting.

@NinoJoel 2 месяца назад

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 2 месяца назад

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 2 месяца назад

You are right. But I used my skin as a second „thermometer“. And it indicated no danger.

@bazzaar1869 2 месяца назад

@@AndreasSpiess ah, the thermal imaging finger :) I've be using it for years!

@125brat 2 месяца назад

@@bazzaar1869 In conjunction with the Mk1 Eyeball, most testing jobs are covered 😁

@TecSanento 2 месяца назад

If you repair her stuff, she will stop questioning your expense’s;)

@AndreasSpiess 2 месяца назад

Good advice!

@musiqtee 2 месяца назад

Yep! That’s why her things always work - and mine always need repairs… (18 years and counting…🙏🪛💡🪫)

Месяц назад

And then she will say to your daughter: Never marry an engineer, you will never have anything new, he will fix everything..

@rudycandu1633 2 месяца назад

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 2 месяца назад

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.

@herzogsbuick Месяц назад

can't believe i only found your channel this week. this fuse video was eye opening, and i've been playing with circuits for 30 years (i'm no expert, however). excellent work for all skill levels. cheers from Alaska!

@AndreasSpiess Месяц назад

Thank you for your kind words!

@paulcohen1555 2 месяца назад

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 2 месяца назад

That is what I do. And dispute also small amounts. Only if it hurts it will change ;-)

@FlnSkr 2 месяца назад

the problem is that lately, we are getting worst products on Amazon than on Aliexpress.

@louwrentius 2 месяца назад

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 2 месяца назад

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 2 месяца назад

Indeed, jeffschroeder is right. I use entirely different fuses for that purpose. And I am not equipped for testing them.

@hackswell 2 месяца назад

I'm glad Andreas didn't get too angry and... blow a fuse. ;)

@AndreasSpiess 2 месяца назад

:-))

@BerndFelsche 2 месяца назад

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 2 месяца назад

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…

@mvadu 2 месяца назад

This is very approachable test method! Thank you for the guidance

@AndreasSpiess 2 месяца назад

You're welcome!

@tsbrownie 2 месяца назад

Andreas, if you think those are dodgy, you should test the resetable version of those fuses!

@AndreasSpiess 2 месяца назад

Another viewer suggested also resettable fuses. But they seem to be quite expensive (>10$ each)

@tsbrownie 2 месяца назад

@@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.

@gedgicat2063 2 месяца назад

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 2 месяца назад

I hope they are ok!

@mac0pod 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@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 2 месяца назад

true In Zimbabwe, there is no smorgasbord of variety, only cheap ones

@mrfrenzy. 2 месяца назад

@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 2 месяца назад

@@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.

@qchatgreg 2 месяца назад

as always - informative, educational and well presented.

@AndreasSpiess 2 месяца назад

Glad you think so!

@birdybirdy688 2 месяца назад

thanks Andreas, very helpful video. time to test my fuses too.

@AndreasSpiess 2 месяца назад

Good idea!

@jmr 2 месяца назад

I appreciate the information. I plan to test a few when I get a chance.

@AndreasSpiess 2 месяца назад

Good luck!

@Boz1211111 Месяц назад

Thank you so mu h for the test really answers my questions!

@AndreasSpiess Месяц назад

Glad the video was helpful!

@MeanderistHandle 2 месяца назад

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 2 месяца назад

Thank you for sharing your results. Good decision!

@marcusone1 2 месяца назад

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.

@beniaeschbach2626 2 месяца назад

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 2 месяца назад

I agree. Just change the resistor.

@douglasheld 2 месяца назад

Thanks for the excellent work!

@AndreasSpiess 2 месяца назад

My pleasure!

@glenmartin2437 2 месяца назад

Thank you, Andreas. Keep up the good videos.

@AndreasSpiess 2 месяца назад

You are welcome!

@robert574 29 дней назад

Years ago, I was working as a dispatcher at the police station, a bad storm blew in and then lightning hit the building. There was a loud bang, then everything was dead, including the lights. It blew the fuses (all black) in all the radios and scanners and blasted the connector on the rear of the Motorola radio into pieces (just the cord left). I replaced all the fuses and was amazed that they all still worked, including the Motorola transceiver just needing some resoldered wires. It took out two breakers in the main panel on the wall, but we just doubled up some wiring temporarily and everything was back. I've had a new respect for name brand fuses since then in my own stuff.

@AndreasSpiess 28 дней назад

Cool story! You were very lucky, I think.These days, I am not sure if your damage would be so small because high voltages usually kill the delicate ICs, not the current. I assume you had a very high voltage inside your building back then.

@robert574 25 дней назад

@@AndreasSpiessA couple of ham radio guys showed up right after, brought some equipment and tested the transceiver and the antenna (and brought a soldering iron). They were the real heroes of the story, but the main radio fired right up after a power cord repair. I was amazed.

@MikeKasprzak 2 месяца назад

Thank you Andreas for the PSA.

@AndreasSpiess 2 месяца назад

My pleasure!

@antonioperezseron 2 месяца назад

Thanks for your educational vidéos. ❤

@AndreasSpiess 2 месяца назад

My pleasure!

@narancs5 Месяц назад

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 Месяц назад

Also a good idea. My car is parked far from my lab, so I went this way.

@Bean-Time Месяц назад

This is a good reason to use breakers. More expensive but SUPER easy to test

@AndreasSpiess Месяц назад

Agreed if you have the space.

@allangibson8494 Месяц назад

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 Месяц назад

Thank you for the additional info!

@matambale 2 месяца назад

Thank you, Andreas.

@AndreasSpiess 2 месяца назад

My pleasure!

@DaveEtchells Месяц назад

Great idea using the electronic load - it surprised me I was only thinking in terms of the power _supply_, not the drain. It’s funny how sometimes you need to flip your thinking, it was one of those facepalm moments for me when you mentioned the electronic load 🤦‍♂️ Great video as always! 👍

@AndreasSpiess Месяц назад

Indeed, out of the box is sometimes easy…

@haajee1 Месяц назад

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 Месяц назад

The resistor value and its wattage has to be calculated with the voltage you use (Ohms law).

@haajee1 7 дней назад

@@AndreasSpiess Very late reply. but i have ordered a very nice 18650 battery holder and a 100W R33J resistor for the test. In the video you speak about 3x 1 Ohm resistor but in the scheme you wrote 0.3 Ohm. But i get arround 8 a 9 amps with a full 18650. So a 5amp fuse will not blow. The 2.5 and 3 one is quick. Maybe i got the low amp because the resistor in the battery holder or something?

@thisisyourcaptainspeaking2259 2 месяца назад

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 2 месяца назад

Good idea!

@enzofraschini7117 2 месяца назад

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 2 месяца назад

I did not check. But the datasheets are public ( not the norm papers)

@yancymuu4977 2 месяца назад

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 2 месяца назад

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…

@Spacefish007 2 месяца назад

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 2 месяца назад

Well possible. Most relay are also replaced by transistors and SSRs.

@mrtechie6810 2 месяца назад

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 2 месяца назад

Indeed, the voltage rating is also essential for some applications. For car batteries, it is usually 24V only.

@Chris-ut6eq 2 месяца назад

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 2 месяца назад

Bosch: 11 Fuses for 5$ on Amazon No Brand: 80 fuses for 8$

@pedrorela8696 2 месяца назад

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 2 месяца назад

PTC resistors are not fuses, they are resistors that change its value with heating. They have a different purpose.

@wherami 2 месяца назад

Wonderful information

@AndreasSpiess 2 месяца назад

:-)

@Bean-Time Месяц назад

I was gonna say that LiFePO4 is not pronounced 'life eppo 4' but honestly i love your mini mispronunciations

@arp_catchall 2 месяца назад

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 2 месяца назад

:-))

@ifell3 2 месяца назад

Great video!!

@AndreasSpiess 2 месяца назад

Glad you enjoyed it!

@daveys 2 месяца назад

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 2 месяца назад

It seems so. And it is dangerous if you do not know.

@daveys 2 месяца назад

@@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!)

@johna8509 2 месяца назад

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 2 месяца назад

That was really bad luck!

@nkronert 2 месяца назад

The sound at 8:52 got me to frantically search for a short circuit in my surroundings 😊

@AndreasSpiess 2 месяца назад

:-))

@saxpert 2 месяца назад

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 2 месяца назад

Ja, du kannst jede Stromquelle dafür nehmen. Ich habe etwas vorgeschlagen was in vielen Haushalten rumliegt. Einfach den Widerstand neu berechnen.

@eberger02 2 месяца назад

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 2 месяца назад

These car fuses are for low voltage only. This is where I use them (for example on my Harley)

@jamess1787 2 месяца назад

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 2 месяца назад

Thank you for sharing your results!

@AkosLukacs42 2 месяца назад

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 2 месяца назад

This video is for people like me who already purchased and use these fuses. All others can decide which risk they want to take.

@panospapadimitriou3498 2 месяца назад

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 2 месяца назад

LiFepO4 batteries are very strong and easily blow fuses...

@MarioRiesebeek 2 месяца назад

Tested a couple of chines 5 amp fuses. 1 brand dit not blow at 15 amp even after a minute or so! Thx

@AndreasSpiess 2 месяца назад

Thank you for sharing your results. Definitively time for a change…

@MarcelHuguenin 2 месяца назад

Very useful video Andreas. Was it not necessary to also test for shorts, how fast they would blow or was testing over current sufficient to establish quality level?

@AndreasSpiess 2 месяца назад

For me this was ok because I only wanted to test if they are of teh bad bunch. 1 second is fast enough for me.

@markoverton5858 2 месяца назад

Thank u for this heads up, will be testing my selection boxes, 👍👏

@AndreasSpiess 2 месяца назад

Hope they will be ok...

@nargalda773 2 месяца назад

test all fuses, just to be sure

@Chris-om7xc 2 месяца назад

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 2 месяца назад

I do not know anything about the products you mention :-(

@davideyres955 2 месяца назад

@@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.

@so4706 2 месяца назад

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 2 месяца назад

Check if these "waterproof" holders have thick wires for 25A (mine do not have it).

@so4706 2 месяца назад

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.

@quintrapnell3605 Месяц назад

That’s a relief I was worried for you.

@AndreasSpiess Месяц назад

Indeed, I was happy to see the results, too.

@douglasheld 2 месяца назад

Thanks!

@AndreasSpiess 2 месяца назад

Thank you for your support!

@bastiannenke9613 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@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 2 месяца назад

@@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 2 месяца назад

@@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 2 месяца назад

@@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.

@BerendvanBerkum0 2 месяца назад

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 2 месяца назад

Your "call back" was a good idea!

@Enigma758 2 месяца назад

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 2 месяца назад

Maybe. I just did not find specifications for slow blow car fuses.

@Enigma758 2 месяца назад

@@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.

@dzee9481 2 месяца назад

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 2 месяца назад

I mainly use glass fuses in my multimeter. So far, they have blown before the instrument was damaged, but I have not tested it.

@adamcarson1516 2 месяца назад

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 2 месяца назад

So you definitively bought off the bad ones! Good that you know now.

@sebastian19745 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@AndreasSpiess Thanks. I have seen fuses that colors are off, enough that one have to read the value to be sure.

@ats89117 2 месяца назад

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 2 месяца назад

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).

@siberx4 2 месяца назад

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 2 месяца назад

Maybe you are right. However, I did not find specifications for "slow" car fuses, only the ones I showed.

@BeefIngot 2 месяца назад

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. 2 месяца назад

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 2 месяца назад

Good idea for low current devices (

@BeefIngot 2 месяца назад

@@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 2 месяца назад

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 2 месяца назад

@@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.

@AJB2K3 2 месяца назад

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 2 месяца назад

I did not find datasheets for slow car fuses. It seems that one size fits all.

@kain0m Месяц назад

No slow / fast blow for this style of fuse - they have one defined target characteristic.

@Bean-Time Месяц назад

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 Месяц назад

I thought that these values are included in the curves (forever to blow=must not blow)

@richardjones38 2 месяца назад

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 2 месяца назад

Thank you for sharing your experience. I agree with the brands you mentioned. For the rest, you have to be careful.

@olafschermann1592 2 месяца назад

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 2 месяца назад

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 2 месяца назад

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).

@kain0m Месяц назад

Getting warm is their method for blowing. You sinply can't overheat a fuse, it will just blow and break the current flow. Voltage rating is another consideration, though...

@oliverer3 2 месяца назад

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 2 месяца назад

They do not suffer from these problems, I assume...

@oliverer3 2 месяца назад

@@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.

@BenMitro 2 месяца назад

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 2 месяца назад

I have no clue because I am a low voltage/low current guy ;-)

@EgonSorensen 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@GuidoAmbar Nice idea, thanks Guido.

@BenMitro 2 месяца назад

@@AndreasSpiess You mean a low power guy :)

@Jawst Месяц назад

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 Месяц назад

I also often use glas fuses. But for cars and motorcycles, I use these.

@abdelhakimallal3753 2 месяца назад

Strange, this never occurred to me even though i had never trusted cheap products, Thanks Andreas for the video

@AndreasSpiess 2 месяца назад

Increasing the price (as many resellers do) does not make a product better ;-)

@salan3 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@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 2 месяца назад

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.

@TecSanento 2 месяца назад

Are there any resettable car fuse’s?

@AndreasSpiess 2 месяца назад

Yes. Another commenter mentioned them. However, they are not cheap (>10$)

@JuulCPH 2 месяца назад

Does anyone know where in the U.S. you can buy a brand name 5x20mm fuse kit with a decent assortment of values? Especially something that includes smaller values like 200 to 800 mA

@AndreasSpiess 2 месяца назад

I obviously do not know :-(

@rasimbot 2 месяца назад

Voltage may be important in terms of dynamic processes during blowing

@AndreasSpiess 2 месяца назад

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.

@Alpine_flo92002 2 месяца назад

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 2 месяца назад

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 2 месяца назад

@@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.

@geoffvdw 2 месяца назад

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 2 месяца назад

Good point!

@oilybrakes 2 месяца назад

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 2 месяца назад

Thank you for sharing your results!

@burnedupsparkytipsandrevie9597 2 месяца назад

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 2 месяца назад

Also a goo thing. I just wanted to sort the bad ones out.

@mattbw-G5MAT 2 месяца назад

I have tested mine and have the same box, they’re fine. I do however have a smart fire alarm that does not alert even if held over a burning material. How many fire alarms from China are potentially deadly like this?

@AndreasSpiess 2 месяца назад

Indeed, a scary thing, too!

@greenspiraldragon 2 месяца назад

Do the bad fuses have a resistance out of spec?

@AndreasSpiess Месяц назад

I did not check if the resistance is specified. But for sure they have much a lower resistance than the good ones.

@retrofitter Месяц назад

A Modern electronic stick welder would make an excellent adjustable current source, or a car battery with halogen head lamps

@AndreasSpiess Месяц назад

Good idea!

@Poult100 2 месяца назад

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 2 месяца назад

That could be a good excuse to have every device twice ... for "load balancing" :)

@AndreasSpiess 2 месяца назад

Which problem? Wife or fuses ;-)

@Poult100 2 месяца назад

@@AndreasSpiess Haha! Both, I suppose, but I was referring to each in equal quantities. 😆

@jpcaretta8847 2 месяца назад

I always test my fuses ! Problem, when I install them, they dont work anymore !! I have to use a thin coper wire instead !!!

@AndreasSpiess 2 месяца назад

Is this what they call „best practice“? ;-)

@peter.stimpel 2 месяца назад

While I get the idea of this video, I disagree on the topic of buying such important parts from no name manufacturers.Fuses are kind of life saving devices. They protect our houses, equipment and even ourselves from damage. Nobody would buy lifesavers from dodgy sources. Why do we different for fuses? Don't go cheap on security. The reputable brands are only a single click away from the dodgy ones.

@AndreasSpiess 2 месяца назад

I agree. I made this video for the guys like me who did not think too much when we ordered an assortment. I would see it as a "call for action": Either test yours or throw them away without testing...

@BeefIngot 2 месяца назад

I say dont buy fuses at all (for most projects) Use ICs like TPS2553D instead.

@r_firefly4292 2 месяца назад

@@BeefIngot For your personal projects, sure you can modify your design to accommodate a current limit IC. But in most cases, a simple and robust fuse from reliable suppliers can fulfill this role just fine. Furthermore, you can also get counterfeit ICs from shady sources, just like how you can get counterfeit fuses.

@BeefIngot 2 месяца назад

@@r_firefly4292 I don't see why this would be limited to personal projects when power management IC like this are literally created for mass adoption in commercial products. This is the most professional solution and certainly better than bodging in a fuse which wont also do things like reverse current flow prevention and over voltage protection. Furthermore, there isnt any reason you cant order from LCSC, Mouser, Digikey etc. These chips arent exactly expensive. Compared to a pack of fuses, a reusable, tunable IC seems the expedient option to me. I mean, consider this: The IC I mentioned, is quite literally the same price per unit as an assortment kit of Bosch blade fuses on Amazon, sure a little bit more if mounted onto a breakout board, but nothing crazy. Actually, if you buy the same number of these IC bulk discounting gets you down to 2/3rds the cost of a fuse. To me thats crazy. A more efficient solution for less money, from a reliable manufacturer.

@BeefIngot 2 месяца назад

@@r_firefly4292 For personal projects? I dont get the distinction. The IC I mentioned is made by a reliable manufacturer, sold from valid distributors like LCSC, Digikey, Mouser, and is cheaper per unit than buying a bulk pack of bosch fuses from Amazon. Cheaper, more precisely set, and with a bunch of other features like overvoltage protection, reverse current protection and more makes this a great option in my mind. Adding a breakout board you still might come out ahead on price per unit and if you are putting this onto a pcb, it completely destroys fuses on cost.

@peppigue 2 месяца назад

i also used to think bosch meant quality, but had a bad experience with their wipers on my vw caddy

@AndreasSpiess 2 месяца назад

Bad luck, I think.

@klassichd10 2 месяца назад

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 2 месяца назад

Good info (I did not know that fact). The remark was more for the guys that sometimes mix Switzerland with Sweden ;-)

@john-r-edge 2 месяца назад

@@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 2 месяца назад

@@john-r-edge Žižek is an idiot but that doesn't make him a malefactor

@JCWren 2 месяца назад

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 2 месяца назад

Go for it!

@shagof Месяц назад

have you tested the fusebox from aliexpress? I want to buy one for a wled project

@AndreasSpiess Месяц назад

No. Only the fuses.

@grahamwoan9588 2 месяца назад

I've just looked up the British Standard (BS1362) for the default "13 amp" fuse found in UK plugs. A compliant fuse must be able to pass 20.8 A indefinitely. At 40 A, the fuse must blow within a time window of 0.5 s to 100 s to be compliant with the standard. The 13 A rating comes from its power dissipation at that current, which must not exceed one watt. Fuse specs are surprising!

@AndreasSpiess 2 месяца назад

I learned that the fuses in your connectors (a UK-speciality!) are more like the ones we have in our distribution boxes. They have to protect the cables where the plug is mounted. Your home wires support a very high amperage. Very different to how we cable our homes.