Why Circuit Breakers DON'T Protect People (electric shocks)

Рет қаралды 702,748

Ай бұрын

How do MCB's work? Get a 30 day free trial and 20% off an annual subscription.🎁 Click here: brilliant.org/EngineeringMindset
How do miniature circuit breaks (MCB) work and why do they protect cables not people. What makes the trip, what happens inside, where are they used and how do we read the charts.
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Пікірлер: 631

@EngineeringMindset Ай бұрын

*This free video took weeks to make!* if it helped you and you'd like to thank or support Paul's efforts, link below: PayPal: www.paypal.me/TheEngineerinMindset Patreon: www.patreon.com/theengineeringmindset Channel membership: kzfaq.info/love/k0fGHsCEzGig-rSzkfCjMwjoin

@windowsgaming-dn9qx Ай бұрын

how many times did you zap yourself

@Win11FTW 28 күн бұрын

Yeah it true

@BeaulieuTodd 26 күн бұрын

The video literally stated just that, right from very start.

@philpeko1796 25 күн бұрын

Congratulations for achieving such a useful, educating, yet understandable channel, and thank you for your work. Loing time s subscriber, I wanted to thank you using some of your Amazon affiliates Tools links, but almost half of them are broken, or products are unavailable. May I know when you could update them, and keep us posted? Peace & Prosper! ❤ & 🖖

@michaelm6597 25 күн бұрын

I knew immediately where you were going with the name of the video and was well done. This gave extremely good insight to how breakers work and I personally loved the bits showing how they trigger with the side removed (especially as I would never remove the side of one myself)

@thomasvlaskampiii6850 Ай бұрын

The fact that you replied to my comment from 3 years ago and gave a link to this video was a nice gesture. I appreciate it

@EngineeringMindset Ай бұрын

It took a while to make, but I hope you enjoy the video

@2Pzp 26 күн бұрын

@@EngineeringMindset Not every hero wears a cape

@Ryuken2721 25 күн бұрын

great stuff takes time.

@tanithrosenbaum 25 күн бұрын

@@2Pzp Engineering heroes wear shirts, ties, jeans and tennis shoes :)

@xTerminatorAndy 29 күн бұрын

This is a gold standard for showing how breakers work. Very pleased with that

@TishaHayes 25 күн бұрын

As an electrical engineer I have repeatedly attempted to explain circuit breaker operation and curves to technicians and electricians. No matter how extensive (or simplistic) I make my explanation it ends up with them offering up a sceptical look and them just accepting the answer without really gaining an understanding. This is an excellent video; I shall share this as the teaching video for breakers. Thanks so much for putting the effort in to creating it.

@johnchestnut5340 25 күн бұрын

You interact with the wrong technicians. I started in engineering and moved to technology. I ran out of money before finishing. I assure you that this is covered in technology classes. Electricians are at least introduced to this information. Perhaps the teachers are more knowledgeable than competent?

@bladeoflucatiel 24 күн бұрын

its not rocket science, you should start by showing them actual manufacturers datasheets (hager, abb, siemens) instead of generic theoretical curves and going item by item and what they mean. Buy a couple of diferent types of breakers and pass they around during class. You should also mention its more about the country regulations than actual specs requirements, for instance in the UK they use type B breaker with 6000amps breaking capacity, while in europe its C type 3000amps.

@GregoVal 23 күн бұрын

I don't know where these electricians came from. But any certified electrical technician should know something as basic as how electrical protections work.

@laus9953 17 күн бұрын

@@bladeoflucatielno, he shouldn't - his presentation is fine the way it is ! your country specs statement is wrong.

@JoaoVictor-hz4rm Ай бұрын

I'm loving this more live-action kind of videos

@EngineeringMindset Ай бұрын

Glad to hear, will be doing more of them where possible

@JoaoVictor-hz4rm Ай бұрын

@EngineeringMindset glad to hear, today's videos are becoming more and more made without love or even with AI in some extent, you're putting more and more of your personality in your content

@thawzinkhant1759 29 күн бұрын

I concur

@tuckkeongho 29 күн бұрын

This is about the best video explaining how a MCB works. Well done.

@AtAGlimpse_UB 29 күн бұрын

Dude, the transitions are so freaking mind boggling! Great Job Paul!

@EngineeringMindset 29 күн бұрын

Thank you, glad you liked the hard work

@somedude4805 25 күн бұрын

They’re not meant to protect people, they’re meant to protect circuits. That’s why they’re called “circuit breakers” and not “people protectors”.

@leeroyjenkins0 25 күн бұрын

They're meant to bag air, not to protect people. That's why they're called "air bags" not "people protectors" Filling the bag with air is a means to protect people. So could be breaking the circuit. Logic doesn't seem to hold up.

@icyboyy6177 25 күн бұрын

@@leeroyjenkins0we should call every thing that protects people: “people protector”. Helmet? People protector. Epinephrine pen? People protector!

@quinnwhite8761 25 күн бұрын

@@leeroyjenkins0no. they are not designed to protect people. circuit breakers, more properly known as overcurrent protection devices (OCPD) stop the flow of electricity in the event of an overcurrent to stop the wires from heating up. its to protect the insulation of the wires, not people.

@JPK1337 25 күн бұрын

he's right tho.. circuit breakers are supposed to save the circuits inside the walls from getting destroyed. they are not for safety. that's what an rcd is for. @@leeroyjenkins0

@idonjohnson6999 25 күн бұрын

So you could say they break people.

@gg-gn3re 27 күн бұрын

@13:00 good to add that the arc chamber is "up" aka away from gravity. The arc travels up as heat rises due to gravity. If you install breakers upside down you can actually get good arcs to melt internals instead. It's a fun exercise lol awesome video as always

@FilinMXr 25 күн бұрын

I was just wondering why arc moves upward, thank you

@thebamplayer 25 күн бұрын

Also the resulting magnetic field moves the arc away.

@ImieNazwiskoOK 25 күн бұрын

Seems like circuit breakers for the ISS might be bit more tricky(aside from a lot of them having to work on DC voltage)

@gg-gn3re 25 күн бұрын

@@ImieNazwiskoOK Yea even DC breakers on earth are designed differently/specific to DC. Getting the arc killed on DC is much more difficult as well I wonder how the space station ones look but the magnetic field up there probably takes priority thus it may not need much of a design difference. Down on earth it's so weak that the heat matters more and heat rises due to gravity

@JackCobalt 25 күн бұрын

I'm glad you said qualified and competent at 4:20, because I've seen a lot of people who are competent who think they're qualified, and people who are qualified but aren't quite competent 😂😂

@jhanthony2 Ай бұрын

Those circuit-breaker graphs are great! I learned a lot from this.

@altuber99_athlete 28 күн бұрын

They are called trip curves.

@TheEulerID Ай бұрын

The title is a bit misleading. True, MCBs do not protect people from fatal electric shocks. However, they do protect people from electrical fires due to overloads and, statistically speaking, electrical fires have been a much killer of people than electric shocks (particularly in the USA I should add, partly because of the way they build houses). To say that it is just there to protect property is simply not the case. Also, some MCBs are twin pole, although that's more an industrial and European domestic thing (at least in some countries). However, excellent job at explaining how MCBs work, and especially the dual-mode switching and why it's done that way. I note, there is still no mention of RCBOs. Those dual RCD consumer units are, thankfully, rapidly being confined to history and many electricians will no longer quote for split RCD CUs, and I'm a bit surprised that the regulations still allow them. Of course, then we come onto a far more contentious point, which as AFDDs.

@EngineeringMindset 29 күн бұрын

Glad you enjoyed the video, note that RCD, RCBO etc will be covered in detail in dedicated videos. You have some good points but I will also add, and I'm sure you're already aware, but the MCB will only prevent (hopefully) a fire occurring from an overloaded cable, for example fixed wiring in the wall. But, most fires in homes start from faulty appliances. For example, if the decorative casing on a toaster catches fire, the MCB won't trip, it will happily keep providing power and heat to the fire until the entire house is ablaze. It will only trip when it detects a short or overload from something melting and creating a low resistance path. However, if someone drives a nail through the line and neutral when hanging a picture frame, it will detect this and cut the power, otherwise the nail would start glowing red and cause a fire. So it will only prevent certain fires. It won't prevent electric shocks, which I think most people believe is the case.

@muulsh5341 27 күн бұрын

I was wondering what is the difference between single and twin pole ? In my breaker panel (in France) everything is a c type twin pole and I heard from a video by a french electrician that single pole was used before but it's no longer the case and less safe

@tomr6955 27 күн бұрын

I've seen misleading titles in my time and this is NOT the hill to die on

@S-mz2my 27 күн бұрын

single pole is for the live wire of a unique circuit -double or twin pole is FOR THE same circuit protection of the neutral wire @@muulsh5341

@yourfaceisonfire 27 күн бұрын

I’m an electrotechnology lecturer, we teach our students the same thing by starting with the “breakers protect cable, RCDs protect people” in service of making the distinction between their designed purpose.

@unyu-cyberstorm64 25 күн бұрын

101 reason why you need a GFCI

@razsegev6415 23 күн бұрын

Rcd and GFCI is the same, only the scale and tripping current are different

@unyu-cyberstorm64 23 күн бұрын

@@razsegev6415ah yes

@unyu-cyberstorm64 23 күн бұрын

@@razsegev6415can they be used together?

@razsegev6415 23 күн бұрын

@@unyu-cyberstorm64 probably. I made the first comment because Rcd was mentioned in the video.

@unyu-cyberstorm64 23 күн бұрын

@@razsegev6415 They're the same thing. The point is tho, Circuit Breakers and Fuses protect property, GFCI/RCD/RCCB protect _people_ for added protection you could also install an AFCI or Arc Fault Circuit interrupter. They protect from Arc Faults.

@melliflousbufo 24 күн бұрын

Utterly brilliant description - thanks so much for taking the time to put this together!

@theavchap 24 күн бұрын

The clearest and simplest demonstration and explanation of how this works. Excellent work!

@thorbjrnschnellthanner2642 26 күн бұрын

Its wild how much engineering and thoughts have gone into these circut breakers. Well explained, easy to digest.

@luispereira3 29 күн бұрын

Love the new format and the face behind the hard work! Thank you Paul for sharing the knowledge with the world, I've learnt so much from your videos!

@arjun-vh7np 24 күн бұрын

You are the only electrical engineer i have noticed explaining the breaker selection chart clearly and neatly....do more videos brother keep it up....

@__u__9464 24 күн бұрын

This was easily the best video I've ever seen on this topic in my whole life. Top tier quality right here

@rahul2000 23 күн бұрын

bro have one of the best engineering channels i have learnt a lot from you despite being a mechanical engineer myself about electrical as i also had a specializing in automation

@timothysands5537 26 күн бұрын

Phenomenal video. I thought I understood breakers, but I never once looked at the trip charts nor had I noticed the Arc chamber. Thank you for this!

@IrisNebula7023 25 күн бұрын

Awesome video, very well explained concepts. I had to learn everything in this about a year ago, but it took a friend hinting me to the right direction and a whole afternoon of studying, this would had a been great help 😊

@Felipe_Nogueira 25 күн бұрын

The best class about circuit breakers I'd seen!! Congratulations for the content!

@pcfreak1992 22 күн бұрын

This video has one of the best animations I have ever seen in an engineering video, good job! 👏

@HimalayanYeti 29 күн бұрын

This is amazing!! The depth and simplicity of the explanation is just brilliant!!

@tedchirvasiu 26 күн бұрын

.org

@allangibson8494 27 күн бұрын

MCB’s can be safely mixed because they are designed to a common mechanical and electrical standard. Different manufacturers only becomes an issue if a distribution comb is used but that can even be an issue even with in a specific brand. The leading letter refers to the trip curve which goes beyond B, C and D - “A” being fastest and “F” being slowest (and usually used for variable speed motor circuits (and occasionally switch mode power supplies with high inrush currents). C curve breakers are the most common in domestic use. Direct On Line started motors typically draw seven times the running current during start. Hard Start Switch Mode Power Supplies draw their full output load current during starting - so a 5V 1000A supply will draw 1000A for the first fraction of a cycle until the output reaches 5V - so from a 240V supply 240kW (and having tripped a gas fired power station offline by turning on a computer system, this could happen (steady state the system drew 1kW - the power supplies were oversized and redundant (2off)).

@themohaa2 24 күн бұрын

The only problem with this is that you will void any potential warranty the manufacturers give you, as it wasn’t used as they intended. Also, you cannot use that manufacturers electrical data/certification as this was only done based on their own parts. So if there was a house fire and they find out you have mixed breakers, etc, there’s no come back. Also on odd occasions the breakers just won’t physically fit in each other’s boards when the front plate is attached.

@allangibson8494 24 күн бұрын

@@themohaa2 Mixed breakers are legal if installed correctly. If they don’t fit the manufacturer is selling non standards compliant equipment. Thats what standards are for - to ensure interoperability and interchangeability. BTW - my home switch board has five different manufacturers breakers installed, no problems because they are signed off by an electrical inspector. I have however had issues with incompetent electricians not tightening screws repeatedly.

@laus9953 17 күн бұрын

"C" - type MCBs are most UNcommon in domestic installations.

@allangibson8494 17 күн бұрын

@@laus9953 Which will come as a surprise to every electrician I have worked with - every house I have lived in was fitted with “C” curve breakers (including the ones on the solar panels). I’ve used “D” curve breakers on switch-mode power supplies in special cases and “A” curve on thyristor controlled heaters (to protect the thyristors). RCD breakers are a design requirement where I work too on all power circuits.

@skysurferuk 23 күн бұрын

A clear, concise explanation of these magical devices. Awesome, & many thanks for your work. 👍

@Logical19 25 күн бұрын

i just stumbled across this channel and i LOVE it! this really helps with understanding things like this. ive always wondered about. thank you!

@nikolaskurnia7404 24 күн бұрын

This explanation is so good!! Definitely need more of these videos, from RCD to medium voltage devices

@AlmightyPyro 23 күн бұрын

this is the best video i’ve seen about this topic.

@Ryan-cm5rm 26 күн бұрын

This is a really well produced video! Great job!

@AJTarnas 5 күн бұрын

incredible detail. above and beyond all other explanations. fantastic work.

@mysterion4301 23 күн бұрын

As a young apprentice back in 1974 I was taught that the amperage you have to worry about killing you is "any amperage that is enough to stop your heart." In the US people tend to think that's either 15 amps or 20 amps because those are the most common sizes for breakers in their home's panel.

@PlayboyHZ 22 күн бұрын

100mA is potentially enough to stop your heart. It also depends on the voltage

@MrDreugh 25 күн бұрын

Awesome video! I have never seen a video by you before, but I am glad I did. Keep up the good work 👍🏻 (I subscribed)

@datadrivendave 26 күн бұрын

My dad asked me just last week how breakers work. I knew there was a bimetallic strip, and was fairly sure there was also a solenoid. But this added some bits to my knowledge that were missing. Great video!

@mariustv927 2 күн бұрын

I'm an electrician and pretty much knew this stuff already. But you explained it so incredibly well and entertaining that I just had to watch the whole thing. Thank you!

@jamesbensley7914 25 күн бұрын

Explained so well, Will save this for future teaching of remedials.

@LovSven2011 24 күн бұрын

Great visual explanation of Circut breaker parts and operation. Liked! 🙂

@parthasinha7311 24 күн бұрын

Excellent video! Thanks for creating such a high quality video on circuit breakers. Learning becomes so easy with visualization of the operation.

@kushanchathuranga2707 27 күн бұрын

Incredibly informative video, best video for explaining the MCB function, you are great man... ❤❤

@mathiastomixd 7 күн бұрын

Best Video I have seen in a while, so good explained and detailed :)

@Seijakukun 23 күн бұрын

so glad I spent (less than) 20 minutes watching this video. everything electricity related is not so widely know where I live, so I appreciate every piece of knowledge I can grasp!!

@ukaszk3755 27 күн бұрын

Great video. I like your animation and cross-section efect. It realy help to understand.

@muffinglish 25 күн бұрын

Great explanation and corresponding video. I was interested in trying to answer the question of which uses more energy -cordless or plug in vacuum cleaner.

@robertnull 25 күн бұрын

I'm new on this channel, I'm amazed how high quality this video was! Kudos!

@ojeantas5180 6 күн бұрын

im gonna call you Mr. Bugs for making this rabbit hole easy to understand. i enjoyed every minute of your video

@richardcampbell4506 25 күн бұрын

What a fantastically clear and detailed explanation of an everyday item. Thanks

@kobusdowney5291 26 күн бұрын

Interesting Video, well explained. Here in South Africa we always wire incoming power to the top of the breaker, while outgoing is from the bottom. That way it is easier to not mistakenly touch live wires, since top is always live while bottom is isolated when a breaker is off.

@techtechnicalgaming Ай бұрын

As always loved your videos ❤ and please make videos on other types of transistors and their uses❤❤

@keitho77 28 күн бұрын

Brilliant explanation of MCB's and their inner workings

@anurimapal7768 Күн бұрын

I think this video should be archived for students to learn. Really great presentation. ❤❤🎉🎉

@bjornroesbeke 29 күн бұрын

Pointing out what the "3000/4500/6000/10000" is for would fit this video well. All too often i hear people (even colleagues) say "it can handle 10000 volts" and they refuse to accept that it means Icu or maximum breakable short circuit current.

@EngineeringMindset 29 күн бұрын

Good point, If the video is popular I can follow up with some additional info.

@Tramm454 25 күн бұрын

Nice video, with closeup to details.

@Srinathji_Das 23 күн бұрын

Wow! This was a real treat! Thank you so very much!

@Thoran666 24 күн бұрын

Awesome video. I never fully understood how breakers work, now I do. I wish there was a German bubbed version so I could share this with more friends.

@smarteth4342 Ай бұрын

I really love your videos. you made me more attached to the electrical concepts. thank you so much with much respect.😍😍

@EngineeringMindset Ай бұрын

Glad you like them!

@user-dp2lh1hc3z 3 күн бұрын

Phenomenal work. Thank you very much !

@divoc6015 27 күн бұрын

That is a perfect explanation keep it up!

@s.stefan6257 21 күн бұрын

Great video, you make the world a better place, providing such essential information tp all of us

@Ghou1Lord 4 күн бұрын

This must be the best video available explaining breakers.

@JustTim1916 29 күн бұрын

Really good video and well presented. Thank you

@paulswearingen4395 26 күн бұрын

Great explanation and demonstration of the operation of a thermal magnetic breaker. However, I think it’s worth mentioning that circuit breakers do protect persons from electric shock - with proper grounding and bonding practices. The most likely scenario for a person to come into contact with an energized conductor is if said conductor has inadvertently touched a conductive casing that is not meant to be energized. When a person touches that casing their body is the current path for the fault (for any electrical system that uses earth as neutral). As you pointed out, fault current through a human body may be too low to trip the breaker and you end up being an unwilling conductor for much too long. To solve this issue, electrical systems are required to be properly grounded and bonded. This means that when metal casings (or other non current carrying conductors) are bonded to a conductive grounding system and become energized, the fault will now travel with low resistance through the grounding system, produce high current, and trip the associated breaker; thus preventing an electric shock. I really appreciate your content and just want to add some clarity to your title.

@MaxPowerElectric 22 күн бұрын

A good point that I was going to mention as well. Grounding/bonding is obviously very widely misunderstood topic. As an apprentice electrician I even hear many of my instructors repeat the claim that "OCPDs prevent fires, GFCIs prevent shocks" which is true of course, but it fails to capture the purpose of bonding all metal parts in or near electrical systems together--the short circuit protection offered by fuses and breakers also serves the dual purpose of quickly removing hazardous voltages between exposed conductive surfaces during fault conditions, limiting the duration of a possible shock and the potential for serious injury--again illustrated by the time-current curves for these devices

@__Man__ Ай бұрын

Informative video. Really appreciate it.

@Curios_Caco 18 күн бұрын

This was an amazing video, great job sir

@muthuramanchinnadurai8260 27 күн бұрын

Thank you very much for the video - Loved it😊

@edgarstevenmatira5256 25 күн бұрын

Absolutely phenomenal video. Thank you very much

@amrkoptan4041 12 күн бұрын

exceptional !! very thorough explanation!

@wtfucrazy 29 күн бұрын

nice video (like always). keep up the excellent work

@thanhheu4129 Ай бұрын

Thank you. Your videos have a huge education value and absolutely are informative, i learnt new things about CBs i didn't know before. Thank you 🙏☺️

@EngineeringMindset 29 күн бұрын

Glad to help!

@mrskulf 26 күн бұрын

This video was awesome, nice job.

@winlose3073 29 күн бұрын

Hi Paul this is very nice and informative post thanks!

@CptAlucard 26 күн бұрын

Amazing explanation, great video!

@Supep007 24 күн бұрын

Awesome explanation and visuals. Now it makes me wonder why residential systems in my country only use C-type MCBs as the norm.

@ronancollins4006 Күн бұрын

Electricity confuses me so much and I'm trying to learn what I can from time to time and I had been wondering how circuit breakers work. This was very very informative and interesting. Thank you :)

@themightybeast4716 25 күн бұрын

bro since I was a kid I always wondered how they work and what they meant like I been into this question for very long years and now thanks to you I know exactly how they work and what the rating are for. you would be surprised of how even the sellers in my county have no idea what they are for like they would ask you the AMPS and if you say 35 then boom here you go. nothing else no explanation of the ABC and stuff they would just tell you its the same. This Video helped a Lot and means a lot to me thanks so much for the easy but very detailed explanation. Sending Big Hugs :)

@millax-ev6yz 24 күн бұрын

If you were here, I would shake your hand, take you to your favorite pub, and buy you as many pints as you want. This video is exceptional! I've used these breakers so many times and this was an amazing demonstration and explanation. You are beyond incredible! I love your channel!

@HabboBoembery Ай бұрын

Nice video bro, appreciate the content

@EngineeringMindset Ай бұрын

Thank you

@francknos 29 күн бұрын

So instructive ! THANKS !

@wshcsafety28 28 күн бұрын

this video come out just the right timing for my exam . Great work 🥳

@lemonidas3009 Күн бұрын

very good explaining video , please make for more information about RCD breakers

@Infiniteknowledgenikhilrathod 24 күн бұрын

Very great & detail explanation 👌

@fakrulislam5404 2 күн бұрын

thanks a lot. your videos can save million of lives.

@morsikpl 26 күн бұрын

What a great video! Since I wanna build house, it's great to know how those work. Sure I'll still hire real electrician, but it's still important to understand why those trips and how they really work. Thanks!

@simey6327 26 күн бұрын

Around 1.30min: I believe the inner (red / blue in video) covering is the electrical insulation but the outer grey is the sheath and is there for mechanical protection. Not taking anything away from the video which was fantastic.

@aseandersen1791 Ай бұрын

I am becoming an electrician now and you have helped me to understand electrical consepts. Thank you!

@EngineeringMindset Ай бұрын

Glad to help!

@gregwelch6658 25 күн бұрын

Excellent video!! Very well done!

@Thevadassen 26 күн бұрын

Amazing. Love it Mate!

@Stelios.Posantzis 28 күн бұрын

This is a great explanation of the inner workings of a circuit breaker. Excellent work! There are, however, still questions left unanswered, mainly: a) at 11:40: Why does the piston always move downwards even if the current may be passing through the coil in either direction? There is no diode element in the circuit breaker. b) at 12:54: Why does the electric arc move from the narrower gap section to the wider gap section? Surely, the arc is easier to maintain when the gap between two electrodes is shorter. c) at 12:49: Why is the double copper electrode needed? Is the metal vaporized by the arc temperature or is the double thickness needed to better dissipate the heat generated by the arc?

@Kavyatej 26 күн бұрын

the explanation to all of them are short, you can look them up!, but if he included it in the vid, it would have gotten a bit too "beginnery" or long

@xamanto 24 күн бұрын

Very informative, thank you!

@s0012823 26 күн бұрын

Great video thnx! Learned a lot!

@peterparson6151 25 күн бұрын

Very clear description and video with no Unnecessary BS.

@gabrijelcoh Ай бұрын

great video dude, keep making these!

@EngineeringMindset Ай бұрын

Thanks, will do!

@elye3701 26 күн бұрын

Very well done. Thank you.

@Last_outkast 15 күн бұрын

Great video. Off topic. I'm looking to get back into electrical technician work, I got a serious work injury two weeks before I graduated with a two year in electrical technology and a two year in power and control. I should be better in about six months and I was hoping to retrain myself to be ready to work. What videos, apps , books courses, Whatever would you all suggest?

@ChristopherVangelder 24 күн бұрын

I learned something new today! Thanks

@e5Group Ай бұрын

Fully appreciate this excellent video

@sciencespectrum3855 27 күн бұрын

Amazing explanation 🎉

@Shogun619 24 күн бұрын

This video is a masterpiece. You guys are Brilliant.

@calvinloh_ls 26 күн бұрын

Thanks for this great video! Could you please explain why do we need to consider a 80% coefficient when designing a electrical circuit with these MCBs? For example, if a MCB is rated at 10A and the actual connected load of to the MCB is designed to be not more than 8A for a 24x7 load. Is it to consider the fact that constant high current load may cause the bimetallic strip to heat up and if let it running for long hours, it will expand and eventually cause the MCB to trip? And also, why must it be 80% and not 70% or 90%? Is there any standard for this?