Components of a GFCI device

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DownRiverGUy

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Canton, MI
Hey guys,

So i'm looking at building a device to detect any leakage current on a 20A single pole device.

I'm thinking a toroid ring with both the hot and neutral in it should give me the reading i'm looking for.

What i'm running into is that I have no clue who would make a toroid ring that could detect .1mA of current :confused:

They have to make them because this is how a GFCI device works right???

Anyone have a manufacture that they know offhand?

All the ones I've looked at so far were for higher power applications (1A+)

Thanks guys :)
 
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