Breaktru Forum
eCigarette Forum => Battery => Topic started by: Romelee on February 14, 2014, 05:25:25 AM
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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?
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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 (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 (http://breaktru.com/smf/index.php/topic,723.msg11488.html#msg11488)
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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:
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Wow that hurt my credit card £194.00 on parts fainting:
£194.00
Was that because of the solid GOLD enclosure? :laughing2:
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£194.00
Was that because of the solid GOLD enclosure? :laughing2:
If only ;hubba;
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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.
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Thanks for the info Craig most welcome and good to know for future use ;cheers;
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Maybe next time I'll try some 5A! :yes"