[RE-wrenches] AC breakers used in DC applications

[Rebekah Hren]

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 HrenNorth Carolina 

http://thecarbonfreehome.com/

--- On Sat, 5/15/10, Kurt Albershardt <info at es-ee.com> wrote:

From: Kurt Albershardt <info at es-ee.com>
Subject: Re: [RE-wrenches] AC breakers used in DC applications
To: "RE-wrenches" <re-wrenches at 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.
 

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 <william at millersolar.com> wrote:

From: William Miller <william at millersolar.com>
Subject: Re: [RE-wrenches] AC breakers used in DC applications
To: "RE-wrenches" <re-wrenches at 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 

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