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Breaktru Forum  |  eCigarette Forum  |  Battery  |  Topic: Electricians view required on fuses
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Author Topic: Electricians view required on fuses  (Read 5490 times)

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Offline Romelee

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Electricians view required on fuses
« on: January 06, 2014, 02:33:28 PM »
I was wondering if an electrician could shed some light on the below:

The fuse: http://uk.rs-online.com/web/p/resettable-wire-ended-fuses/5176916/

Can I/we assume that this fuse works by heating up when there is too much current going though it and thus in a closed environment such as a boxmod (aluminium) would cause melting of wires (and maybe the battery next to it) if it takes to long to open up the box and get the battery out?

A) In a mod where space is limited, could/would you recommend another type of fuse that is resettable or easily replaceable?
B) In a mod where the board itself has an input limit of 7 amps, would a fuse matter?

Offline CraigHB

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Re: Electricians view required on fuses
« Reply #1 on: January 06, 2014, 05:26:46 PM »
We're having a pretty big discussionion on PTC fuses right now in this thread;

http://breaktru.com/smf/index.php/topic,723.msg10896.html

Might answer some questions for you. 

Yes, PTC fuses are heat driven devices.  Under normal conditions they remain cool and maintain a very low resistance.  When currents approach a "trip current", they heat up causing resistance to go up.  It gets high enough to limit current flow to a tenth of an Amp or so. 

They do not work in the traditional sense of a circuit breaker type of fuse.  They don't break the circuit, but in effect, they accomplish the same thing by protecting components from excessive currents.  This is especially improtant for Li-Ion batteries that can super heat and ignite when exposed to short circuits for a length of time.

Offline aflex

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Re: Electricians view required on fuses
« Reply #2 on: January 09, 2014, 05:14:51 AM »
PTC added a new alternative to protect circuit. One can now choose traditional fuse or PTC depending on the electric flow.

Offline Visus

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Re: Electricians view required on fuses
« Reply #3 on: January 28, 2014, 12:03:52 AM »
Electronics guy not electrician we use fuses that start out the size of your thumb to as big as you leg..  We mostly  do not do electronics lol
people always assume we also know electronics..  26 yrs electrician but electronics, its all new to me..  When we solder its called sweating and it's with a torch and rod, a lug sometimes as big as your fist..   raged:

Ratings work so different on electronics.  We count sources add em up to common isolate between 15 to 20 amps or a very rare 30 amp.  lol  In commercial we start common @ 20 amps and 60 amps is highest used there except in machining factories..

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