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Forum Index : Electronics : Connecting DC breakers

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nickskethisniks
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Joined: 17/10/2017
Location: Belgium
Posts: 405
Posted: 01:42pm 16 Mar 2021
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Hello,

Does it matter a lot how I connect DC breakers?
I was doing some research for a redesign of my off grid powersystem.
Turns out it does matter, so I need to turn it all upside down again in my head.  
But wait current could be negative or positive in my system...help

Something to be aware of:
Breaker on fire
Edited 2021-03-17 00:01 by nickskethisniks
 
brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548
Posted: 10:19pm 16 Mar 2021
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Hi Nickelnick,

Yes, when Solar installations were sort of new , they bought out some DC breakers that disconnected both positive and negative lead.  Was a bit confusing as they had + and -  symbols at the top and bottom of the individual breakers. So the installer had to figure out which way the current flowed ...

I downloaded from the net some fairly easy to understand wiring diagrams, if it helps you.


(All to do with quenching the ARC that occurs in DC disconnect , with supposedly small rare earth magnets fixed adjacent to the breaker contacts)

never did pull one apart ,but if someone has , post a picture, please.

I'm still using mine , and have not had any problems(that I'm aware of ) ...

So, read up all about them and try to digest how they tell you to connect .

Bruce
Bushboy
 
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