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. On May 13, 2010, at 18:24 , Darryl Thayer wrote: > I thought the Sq.D QO for sizes up to 60 amp was rated for DC? and only the > Square D > Also why not use DC breakers? Robin makes some very small breaker boxes, and > he alos has high voltage breakers, (at least 250 volt? DC) > Darryl > > --- On Thu, 5/13/10, William Miller <will...@millersolar.com> wrote: > > From: William Miller <will...@millersolar.com> > Subject: Re: [RE-wrenches] AC breakers used in DC applications > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Thursday, May 13, 2010, 7:18 PM > > Bill: > > I thought the rule of thumb was: Don't do it. > > William Miller > > > > At 05:10 PM 5/13/2010, you wrote: >> >> Fellow Wrenches, >> >> Some time ago, Windy Dankoff had a rule of thumb to substitute >> (conservatively) an AC breaker for use in a DC application. >> >> Is anybody's memory, or perhaps even the old dog himself; if he is >> listening, better than mine? >> >> TIA, >> >> Bill Loesch >> Solar 1 - Saint Louis Solar >> 314 631 1094 > > -----Inline Attachment Follows----- > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
_______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
