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

[Foxfire Energy]

Contact Square D, they’ll send u a cut sheet.. QO is DC rated

Sent from my iPhone

On Oct 25, 2021, at 9:56 PM, Ray Walters <ray at solarray.com> wrote:



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<mailto: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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