AC Vs DC Circuit Breakers: The importance of the DC ARC Extinguisher 

Worth noting that a lot of DC MCBs have magnetic arc suppression where a magnet directs the arc into the suppression chamber. These breakers have + and - indicated on the terminals and the polarity should match the source of fault current.

Another great Vlog, I love the way you teach this so clearly and with good picture demonstrations. Thank you for do these Vlogs

Look into the datasheets of normal MCBs like from ABB and Schneider etc. Most are rated for DC too, but only up to ~50 or 60Vdc I'd rather trust an ABB breaker on my 48V battery bank than some of those rebranded cheapo chinese breakers

One Of The Best Technical Clarification Videos I have come across !! Great Clarity Clear Explanation !! Many Thanks and Best Wishes !!

I rly thank you You helped me to understand the difference between ac&dc c. b

Jesse's second half keeps him in step. 😁

I have been self-educating for years on solar energy through resources on the Internet, but I can attest to the fact that your channel is by far the most valuable channel on renewable energy that I have come across. I can't wait to register for your course very soon. Thank you so much.

as usual simply and most clearly explained..well done..keep on this great spirit

Nice, that was really easy to understand. That arc chamber is really cool.

Good video. Do you also have videos that explains the difference between Polarized and Non-Polarized DC circuit breaker and why the polarized circuit breaker will catch on fire if polarity is not observed?

Very clean explanation.

What a useful, clear and excellent video! Thanks!

Amazing explanation and easy to understand. Again, Thank you for sharing your expertise!

You are hilarious. And I truly enjoy the videos were you "geek-out" a bit more and if some want to by-pass that you give the timestamp to jump to. Perfect!

Indeed, your teaching ability and patience in your explanations makes you a superb guide, thank you

Thank you very much for detailed overview! Very nice video!

Great stuff, loved watching, thank you

Thanx Doc, I learn a lot from your utuber vids!

Great video, pretty reasonable and logical, i am in love with ur teaching.

Thank you sir, very thru n thru explanation

Thank you! Very well explained.

I like magnetic Breakers because there's no time delay they simply trip based on the amount of magnetic flux in the breaker mechanism.

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thanks for posting this ❤️

Great vid, good info & content, thanks for this tutorial. Another commenter asked about what type of breaker switch is best advised between an All In One system and the battery, as either side becomes a source between charging and discharging events. I have 48v & 24v AIO systems I am implementing for different projects, (bus, shed, house), so this should be a dual pole 150A-250A ‘NO ARK’ type DC switch I am guessing for 10kw-15kw lifepo4 battery bank, does this sound about right? Cheers

Superb information 👍

Would you please tell us about connecting the DC circuit breaker according to their polarity . I mean + and - signs that are written on it.. Thank you

Great video, thank you.

Thanks for a very good and informative video.

Thank you,you are the best !!!

Great video thanks very much. 🇬🇧

I appreciate this great illustration. My confusion occurs with (NEC-type) Safety Regs for DC circuits. Circuit Breakers have the arc extinguishing chambers, as I understand, while I have read that Isolator (rotary) Switches do Not. Yet, NEC codes require Isolator Switches for DC arrays. So … for a Small (2 panel) system, is it Best practice to have Fuses between panel & MPPT, plus Isolator, plus Breaker … or which combination thereof, or only one …. ? I have also read that as long as the current specs of my panel is BELOW my MPPT, I really don’t need (any) ….. now it should seem Clear how easily one can become Confused …. 🤷🏻‍♂️

Good video. God bless you

There are still many polarised breakers around with magnets to move the spark into the extinguishing champer. If they are connected with wrong polarisation they catch on fire. The flow of current must be correct from + to -. If the source comes from bellow into double breakers, the + must be connected to the side where a - symbol is printed on top of the breaker shematic.

lekker handig!!

6a 230v fuse blows about 14a 12v

Very Good & Thank you ! I’m a DIYer attempting to design and implicate Battery Back up for if and when the grid goes down which it does every few years where I live . My breaker box is a normal 1 - 120v @ 100A 20 or so Circuit breakers & I’ve only got 1 - 220v Circuit my central AC what shift the grid goes down we’re not using central AC we could use fans That’s not the point my Inverta is a 5 kVA 230v charge controller 48v my battery banks are 15 pease 3.2v 280Ah lithium phosphate Daily 15s 120A BMS & 20 peace 2.3v 40Ah ithium titanate batteries ANT 20s 100A BMS “ my Inverta 230 V would like to used to hotline which is 115 V the neutral line is 115 V all still single phase can I put on a 230 V single into a double pole breaker both the L one hotline 115 V and the neutral which is 115 V to make my breaker box single phase at 115 V for a battery back up if the grid goes down and I have the solar inverter that can slowly charge by Lithia batteries very slowly ! So what I want to do run both powerlines to a double pole breaker both the hotline in the neutral because each are 115 V in the ground would be to an earth ground but then what would I use for a neutral if I’m using the neutral as a hotline but then what do you use when you use in a 230 V for a neutral because there is no neutral you just have two hotlines & a ground ? I would greatly appreciate in your convenience if you could just jot down your ideas and your wisdom !

Hi - the video on explanation of how the DC and AC MB'Cs function is great - however - the speaker does "NOT" mention the consequences of arcing - the breaker, be it small in size or larger ACB's - one cannot operate the breaker beyond the contact rating as a result of ongoing tripping. If a any breaker has exceeded the contact capability, the breaker under fault conditions will explode - he does not mention this - very confusing as opening/closing/opening etc. under specific fault levels will cause the MCB/ACB to explode. This is where a "ductor" test should be conducted - this checks the condition of the contacts. The breaker would inevitably fail after several trips - this is a short comment to a much longer discussion. Thank you. Richard Murphy (Pr Eng)

My all in one inverter wants a 2 pole 200 amp breaker going to the battery bank, and a 2 pole 16 amp breaker going to the solar panels. Why can't I find these anywhere online or in-person? Does it go by a different name? I would even pay just to find out where to buy them!

Nice.

can i use dc breaker instead ac breaker?

Hi, i have a 3500w 24v inverter with 2 batteries ( 200amp each) my dc breaker is SPV-125 C80 (500v) and 6000 A i need to add 4 extra batteries of 200 amp each so the total is 6 , do i need to change my breaker to a bigger one or not? Thank you in advance.

Nice background ;)

Hi, is this dc circuit breaker enough to protect Lifepo4 batteries or should it be combined with fuses?

thankyou.

I love having the ex Governator teach me about electronics Hope you'll be back

Love it

Hi, I am new to solar DIY, and I have a question... I understand some DC breaker are direction sensitive (eg. if top side is source then bottom is load or vice versa)... my question is when I try to connect my hybrid inverter to the battery, which side is source and which is load.?? Because if the solar charging is active then my Inverter is the source and my battery is load, and if the inverter is active then my battery is the source and my inverter is load.. Thanks...

Hello sir can you provide any report file on your off grid solar energy online course

Is there a way to know if a DC breaker is polarized ? Some have a + and - symbol but there is confusion if a breaker is polarized or not

Which is the next video?

I believe the circuit breaker is shown upside down. If you turn it around so the arc extinguisher is at top it makes more sense. The hot arc travels up (hot air) and such the extinguisher does its job. Having it on the bottom completely negates its presence.

Magnets are also used in dc circuit breakers to circumvent the arc 👍🏽

Are there DC relays? for,say 120 VDC ?

Continuesly told solar customers not to use the DC breaker to turn off array under load - emergency only. Use AC only. I really want to try arc welding from my 10kW battery bank.. Shhh

they use only 2 fase and the nuetral and ground is the same thing. that is danger.

👌🇦🇺

Love from Pakistan

electric system in the united state is the worse system that I ever saw in my live

He doesn't even mention permanent magnets built into DC circuit breakers. He talks about 2 major strategies: larger contact distance and biefier arc distinguishing chamber. But he doesnt mention a permanent magnet, which implies, that a DC CB has a polarity! Thumbs down, sorry.