CIRCUIT BREAKERS - How They Work & Different Types

Рет қаралды 130,484

Күн бұрын

Some of the most important components of any electrical system are its circuit breakers, so let's talk about them, how they work and the different styles.
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PRODUCTS USED IN VIDEO
Klein Flathead Screwdriver: amzn.to/3iteZjW
Square D Homeline 20A breaker: amzn.to/39NMCZG
Square D QO 20A breaker: amzn.to/3ioB9DM
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Zinsco 20A Breaker: amzn.to/3qvNOI7
What is a CB?
Circuit breakers are safety devices that stop the flow of electricity when it’s specifically rated parameters are passed. These can come in a few forms, the first is an Overcurrent Protection Device or OCPD, which you can read all about in Article 240 of the NEC. These circuit breakers do exactly what they say they do, use various methods to prevent a branch circuit from receiving too much current or amperage. Another is fuses. Fuses usually come in the form a tube with a metal filament inside that breaks when too much current travels through it, opening the circuit. Unlike breakers, fuses no longer function after the first short and must be replaced.
How does it work?
Thermomagnetic circuit breakers work with two elements, these are the most common breakers and the type we use most in homes and small businesses. The first element is a bi-metal strip. When too much current passes through this bi-metal strip, it heats up causing the strip to warp and change shape, releasing the spring inside of the breaker, opening the circuit to stop the flow of electricity. This slow build up of heat is caused by an Overload, which happens when the circuit is demanding more current than the breaker is rated for. The amount of time it takes for this breaker to trip is directly related to how much amperage it receives. This mechanism is what classifies this as an Inverse-time breaker. The more amperage they receive the quicker they trip, but if the overload is minimal, say two or three amps, it will take much more time to trip than if the breaker experienced a short. Google an inverse breaker time table and get a good look, it’s pretty cool stuff.
The second element of thermomagnetic breakers is the magnetic! When a short occurs in a circuit, an intense amount of electricity is released in the form of light and heat. This huge flow of electricity creates a magnetic field that instantaneously separates the magnetic strips inside the breaker, causing it to release the internal spring that trips the lever and opens the circuit. This type of tripping classifies these breakers as Instantaneous. Because of how many amps these short circuits can generate, most standard residential circuit breakers are rated to withstand 10,000 amps before completely blowing up and melting.
Some breakers come with extra components that allow for more versatile control, like the Shunt-Trip breaker, which communicates with other important systems like security and fire suppression. These systems tell the breaker when to trip without triggering either of the thermomagnetic elements, and is essential for some of the emergencies that can happen in restaurants and factories etc. Another type is Electronic or “smart” breakers, which are designed to fit into a panel that is connected to a computer system so it can be controlled remotely...
For the full article or to watch the video on Dustin's website:
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Stay safe out there, Love from the ATX
#Breakers #AFCI #Electrical
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Пікірлер: 126

@calisthenicsforlife177 3 жыл бұрын

All the free knowledge you are laying out is so helpful you have no idea!!

@user-dr2pg8fk2i 3 жыл бұрын

Patreon? Yeah, that needs to be a thing for this quality of info.

@jonanderson5142 3 жыл бұрын

I'm a Older Electrician I'm the type that learns/comprehends by physically hands on . And though I have the understanding of this doing this 30 years. Your doing a Excellent job with these videos some of us can pick up a book and get nothing out of we need the hands on visual aids for it to stick in are Melons .. Nice Job 😊

@Mach3astro Жыл бұрын

I’m currently enrolled in tech school. I’m Six months in but I realized earlier during the program that the teachers just read the power points and there’s barely any hands on. I feel that I could’ve learned what I was taught in half of the time and I feel that there’s a lot more that they should’ve taught instead of boring the classes To death with PowerPoints.

@tidurphious 3 жыл бұрын

Hats off to your channel man. I have been unfortunate to be stuck working under an unqualified journeyman at my work site. These videos have truly been a blessing as most of my questions would have never been answered have I not come across your channel. Keep pumping these videos. I’ll be sure to keep viewing 🤙🏽

@raymond3722 3 жыл бұрын

Priceless amount of information and the illustration and breakdowns of each items are just phenomenal.

@JenniferCosgrove 5 ай бұрын

Thank you so much! I've been going insane trying to figure out the difference between magnetic and thermal breakers - you are the ONLY source who has been able to break this down for me in a way that makes sense. Now I totally get it. I really can't thank you enough!!!!

@ryanfelton5012 2 жыл бұрын

Having issues with a desktop cnc trippn my 220 so the past 2 weeks has been learning on how power works. 3rd video of yours and you give the most info in the easiest way to comprehend. Big thanks man.

@JoseLopez-lm1bf 2 жыл бұрын

I've been trying to learn a little bit about circuit breakers I looked into a lot of different channels and you are the 1st person that explained that blamed it the way that I understood thank you you earn my subscription

@paullucchesi4258 3 жыл бұрын

I love your channel, I’ve watched all you videos and I want to be an electrician because of it. Thanks for all the knowledge you’ve given us through your videos

@generichards6497 3 жыл бұрын

Very cool information. I'm glad that I stumbled on to your channel. I'm going to be having an installation of a 125 amp sub panel into my garage soon by an electrician. You have explained a lot on the ones that I have watched. Thank you.

@jaw982 3 жыл бұрын

Love your channel man. I appreciate all the info. Really helps with small repairs here and there.

@ElectricianU 3 жыл бұрын

Glad to hear it! Thanks for watching

@rocksmashergames5476 3 жыл бұрын

@@ElectricianU hey Dustin, I was wondering if you could do a video of wire sizing and the degrees of wiring like 60 Celsius 75 Celsius and 90 Celsius

@kylehill3643 3 жыл бұрын

@@ElectricianU Will any of this advice be useful at all in House Flippers on Steam which looks like it can go pretty deep?

@Chris-kl5rw Жыл бұрын

This guy knows his s#*t! He's a good teacher too. Keep making those videos they help me tremendously.

@flyinthevasoline5181 3 жыл бұрын

Dustin you're my new favorite person to watch on youtube I watch you at the end of the day and it really is great content keep it up man I appreciate it

@jman210210 3 жыл бұрын

Dustin!! Your videos have gotten way better recently, even though they were already great! Someone stepped their game up, I see you..

@Sparky-ww5re 3 ай бұрын

While on the subject of types of circuit breakers, one type which may be worth an honorable mention is an obsolete type known as a delta circuit breaker. This is a three phase breaker that was designed to snap across the two bus bars in a single phase panel, and had an extra lug to accept the high leg conductor on the line side, often smaller than the A and B service conductors such as a 6 or 8 awg copper and usually ran directly from the meter enclosure. This oddball breaker was typically used when there was one three phase load on the service and was prohibited by the 1978 NEC. You may find these in homes built in the mid 20th century that once had a three phase central air conditioner, because many 4 and 5 ton units in the 1950s and 60s were 240 volts 3 phase, they were more reliable and more efficient than single phase models at the time and many of these installations were in the southern US in the more upscale neighborhoods.

@jrg8340 3 жыл бұрын

Shunt trips are also used in clubs or loud places where people are gathered from what I read about. This shuts down the equipment so that an alarm can be heard if an emergency occurs. I guess it’s fire code, haven’t looked into it that far yet.

@nickh2799 2 жыл бұрын

Thank you so much for all this information Dustin I’ve learned so much from you

@lawrencepevitts2434 3 жыл бұрын

Great info, thanks!

@pkrysinski 2 жыл бұрын

Awesome explanation! I also love the "fire pacific" panel in the background.

@DynaDev90 3 жыл бұрын

So crazy we were just talking about breakers today in my WECA class and this video should of been played! I sent the link to everyone in my class! Love the vids man can’t tell you how much they have helped me out in my adventure to becoming a journeyman electrician!

@dashontelamarcus1814 3 жыл бұрын

Your phone listens to you and recommends videos based on your personnalized algorithm

@ThomasDdm Жыл бұрын

@@dashontelamarcus1814 lol

@pappy69pappy Жыл бұрын

You guys sure know how to explain and are really understandable. Thanks

@steve-o6413 3 жыл бұрын

Excellent video filled with a lot of good information, thanks Dustin...

@vince6829 Жыл бұрын

Thank you for sharing your knowledge.

@nrhoofcare7724 Жыл бұрын

Really appreciate your videos man!

@woodlandburl6648 3 жыл бұрын

Great job explaining.

@colintwyning9614 2 жыл бұрын

very informative. Best video on this subject i have seen

@bigpapa615 3 жыл бұрын

Excelent video lots of info, all your videos are great thank you for sharing your knowledge with us I've learned alot watching you

@DaironFrias Жыл бұрын

Thanks a lot for these videos.

@tommycho9068 2 жыл бұрын

Always thanks for giving us great information.

@ahmedm6041 3 жыл бұрын

You are too smart of a master electrician to be ignored ! So consider it subscribed!! Thank you for sharing your expertise..

@glovesoffury1 3 жыл бұрын

Great job doing what you do! Keep it up Id be interested in seeing a video on the new Leviton resi panel

@davidsusanivar6453 3 жыл бұрын

Excellent video! thank you Sir!

@davidsusanivar6453 3 жыл бұрын

Off topic, can you please explain what they call the "common" wire, I will appreciate that.

@getwrxed6218 3 жыл бұрын

I really love your videos dude keep it up!!!

@multiskilledelectrician1 Жыл бұрын

Wealth of information. Keep it up!

@grahamjnrmark6011 3 жыл бұрын

Just found your channel few hrs ago and im glad i found it. Awesome content. Thanks to Coffeezilla i found something genuinely educational. Might take up Electrician ❤

@richardbedard1245 2 жыл бұрын

You got to the nitty gritty, and I actually understood what you were saying. My former job involved troubleshooting and repairing automotive wiring issues. Like some car owner adding extra loads to a wire found under the dash. This would cause the fuse and the wiring to melt. Or the guy that has a short on his 8 amp circuit and installs a 20 amp fuse!

@alexsunder9122 2 жыл бұрын

Oh boy superb content… thank you guys god bless!!

@a.t.7021 2 жыл бұрын

Thank you!!!!

@cwalley8764 3 жыл бұрын

Love the channel man, you put complicated wording of NEC Code into simple explanations with style. Wondering if you ever plan on doing a video about different brands of breakers? Example : Go out on a residential call and a breaker is bad, but the wording and branding names are all removed on the panel and breakers. How can I easily tell breakers apart (Homeline, QO, BR, etc..) and which ones can be used on the other brands panel?

@dronesbydoug 2 жыл бұрын

Beautiful man. Thank you so much. This is so valuable. I am thinking of becoming an electrician. I find this stuff very interesting.

@zjeepgozweeln 2 жыл бұрын

The replacement breakers from Connecticut Electric for most of the brands they carry are a Chinese import branded "UBI" and the ones I've seen are ETL listed not UL(which UL is a little more stringent as I understand). I've had couple of their Zinsco replacement breakers fail and the switching action didn't feel as nice as the originals. I don't know if they've gotten any better, but I've gone back to NOS or used/tested. YMMV. Anyway... I recommend to ALWAYS inspect the buss bar and breaker contacts for corrosion on old panels. Breaker problems can start there with a poor connection. When these panels are hitting the 40-50+ year mark, I'd say they've done their job and maybe it's time to bite the bullet and upgrade to a modern load center that is up to modern code.

@ChrisSmithFMFL. 3 ай бұрын

Thank You. From Fort Myers, FL.

@williamlambert2865 3 жыл бұрын

I like your videos, you are keeping really simple.

@ElectricianU 3 жыл бұрын

I appreciate that!

@johnr5545 2 жыл бұрын

Thanks nice job godbless

@FSAUDIOGUY Жыл бұрын

Just did a job in a really old church. Sub panel said it was from 1968. I was trying to find a 20 amp Quicklag Type C Breaker to add a circuit. No such luck, had to do a work around. I will check the (Breaker Type) FIRST...next time! Learn something new almost every day!

@ericcaumari3957 3 жыл бұрын

Great video thanks for sharing your skill Ihave an old sylvania panel , i had a short circuit in my baseboard heater and the breaker never tripped wire burning , i twisted 2 hot wires on 2 /20 breaker and breaker blow out with big spark is there any problem with old sylvania breaker type qb cu-al thanks

@Gabriel-vz7ml Жыл бұрын

Thank you.

@bulamoves2987 2 жыл бұрын

We had a breaker that kept tripping everyday when we run our room ac units. Roommate had a very old ac and as soon as he got a new one, we had no problems with the breaker tripping. Now i understand why, thermal trip!!!

@Richard-C 3 жыл бұрын

Hi Dustin would like your feed back, i am building a house in the philippines and wondering witch would be better , gfci breakers in the box or gfci outlets for outside plugs , kitchen counters and wash rooms. thanks for the great videos and if you ever loose your pation for the job site consider beeing a teacher you are great 👍👍👍

@allenshepard7992 2 жыл бұрын

I grew up with screw in fuses. You have one of those on your back wall. Also we still have sand fuses and regular fuses for electronic equipment. Yes, I've seen copper pipe beaten down and pushed into the fuse slots to make a switch. Even saw a high voltage fuse with a wire soldered on the outside - fuse was blown and this got the power back on.

@josephzimmerberg1688 3 жыл бұрын

Liking the special effects

@petebowman6275 10 ай бұрын

good information. I wish you would have discussed double pull circuit breakers.

@natescott-id2we Жыл бұрын

Did need to know this...

@jorgerea939 Жыл бұрын

🔌 Hello, great information, I will be taking a browse through your website, 😎

@gringolatino97 3 жыл бұрын

Lots to learn on this topic. What makes an old breaker no good? How old is to old?

@andrizeefoshizee 3 жыл бұрын

Awesome. One of my circuit breakers wobbles side to side quite a bit if I try to wiggle it. Is there a way to tighten it?

@devinclose1600 3 жыл бұрын

@electricianU had a question lately about hooking up a bathroom fan timer. All of them that I'm seeing use stranded aluminum wire that make me hesitant to hook up to existing copper. Why do manufacturers make things with aluminum connections? Do you have any bathroom fan timers that don't use aluminum wire? Looking at Enerlites HET06A-R

@Sanandreasfan 3 жыл бұрын

People in the comments complaining about the hand movements are hilarious. I didn't even notice it until I started reading the complaints. I guess I'm used to people gesturing while talking. Keep it up man, love the videos.

@ivantheterrible7377 3 жыл бұрын

You rock sir.

@arab5911 2 жыл бұрын

I love you man

@joeybez5464 3 жыл бұрын

i noticed zinco types have the plastic concave connections to snap in box but not all the double pole breakers have both metal snap in both slots only one pushed in slot is actually attached? from each breaker ?

@jimharris1590 2 жыл бұрын

Enjoy your segments---I've been doing this for over 50yrs'----if you were handcuffed could you talk? Thanks Jim

@ThomasJackClark Жыл бұрын

A major reason for having a thermal overload trip on a breaker is that it allows for “in-rush” current (start-up current) when a motor is started. When an AC motor is started the initial current draw can be 20 times (or more) the motor’s Full Load Amps (FLA) for the first half cycle (1/120 second). During the first half cycle the motor will start rotating, at that point the starting current drops to somewhere around 4-8 times the normal FLA until the motor is at full speed. Depending upon the motor size, and voltage this can be take anywhere from less than one second to several seconds. If the over current device was not designed to allow a brief overload then you would have a lot of nuisance openings. In working with a lot of motors that were protected by fuses we used slo-blow fuses. They could accept those brief overloads without opening, but continuous overload, (the fuse rating was usually 115% or 125% of the FLA depending upon the motor size) would cause the fuse element to part, opening the circuit. A fast-blow fuse would generally open during motor starting conditions. The reason why can be seen in the following. The specifications on a 3AG type fast acting fuse with ratings of 10 amps or less are that the fuse will open in less than 5 seconds when subjected to 200% over current. In contrast a 3AG type slow-blow fuse (15 amp or less) is rated to allow 200% for a minimum of 5 seconds, but open in a maximum of 30 seconds. Both the fast acting and slow-blow are rated to allow 100% current for 4 hours minimum and 135% current for 1 hour maximum. If my memory is correct I believe that UL 489 specifications for circuit breakers (15A and 20A) are 100% handle rating continuous, 135% for a maximum of 1 hour and 200% for a maximum of 12 seconds, (I could not find my reference to UL 489’s table for different size breakers so I could be mistaken on the 200% time). If I got any of these figures wrong I apologize and would appreciate the correction.

@africanmaan 3 жыл бұрын

Please do a video with Donald Miller. Y'all would make a powerful combo.

@GereDJ2 17 күн бұрын

If you're going to use terms like instantaneous time or trip, you should explain what that means. And, maybe use the word 'capacity' sometimes hen referring to strength, size and rating, etc., of CBs, as it just makes it a bit more clear to us beginners.

@gangren1453 10 ай бұрын

Hi, do you know if there's any standard or practice that requires that circuit breaker can only be connected from rear side? I think it's for safety reason. Thanks.

@Satchmoeddie 3 жыл бұрын

What are Heinemann breakers used for? What is the one place that makes a Heinemann breaker trip from high G shock? How about shunt trip breakers? How about calibrated tap breakers? Oil bath contact breakers? Arc chute breakers? Arc fault? Ground Fault? Ground leakage breakers? Programmable breakers. Poly self resetting breakers. 3 shot breakers. LDO breakers. Airpax breakers (similar to a Heinemann breaker). Set trip breakers. Vacuum breakers. Air breakers. Heavy gas breakers. Light gas breakers. Inert gas breakers. Remote sense breakers. Thermal breakers. NTC thermal breakers. RF thermal breakers.

@Satchmoeddie 3 жыл бұрын

We never never really adopted arc fault breakers in Phoenix AZ. Who uses an electric blanket when it's 120 degrees out and in winter it might get down to 40 degrees outside? NO ONE! I use electric blankets to heat up things that I am testing that have thermal issues to make them fail. NTC breakers are weird. They will trip open or shunt through a resistor until something get up to operating temperature. Imagine the oil in a transmission is like molasses, so the motor will just stall out, until a block heater heats up that oil. Failed block heater and the breaker will trip saving the motor. Heavy gas. Neat stuff. Slow closing and self regulating.

@adamguymon7096 Жыл бұрын

One: Are there breakers that have both GFCI and AFI? Two: Can you please make a video about the differences in the US vs UK breaker and how the same lights in a house and the same plugs in a house would be wired from each type of breaker box as a side-by-side comparison?

@UAANC 3 жыл бұрын

Mark my words he will hit 1M subs if he keeps going.

@yokotaashi 2 жыл бұрын

so is the color of the test button the easiest way to identify what type of breaker it is? Also, is there any way to tell what kind of trip is occurring on a breaker? I ask for troubleshooting purposes.

@oregonsignalfan 5 ай бұрын

hey Dustin, I have a circuit breaker question. Does the magnetic trip funtion depend solely on the amperage or does the voltage also need to be high enough?

@santiagogarcia9436 3 жыл бұрын

I'm loving all this useful info but my only comment is the mixing for the transition music in relation to the volume of your voice, they're very loud and make me have to turn my volume down to not blow my ears off with my headphones then turn it back up when the transition passes to hear your voice😅 I would suggest revising your output volume and gain levels on your music audio and camera audio while editing so they can be more even, that way the transitions can be more transitional and less alarming!

@shivaheeraman1312 3 жыл бұрын

Do you have any info on breaker discrimination in terms of main breaker sizing for subpanels?

@garbo8962 3 жыл бұрын

From an old timer. Kinda remember reading years ago that they test the 15, 20 & 30 amp single pole circuit breakers around a thousand times and the 2 pole 100 amp breakers only 100 times. Been in several machine, tool & die & injection molding shops where they use switch rated ( have SWD ) label 15 & 20 amp circuit breakers to turn on all shop & warehouse luminares ( no such thing in NEC book anymore called a light fixture ) on and off. If they add luminares to existing circuits that causes breakers to run hot shorting their life. Nothing worst then turning off an old obsolete breaker to not being able to reenegize it. Had 2 piece of crap ge garbage 400 amp circuit breakers that would not reset so had to be replaced.

@leanmac6613 11 ай бұрын

Our company, Silicon Valley Breaker and Control does the same thing Connecticut does. Reach out for custom jobs and quick replacements!

@andyyang6078 3 жыл бұрын

Could you show us practice more practical exercises,please

@Newwavegear 3 жыл бұрын

i have a large brother printer which trips by AFCI breaker when it warms up - a friend of a friend who is electrician said that the only way to make this printer work would be to replace this AFCI breaker with DFCI breaker - is that correct?

@poohbears1995 3 жыл бұрын

Can you make a video of why hospital have two different outlet what are they and why? Thank you.

@3828juarez1 2 жыл бұрын

Can you talk about fire hazard panels on recall , here in chicago we’re removing pushomatic, Pannels , house inspectors don’t want to open pushomatic panel they are not allowed they are fire hazard they said

@victortancheongwee Жыл бұрын

It is normal for main circuit breaker to be a little hot at time? Mine once in a while trip, I dont think my appliance is shorted as it could be reset. I think maybe it is too old, mine house is 25 yrs old, Ty

@johnwalters878 Жыл бұрын

Does a “high magnetic” breaker do anything to boost the inrush? I have a car lift that they suggest a high magnetic breaker as it won’t lift a car, lol. My understanding of it is that it just delays the trip but has nothing to do with the rating of say 20 amps?

@dpc727 Жыл бұрын

I have a 30/40 amp breaker attached to a 30/40 amp breaker. The 30's on on the outside. Can you say what this is? Thanks.

@AmaroqStarwind 2 жыл бұрын

Do any household breakers exist that auto-reset?

@isaiashernandez3818 2 жыл бұрын

Could you do a video like this please for transformers?...thank you

@calebmorand4604 3 жыл бұрын

What ka rating should 120 or 240 volt circuit breakers have in residential installations? Thank you.

@Sparky-ww5re 3 ай бұрын

It depends on the available fault current and this is determined by the kVA and impedance rating of the utility transformer , and the length, size and type (copper or aluminum) service conductors from the transformer to the service disconnect. For residential this rarely exceeds 10,000 amps, and if you pay attention you'll find that the majority of 120/240V single phase panels for residential have a 10,000 amp interrupting rating. Once you get into very large custom homes and light commercial with 400 amp and higher services then you start getting into the 22kA interrupting ratings. This is important to know particularly when you're getting into the larger services because a breaker with an inadequate interrupting rating can violently rupture when attempting to clear a fault, injuring or killing someone standing in the vicinity.

@mushroom89 2 жыл бұрын

I'm building a shuttle bus RV and looking into din rail breakers because it seems like I could get away with using much less real estate than a traditional breaker panel box. Is that a European thing? Have any videos on din rail breakers?

@ahamedrassath Жыл бұрын

Can you explain how much current the three phase circuit breakers carry on each phase

@chiccenhawkc 3 жыл бұрын

💯🔥💙👍

@zmettin1994 3 жыл бұрын

Never seen the inside of a home style breaker. Always the case style.

@janicemoses1020 Жыл бұрын

ZINSCO SYLVANIA GTE RC38 30 Amp 2 Pole Circuit Breaker or Zinsco GTE Sylvania 2 Pole Breaker 40 Amp Type RC-38 with 240V PIN can I install the 30 am in stead

@dmgallegos10 3 жыл бұрын

Also Motor Circuit Protectors

@RusredGuTH Жыл бұрын

🙏🙏🙏

@kylegosselin2837 2 жыл бұрын

AYO, shoutout to CT

@jadeelectric2951 3 жыл бұрын

More arm swinging, hand movement and hand gestures. Throw in some high kicks too. Why not use all available limbs?

@busybuzzshop5662 3 жыл бұрын

When adding a sub panel, why is it that the copper and white can't share the same strip?

@bnasty267 3 жыл бұрын

White (neutral) is supposed to have current flow on it, while copper (green/ground) is not normally. If you connected the 2 in a subpanel, the ground would have current flowing on it back to the main panel (sharing the current with the neutral, since electricity takes all paths.) Since ground is not supposed to have current flow except in emergencies, you must keep ground and neutral separate in a subpanel.