Even though the CBs may be more convenient, I'd opt for the Class T fuses because they are current limiting whereas CBs are generally not. In a direct short, the inrush current is huge. The T fuse will clamp that for a brief time and then blow. That works in your favor for heavy motor starting surges as well. I agree with Ray about the Boltswitch products. Well built and hell for stout. Bob-O
On Apr 8, 2013, at 7:13 AM, Ray Walters wrote: I know you said that you would prefer breakers, but I've used Boltswitch pullout disconnects with class T fuses on many systems. In the past 15 years, I've only blown 1 class T fuse, and they do offer better circuit protection. Here's a PDF of some class T rated fused switches that are rated from 200 amp to 1200 amp DC. See the series T models. R.Ray Walters CTO, Solarray, Inc Nabcep Certified PV Installer, Licensed Master Electrician Solar Design Engineer 303 505-8760 On 4/8/2013 7:57 AM, William Dorsett wrote: > Have you tried Eaton/Heinemann breakers? Old number is (410) 546-9778. > They’ve had some jumbo breakers that Trace used to use on their battery > disconnects. > > Bill Dorsett > Manhattan, KS > > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Troy Harvey > Sent: Sunday, April 07, 2013 9:39 PM > To: al...@positiveenergysolar.com; RE-wrenches > Subject: Re: [RE-wrenches] Fuse sizing in battery circuits > > Allan, > > that is a good graph. Thanks. The time vs current is way different than whst > I've seen from fuse charts in the past. > > I'd rather use DC-breakers, but I'm having trouble finding 350AMP DC breakers > for 350MCM cable. Any resources? > > thanks, > > Troy Harvey > --------------------- > Principal Engineer > Heliocentric > 801-453-9434 > tahar...@heliocentric.org > > > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & 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 > <110 bolt switch.pdf>_______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & 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 Change email address & 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