Quite true. It's a simple matter of energy conservation--it takes energy to break a wire! And when you are talking about a few milliamps the voltage drop would have to be large to provide this energy.
Look into a smart circuit breaker like Inge is suggesting.
Another possibility might be a positive temperature coefficient thermistor--the resistance increases linearly with temperature, so it will tend to cause the current to drop, regulating the load current. I don't know if one is available with the characteristics you might need.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Wednesday, October 28, 2009 5:41 PM
To: [log in to unmask]
Subject: Re: [TN] Looking for a way to fuse a 20 milliamp wire
Evev a tiny tin whisker is to coarse, and a 1 mil bond wire will need amps to break. You need a cmos switch.
/Inge
----- Original Message -----
From: "Robert Kondner" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 28, 2009 10:24 PM
Subject: Re: [TN] Looking for a way to fuse a 20 milliamp wire
> Hi,
>
> How fast and why not use a circuit?
>
> I would guess it does not need to break 10K Amps at 250VAC. How much
> resistance can you tolerate?
>
> Bob Kondner
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Barbara Burcham
> Sent: Wednesday, October 28, 2009 4:51 PM
> To: [log in to unmask]
> Subject: [TN] Looking for a way to fuse a 20 milliamp wire
>
> Hey Y'all,
> I am fishing for ideas here...
> I have a need a fuse that would blow at 2 milAmps current.
> A part?
> A trace?
> A tiny wire?
> Any ideas?
>
> Thanks,
> Barbara
>
>
> Barbara Burcham, C.I.D.
>
> *pcb* Trace Design
>
> 1022 Plantation Drive
>
> Richmond, TX 77406
>
> [log in to unmask]
>
> 281-341-7539
>
> 713-249-7718 Cell
>
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