DC breaker box [RE-wrenches]

[William Miller]

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At 06:27 AM 1/29/2005, you wrote:

>Wrenches,
>We need a separate DC load center for general use, so I'm putting out the
>idea here. I have sometimes wished there was an easy way to add DC breakers
>at remote locations, such as a subpanel disconnect for a pressure pump in a
>well pit. The best we have is Square D QO, but that's DC rated only to 50V,
>so it won't work on 48V systems, and John Wiles doesn't like it on 24V
>either (though we use it because it's all we have). But with more 48V
>systems going in, it's becoming more of a problem.


Allan:

I believe John Wiles might complain only if Square D breakers where used 
for PV disconnect in a 24 V system because of the higher OC output of PV 
modules.  For DC distribution, QO and QOU breakers should be OK in a 24 V 
system.  The UL rating for these breakers is 45 VDC and the factory 
certification is for 125 VDC.  If you are not planning on being inspected, 
I have no problem using QOU for 48 VDC systems.

William Miller

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