PTC fuses

[RicModMaker]

Hopefully someone can clarify for me.
I've got got PTC fuses that say they are 10a but on the specs it says the holding current is 10a and the tripping current is 18a and the carrying current is 100a.
Anyone clarify for me please. sparkyjuice?
Thanks in advance.
PTC Resettable Fuse 10A AGRF1000

 

[fasteddie600]

Been looking all week at same stuff seedy! I am as confused as you, I did find one that was designed for lipo packs which was something like 30A holding 50A break. It's the speed of these that I was thinking could be an issue too. Hopefully we will find a decent fuse solution!


Sent from somewhere inside a huge cloud!

 

[fasteddie600]

http://www.farnell.com/datasheets/1794129.pdf

Spotted these earlier in the week, not sure if they are any good though?

I think I will be ordering these one's- Service Unavailable

 

[Danny K]

Hopefully someone can clarify for me.
I've got got PTC fuses that say they are 10a but on the specs it says the holding current is 10a and the tripping current is 18a and the carrying current is 100a.
Anyone clarify for me please. sparkyjuice?
Thanks in advance.
PTC Resettable Fuse 10A AGRF1000

Holding current is the power needed to stay "On" so 10a is power required for operation.
Trip current is what the device will trip at in this case 18a it will go shutdown and protect.

My understanding of carrying current is what it is capable of taking but I'm not that clued up on this part.



Sent from my D2303 using Planet of the Vapes mobile app

 

[RicModMaker]

Holding current is the power needed to stay "On" so 10a is power required for operation.
Trip current is what the device will trip at in this case 18a it will go shutdown and protect.

My understanding of carrying current is what it is capable of taking but I'm not that clued up on this part.



Sent from my D2303 using Planet of the Vapes mobile app

Thanks for the input but the fuse is always on until it's tripped. If I get my multimeter, and connect it to the fuse, it is on so I'm a bit confused what the 10a bit means.

 

[Vaping Bad]

IIRC the different levels are to do with spiky vs flat loads, eCig should be a flat load and the higher number would be applicable, but don't quote me on it, no expert.

 

[Loco]

Read up quite a bit on these. Hold current is just max current to run through them efficiently. Trip is when it kicks in fully to interupt the current.

Some electrical voodoo stuff goes on when it trips.... with expanding polymers, resisting the current....


Id imagine if you exceed the holding current, the resistance will begin to raise to some degree.

 

[Loco]

https://www.sparkfun.com/products/8357

A few comments down, someone asks the same question....

My answer seems right,

 

[RicModMaker]

For once, I seem to have bought the right thing. Im almost finished building my dual 18650 series mosfet build and all seems fine although I haven't tried tripping the fuse yet. I might do a stupidly low ohm build to pull something like 25a and see if it works.
Thanks guys.

 

[RicModMaker]

That said, I just tried ohms law calculator to see what resistance I would need and I don't think I can get that low.