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Breaktru Forum  |  eCigarette Forum  |  Battery  |  Topic: DNA30D & Fuse
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Author Topic: DNA30D & Fuse  (Read 7897 times)

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Offline Romelee

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DNA30D & Fuse
« on: February 14, 2014, 05:25:25 AM »
Hi all,

I have been looking at the thread about fuses and still it baffles me beyond belief, some of it i understand but some of it just confuses me (pardon the pun)

Anyway i am ordering 10 new boxes and 30 tactile switches but i need to order some fuses for the DNA30 board/Battery.

Judging by the fuse thread i am 75% sure these would be ok, they are quite big but i have checked and have enough room for them, but that leaves 25% unsure if they are ok :laughing:

I looked at the 12a fuses and they are way too big so i thought i would use 2 x 6a in parallel to get the 12a.

It's for a single 18650 battery.

Here is the fuse: http://www.digikey.co.uk/product-detail/en/RGEF600-2/RGEF600CT-ND/3592635

Does the fuse seem fine or have i got it completely wrong?

Online Breaktru

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Re: DNA30D & Fuse
« Reply #1 on: February 14, 2014, 07:26:52 AM »
Looks good to me for a leaded PTC for a single battery and two PTC in parallel making the internal resistance of 5mOhm - 9.5mOhm
Here is the spec sheet = http://documents.tycoelectronics.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7FSCD25195%7FC%7Fpdf%7FEnglish%7FENG_SS_SCD25195_C.pdf


See Mamu's write up on fuses: PTC Fuses
« Last Edit: February 20, 2014, 08:29:30 AM by Breaktru »

Offline Romelee

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Re: DNA30D & Fuse
« Reply #2 on: February 14, 2014, 07:48:14 AM »
Cheers Breaktru, so my continuous reading of the fuse thread worked and i picked one that is fine 8)

Wow that hurt my credit card £194.00 on parts fainting:

Online Breaktru

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Re: DNA30D & Fuse
« Reply #3 on: February 14, 2014, 09:47:10 AM »

Wow that hurt my credit card £194.00 on parts fainting:


£194.00
Was that because of the solid GOLD enclosure?  :laughing2:
« Last Edit: February 14, 2014, 09:55:29 AM by Breaktru »

Offline Romelee

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Re: DNA30D & Fuse
« Reply #4 on: February 14, 2014, 12:42:59 PM »
£194.00
Was that because of the solid GOLD enclosure?  :laughing2:

If only ;hubba;

Offline CraigHB

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Re: DNA30D & Fuse
« Reply #5 on: February 14, 2014, 02:27:32 PM »
Those will work, but you can do a little better in terms of size and resistance. 

You can probably go a little lower on the hold current.  Generally if you use a hold current equal to the maximal current, you're good, but you can trim some size if you take the hold current down a bit.  I'd probably go with a couple parallel 4A or 5A hold fuses.  Two 5A fuses in parallel would be equivalent to one 10A fuse, but with considerably less resistance and a smaller profile.

Maximum current demand for a DNA30 is around 12A so the main thing is you want the trip current to be somewhat above that, but not too much or it will reduce the effectiveness of the fuse (increased trip time).  Trip currents are typcially around double the hold current, but not always.  You have to check the part's data sheet.

You can go as low as 6V on the voltage rating and 40A on the current rating.  The one you linked to is 16V and 100A which is higher than required.  Using a part with lower voltage and current ratings will also reduce the size an amount.

Offline Romelee

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Re: DNA30D & Fuse
« Reply #6 on: February 15, 2014, 12:53:07 PM »
Thanks for the info Craig most welcome and good to know for future use ;cheers;

Offline deftones

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Re: DNA30D & Fuse
« Reply #7 on: March 16, 2014, 09:21:22 PM »
Maybe next time I'll try some 5A!  :yes"

Breaktru Forum  |  eCigarette Forum  |  Battery  |  Topic: DNA30D & Fuse
 

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