A conventional mechanical breaker does not have that problem. Even breaking 
400,000 Volts can be done without that extra energy, but it may be little 
ionizing issues.

http://www.youtube.com/watch?v=hIkNY5xjy5k&feature=related

/Inge



----- Original Message ----- 
From: "Thayer, Wayne - IIW" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 28, 2009 10:59 PM
Subject: Re: [TN] Looking for a way to fuse a 20 milliamp wire


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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