[RE-wrenches] DC Rating of Square D QO?

[Ray Walters]

I've got some old systems running the QO breakers at 48 v nominal, but 
the Voc of the array could be over 80.  Never an issue, but I agree just 
swap out that load center, since its that old.  Midnite has good stuff.  
If you're just running to a an FM80 or similar with 150 v limit, their 
regular breakers are 150 vdc rated. I only use the 300 v rated breakers 
with the new FM 100 that can take 300 vdc.

Ray Walters
Remote Solar

On 10/25/2021 6:45 PM, Chris Sparadeo wrote:
> Hi Jeremy,
>
> According to the QO cut sheet the answer is 48VDC:
>
> https://download.schneider-electric.com/files?p_Doc_Ref=0730CT9801
>
> My guess is that your string voltage would be much greater than that. 
> Not sure your exact application, but for the slight added cost, I 
> would definitely suggest using a reputable NEMA3R combiner/disco with 
> 300VDC breakers and throwing away the ancient load center.
>
>
>
>
> On Mon, Oct 25, 2021 at 8:30 PM Jeremy Rodriguez 
> <allsolarjeremy at msn.com> wrote:
>
>     Hello
>     Does anyone have a definitive answer to the DC rating of the QO
>     circuit breakers?   I’ve got a potential client with an existing
>     AC load center (>20 yrs) being used for his array combiner.
>     He’s looking to add to the array, with modules that are higher
>     voltage of course.
>     Thanks in advance.
>
>     Jeremy Rodriguez
>     Solar Installation / Design Expert
>     All Solar, Inc.
>     1453 M St
>     Penrose Colorado 81240
>
>     Sent by Jeremy's iPhone. Sorry for typos and shorthand.
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