<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hi,<div>One thing to be clear about is whether these are listed for "48 volt systems," or for max 48 volts?</div><div>I was under the impression that they were max 48 volts, meaning you really shouldn't use them on a system >24volts nominal.</div><div><br></div><div>Rebekah Hren</div><div>North Carolina</div><div> <div><br><br>http://thecarbonfreehome.com/<br><br>--- On <b>Sat, 5/15/10, Kurt Albershardt <i><info@es-ee.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Kurt Albershardt <info@es-ee.com><br>Subject: Re: [RE-wrenches] AC breakers used in DC applications<br>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><br>Date: Saturday, May 15, 2010, 12:59 AM<br><br><div id="yiv787743009"><div>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):</div><div><br></div><div><br></div><div><br></div>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.<br>QO24L70F, S or RB QO612L100F, S, DF, DS, DFCU, DSCU, RB, TRB or RBCU QO816L100F, S, DF, DS, DFCU, DSCU, RB or RBCU<br>QO112L125G or QO11224L125G QO116L125G QO11624L125G QO120L125G
QO12024L125G QO124L125G or QO12030L150G QO124L150G QO130L150G or QO112L200G or QO130L200G or QO13040L200G QO142L225G or<br>GRB or GRB<br>or GRB<br>GRB<br><div>GRB GRB GRB or GRB QO142L225GRB</div><div><br></div><div><br></div><div>I can email the PDF to anyone who needs a copy.</div><div><br></div><div> </div><div><br></div><br><div><div>On May 13, 2010, at 18:24 , Darryl Thayer wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit;">I thought the Sq.D QO for sizes up to 60 amp was rated for DC? and only the Square D <br>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)<br>Darryl<br><br>--- On <b>Thu, 5/13/10, William Miller <i><<a rel="nofollow" ymailto="mailto:william@millersolar.com" target="_blank"
href="/mc/compose?to=william@millersolar.com">william@millersolar.com</a>></i></b> wrote:<br><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;"><br>From: William Miller <<a rel="nofollow" ymailto="mailto:william@millersolar.com" target="_blank" href="/mc/compose?to=william@millersolar.com">william@millersolar.com</a>><br>Subject: Re: [RE-wrenches] AC breakers used in DC applications<br>To: "RE-wrenches" <<a rel="nofollow" ymailto="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" href="/mc/compose?to=re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>Date: Thursday, May 13, 2010, 7:18 PM<br><br><div id="yiv876483802">
<font size="3">Bill:<br><br>
I thought the rule of thumb was: Don't do it.<br><br>
William Miller<br><br>
<br><br>
At 05:10 PM 5/13/2010, you wrote:<br>
</font><blockquote type="cite" class="cite" cite=""><font size="3"> <br>
</font><font size="3" face="arial">Fellow Wrenches,<br>
</font> <br>
<font size="3" face="arial">Some time ago, Windy Dankoff had a rule of
thumb to substitute (conservatively) an AC breaker for use in a DC
application. <br>
</font> <br>
<font size="3" face="arial">Is anybody's memory, or perhaps even the old
dog himself; if he is listening, better than mine?<br>
</font> <br>
<font size="3" face="arial">TIA,<br>
</font> <br>
<font size="3" face="arial">Bill Loesch<br>
Solar 1 - Saint Louis Solar<br>
314 631 1094</font></blockquote>
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