[RE-wrenches] Fuse for 48 V DC

[Drake]

I guess I will go with the 250 V glass fuses. For 
24 V systems, DC fuses are readily available at 
auto parts stores. It seems wonkey to use fuses 
not rated for DC applications, but if they hold at 144 VDC, I'm sold.

There is no code issue at present. Has anyone had 
problems with inspectors using these.

Thanks to all who shared their knowledge, on and off the list.

Drake


At 02:51 PM 5/24/2017, you wrote:
>Content-Type: multipart/alternative;
>  boundary="------------8DE54A1A6E5488D0D6697B6F"
>Content-Language: en-US
>
>We've used the inline glass fuses for metering 
>and battery fan applications for 20 years 
>without trouble.  I certainly wouldn't use them 
>over 5 amps though.  I actually tested these 
>inline fuses on a 144 vdc vehicle battery bank 
>once, and they blew without arcing or 
>burning.  Of Course my name is not 
>UL.  However, this is also the fuse that comes 
>with Trimetric, Victron E-meters, and the Zephyr 
>power vents, currently. Also, glass fuses were 
>used in many DC power centers back in the day, 
>so they have a long and proven track record in 
>the 48 v dc solar industry for low amp applications.
>
>I found a standard fuse holder from Grainger 
>that is rated for 300 Vdc.  The regular AGC 
>fuse does not list a DC rating, which is odd, 
>since it is used for DC all the time.  The ABC 
>fuses are listed to 125 vdc and are fast acting.
>
><http://www.cooperindustries.com/content/public/en/bussmann/electrical/products/electronic_smalldimension/elx_1_4_x_1-1_4_/abc.brands.cooper_bussmann.html>http://www.cooperindustries.com/content/public/en/bussmann/electrical/products/electronic_smalldimension/elx_1_4_x_1-1_4_/abc.brands.cooper_bussmann.html
>
>R. Ray Walters
>Chief Technical Officer, RemoteSolar.com
>BS Mech Engineering, 1988
>Former NABCEP Certified, 2004-2016
>Licensed Master ELectrician, Colorado
>303 505-8760On 5/24/17 12:18 PM, Jeremy Rodriguez wrote:
>>How about Midnite din mount 150vdc breakers. 1-63 amp range.Â
>>
>>Jeremy RodriguezÂ
>>Solar Installation And Design ExpertÂ
>>All Solar, Inc.
>>1463 M St
>>Penrose Colorado 81240
>>
>>Sent by Jeremy's iPhone. Sorry for typos and shorthand!
>>
>>On May 24, 2017, at 11:59 AM, Drake 
>><<mailto:drake.chamberlin at redwoodalliance.org>drake.chamberlin at redwoodalliance.org> 
>>wrote:
>>
>>>Hello Wrenches,
>>>
>>>I'm looking for in line fuse and fuse holders 
>>>for a 48 VDC systems in the 1 - 4 Amp rating. 
>>>The systems can go 67 VDC.  FRN-R fuses have 
>>>this rating but are slow blow, 8 seconds at 500% current rating.
>>>
>>>Is a glass fuse and in line fuse holder, 
>>>listed for this voltage and amperage, 
>>>available anywhere? It seem that the default 
>>>is to use 250 VAC glass fuses and holders, 
>>>which seems like a questionable practice to me.
>>>
>>>Drake
>>>
>>>Drake Chamberlin
>>>Athens Electric LLC
>>>OH License 44810
>>>CO License 3773
>>>NABCEP Certified Solar PV
>>>740-448-7328
>>><http://athens-electric.com/>http://athens-electric.com/
>>>
>>>
>>>
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