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Understanding circuit breakers
#1
It's been a fairly interesting month trying to understand circuit breakers.

I've been looking at various options and even went down the path of asking on FB for some suggestions.

The recommendation from the group has been so far to look at the S3N (ABB) breakers and ZJBeny, however i am interested in the MCB form factor.

So i wanted to know if its possible to use the ABB S800 125A, 50Ka , Curve B MCB ?

It does state that the rated DC voltage is 250V, so should it be ok for use in 48V applications?

  • Mfr. Part No. 2CCS862001R0845
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#2
(01-06-2020, 07:20 AM)intra Wrote: It's been a fairly interesting month trying to understand circuit breakers.

I've been looking at various options and even went down the path of asking on FB for some suggestions.

The recommendation from the group has been so far to look at the S3N (ABB) breakers and ZJBeny, however i am interested in the MCB form factor.

So i wanted to know if its possible to use the ABB S800 125A, 50Ka , Curve B MCB ?

It does state that the rated DC voltage is 250V, so should it be ok for use in 48V applications?

[*]Mfr. Part No. 2CCS862001R0845
Yes - 250vdc rating is good for 48vdc use.    You don't say what you have in mind for this breaker - is it for battery bank shunt-trip purposes or PV input or battery output consumption?   If you could clarify you will likely get a more helpful response Smile
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#3
Yes its ok. But getting that kind of Ampere inside a normal DIN casing is for me weird Tongue For me those cases are alot larger.. But yes it will work if you even can get the cables inside it.
125A require rather thick wiring Tongue
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#4
(01-06-2020, 03:50 PM)OffGridInTheCity Wrote: [*]Yes - 250vdc rating is good for 48vdc use.    You don't say what you have in mind for this breaker - is it for battery bank shunt-trip purposes or PV input or battery output consumption?   If you could clarify you will likely get a more helpful response Smile
[*]
Hi OffGrid,

Sorry i did forget to add a little more context to the question and where this breaker will go, i intend to use the breaker on the DC side of the system (between the 35mm DC cables from the battery to the DC terminal of the inverter/charger.

I am looking for the corresponding shunt trip module to go with the S800 breaker in this example however like all things its a little hard to trackdown.
  
From what i can understand you need the following shunt trip 
https://new.abb.com/products/2CCS800900R0221/s800-sor130-shunt-operation-release

H
owever the voltage of operation is 48 - 130V  which means that it might not work at low voltage when the battery starts to sag?

Should i be looking at he S200 (assuming it will fit the breaker) which has a operating voltage of 12 - 60v?
  • 2CDS200909R0001
[*]
I can start to see why the S3N is attractive as its all built into the one unit and will most likely fit the cable size as Daromer suggested.
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#5
I’ve been searching this forum for some time tonight for a shunt trip circuit breaker for my leaf wall. It will need to connect to my 48v pack and work with Batrium BMS

I can’t see myself needing more than 125amps DC.

Can anyone in Australia recommend some models and links?
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#6
FYI - I've decided to use an ABB SACE 24v shunt-trip as shown here for my 48v / Batrium system as featured by some trusted experts such as @Daromer, @LithiumSolar etc. In my case I need 400a to support my dual AIMS 12,000watt inverters.


Here's a youtube from @LithiumSolar that I'm basing my actual implementation on.    Connecting an ABB Shunt-Trip Breaker to the Batrium WatchMon 4 BMS - https://youtu.be/5xSFy13AEtQ

I'm not familiar enough with the exact model you show to be of help since I went ABB SACE. 

@Daromer makes an excellent point that physical wiring (4/0 in my case) and the physical size of high-amp shunt-trips such as ABB SACE make it a 'stand-alone' mount on my wall rather than trying to put it into some kind of electrical box.    Notice the ABB to top left and how large it is compared to the 'normal sized' control panels.
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#7
They are Huge compare to China Amps....

But they Will last our lifetime Smile
...
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#8
Thanks - am I correct in guesssing that things about the same cost as my BMS!?
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#9
You can get Them 2nd hand between 60-100usd
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#10
(02-20-2020, 03:36 PM)OffGridInTheCity Wrote: Here's a youtube from @LithiumSolar that I'm basing my actual implementation on.     Connecting an ABB Shunt-Trip Breaker to the Batrium WatchMon 4 BMS - https://youtu.be/5xSFy13AEtQ

That's my video Wink

(02-20-2020, 03:36 PM)OffGridInTheCity Wrote:

You have TWO aims inverters?! Which models? They look like 12kW?
Korishan likes this post
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