Hi Rebekah, The 48v is a max rating not a nominal rating. So yes only good for 12 and 24v systems.
However with CBI breakers I don't understand why the need for QO for DC anymore? jay peltz power On May 15, 2010, at 6:28 AM, Rebekah Hren wrote: > Hi, > One thing to be clear about is whether these are listed for "48 volt > systems," or for max 48 volts? > I was under the impression that they were max 48 volts, meaning you really > shouldn't use them on a system >24volts nominal. > > Rebekah Hren > North Carolina > > > > http://thecarbonfreehome.com/ > > --- On Sat, 5/15/10, Kurt Albershardt <i...@es-ee.com> wrote: > > From: Kurt Albershardt <i...@es-ee.com> > Subject: Re: [RE-wrenches] AC breakers used in DC applications > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Saturday, May 15, 2010, 12:59 AM > > The Square-D catalogs are marginally clear on which breakers are listed for > DC and for what voltages, but when I tried to select an appropriate load > center for a DC application earlier this year I quickly ran into a number of > conflicts in their catalogs. Here is the response from Schneider tech > support (Case# 4845778 on 1/19/10 in case anyone runs into problems with an > inspector): > > > > The load center catalog numbers listed below are UL LISTED, File E6294, for > use on 48 V dc systems. The load centers listed ARE NOT MARKED for use on > this voltage system, however are suitable for the application. QO branch > breakers, 10-70 ampere (1 and 2 pole) are also UL LISTED for use on 48V dc > systems. Short circuit current rating is limited to 5,000 amperes when used > on 48V dc. > QO24L70F, S or RB QO612L100F, S, DF, DS, DFCU, DSCU, RB, TRB or RBCU > QO816L100F, S, DF, DS, DFCU, DSCU, RB or RBCU > QO112L125G or QO11224L125G QO116L125G QO11624L125G QO120L125G QO12024L125G > QO124L125G or QO12030L150G QO124L150G QO130L150G or QO112L200G or QO130L200G > or QO13040L200G QO142L225G or > GRB or GRB > or GRB > GRB > GRB GRB GRB or GRB QO142L225GRB > > > I can email the PDF to anyone who needs a copy. > >
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