Hi all I want to make a circuit that can give any kind of signal or indication when current through a wire increases above a particular value... any ideas??

 

Read this data sheet for the ZXCT1009. There are a family of similar chips at Diodes Inc...

What is the voltage/current of the circuit being monitored?

What kind of output do you want?

 

For higher amounts of current, there are these:

http://www.clamp-meter.net/power/meter-amp.html

Edit: Lucky guess.

 

Thanks for replying, I am working around 230 V (RMS) and 25 amperes.

 

Thanks for replying, I am working around 230 V (RMS) and 25 amperes.

Then forget the IC I linked to. You will need a current transformer, a burden resistor, a precision rectifier, and finally some filtering, for a home made solution. The alternative is to buy a calibrated AC Amps to DC transducer

 

Use a fuse at the appropriate current. Also use an indicating fuse holder that lights up when the fuse is blown.

Wa La...
"when current through a wire increases above a particular value" the fuse will blow.
When the fuse blows the fuse holder indicator will light and " give any kind of signal or indication"

Elegant and simple based on your needs.

 

These work well.