One Circuit Breaker To Rule Them All!

That's an AC breaker not meant for any DC connections.

Meh. I use non-polarized DC rated DIN rail circuit breakers and Class T fuses (with proper covered blocks) in my home solar.

I recently installed one of these and the on off switch is working backwards. If I take it out and reinstall it the other way around will that fix this? Or is the switch working backwards caused by something else?

And if the switch is backwards in its on off function does that inhibit its ability to trip the switch when there's a real surge?

Iphone is made in china😂 most good things made in china. Usa hate china why?

I have a 3500 with , 7000watt surge watt inverter 12 volts , what size breaker should I use . And out is 75 amp charger controller going to grid .

Please kindly send me the calculation of how to know the right breakers to use between battery and inverter etc

I have a 3500W inverter with 6 batteries of 200AMPs running in 24v system can i use a 125A DC breaker?

Yes, maybe rated for 60Vdc and that’s great and important. BUT a really important part to protect against is short circuit. What is the breaking capacity of it in a short circuit situation on 60Vdc it cannot be that great in a miniature breaker compared to right type fuses or the 300A ABB circuit breaker you showed. You test is just an “small” overload test and nice to know, but will it really be able to break the internal arc in a high A short circuit, I think it is not. I am using fuses that can break 25kA at 440Vdc (IEC 60947-2) I know that is probably overkill but high A shorts are really dangerous. Overload should settings in BMS or inverter/charger handle, in my opinion.

Not sure if you know this, That type of breaker does not support stranded wire, you can get terminals. Love your Crimpers!

did u test if it breaks without arcing at 48-60V 125A+ dc= ist that a polarized magnetic quench? thx ;)

Hi been watching your videos. I am building a portable 48v system and space is important. Even though the circuit didn't trip at the intended amperage I could probably use it a disconnect switch since I will still have an inline fuse that will trip if my current is over the intended amperage rating. At least that's my plan but I could use all the advice possible because even though this is not my first Solar generator it is my first 48v system and it's a lot more serious than my small 12v one. Will check your links to try to find these components been doing a lot of purchasing and searching on Amazon but like you mentioned correctly some of the stuff is very questionable and a fire because of a cheap Chinese part is not acceptable so I want to make this build which I have already started but I want to be safe and know it's a Solar generator I can count on in an emergency power outage rather than a potential bomb... lol So I appreciate your videos and anything you may share. Thank you. Your videos are very helpful.

Big battery banks should have T class fuses, as far as I understand these systems, but there is much I don't know...

How did you get your song on there?

This is crap. (competent electrician) use hrc isolator fir your own safety

From the testing that I have been doing, I think it's better to undersize vs. oversize. The fact that these take so long to heat up and trip makes the reasoning for surge pointless.. just use the max continuous load of the inverter plus 1.25 or 80% rule and get it close to that as possible. By time, surge is done with the breaker has no time to heat up the fast enough anyway..

Was the heat internal to the MCB or due to the contact resistance on the terminals? As even just 1mR contact resistance at 150A is 22W. Let me know you thoughts. Thanks.

Poz, the load side to the inverter?
Line side to batts?
Not the other way around.
Does it matter?

Hear is a question ??? if you are using two or more rack batteries with built in breakers, would you still use a breaker on the cable from the batteries to the inverter that can handle the combined load ???

Epic bit of kit

Used for 6 months on solr array. Failed miserably!

Danger: you are showing an AC breaker - NEVER EVER EVER use an AC breaker on a DC circuit. The risk of fire is VERY real, i'm not going to educate you as to why, I'm sure you know how to use google.

Question: Are you using this to break a circuit going to an all in one Growatt charge controller and inverter? If so, can these breakers handle energy flow in both directions? I know there are polarized and non polarized breakers that can handle this but the links provided look to bring me to breakers that have a load and a line side. Am I probably missing something. But thought this might be something others are struggling with too.

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

I thought Western Countries are ahead in terms of technology 😂 , thats old model😂 we have Mcb wifi controlled now 😂

Thanks. So I'm not loosing my mind on why my 2/0 wire doesn't fit. The wire and breaker were sig solar design teams direction. However this combination has provided 3 complications in making connections. Does anyone know of a ferrule, lug, or connector that I could take 2/0 wire and connect with the nader breaker????

What gauge wire are you using? I have 2/0 gauge and the NADER 125 BREAKER and the wire does not fit inside the breaker unless I shaved off a whole bunch of strands

That was an AC breaker on DC. I think that's not safe because DC arcs more. They do make those breakers in DC too though.

Ello the 2big Yello inverter is on fonction?

All circuit breakers have a "percentage of capacity" rating for normal operation. If no rating is specified, they are rated for 80% of capacity for continuous use. This means that a standard 100A breaker can function under 80 amps of continuous loads. If a 100A breaker is rated for 100% continuous loads, then it can handle 100Amps continuously. This is important, since an overloaded breaker can overheat and malfunction.

That breaker is useless and extremely dangerous.

Love your video them nice set up brother 🙂🙂🙂🙂

ATTENTION, Looks like the amazon link in the US also relates to AC 125A mcb's, IEC60947-2 GB14048.2 relate to AC mcb's, don't use them for DC.

ATTENTION, The above amazon link takes you to a different 125A mcb, if you are in Europe / UK, do not buy this item it is for AC use only.

Is that Nader circuit breaker polarity sensitive do you know? Is there any documentation on that, or any markings on the breaker itself to tell one way or another? Would be interested in using one between an inverter/charger and my batteries but it's bi-directional flow, so would need it to be polarity insensitive.

Hi nice video I have a question to ask do you need to add on safety fuses if the battery are Pylontech or Eg4 lifepower thank you..

What is the model number of the ABB breaker you used? You said it was 300 amp. Was that total input (implying 100 per pole) , or 300 per pole?

Nice video, thanks man

The rating on the breaker is for the amps Say 48 volts at 50 amps is then 60 volts at 50 amps in wattage. A 48 VOLT is close enough to not be a lot of different but a 12 volt will be. you would not want a 48 volt on a 12 volt it would over load the system before it trips.If you on the side both can shield thornsof volts.

why did you put e 100 watt resistor on the negative block before you hooked it up?

midnite solar has 100 AMP din rail DC breakers

Nice video. You might spend a moment reviewing DC battery power concerns like short circuit current for your batteries as it relates to using a circuit breaker. In other words can the breaker stop a dead short in addition to an overload. I think it would help us understand. Also, fuses have the same kinds of time dependencies and charts. I think your video really sheds some light on these things and that we should all be thinking about them when choosing our circuit protection. SMA even notes in their manual that the inverter can’t produce enough current to trip more than a 20 amp breaker on the AC output side so the issue turns up on both sides of the inverter. Reasonably priced DC breakers are great

Hey David, is that breaker non-polarized, can it detect current overload in the opposite direction too, like solar charging the batteries at 150+ A through the breaker so you get current protection on the flow in both directions?

Was it too difficult to cut and crimp a new Red battery cable ?

Hello mr david. Greetings from honduras. As i mentioned in another of your videos today is the first day of my eg4ll battery lifepo4 24 volts. I was using agm before using this very same 125 amp circuit breaker.but as i used the battery the circuit breakers trips on me as i start my computer and a electric saw. Should i remove this circuit breaker and get a bigger one?

Any great experience with a certain brand lithium battery?

I thought it was supposed to be a good thing for a circuit breaker to trip quickly and at the rated amps. I mean if there's a danger of wires melting, you don't want to wait and push your luck, right? In other words, the rating should be exactly the amps at which it breaks the circuit in my non-expert opinion. Just trying to understand how all this works.

Why not use a NH00 3P BS fuse switch disconnector ?

T

This is a really bad idea. Wrong breaker. Combining small wires. Running way to hot before the trip. If you have a dead short or other fault on the batteries etc, the current can arc over that type of breaker. All around terrible idea. Just DON’T do it.