GFCI Leakage Current

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Jerramundi said:
Based on my limited understanding, the only you're getting a reading between Line-Side N (i.e. the CB neutral pigtail) and Load-Side L1/L2, with the breaker handle in the OFF position, is if the breaker is taking power for some other internal components from the LOAD SIDE of L1/L2 as opposed to the line side.

View attachment 2553861
Click to expand...
I would agree. That’s about the only way I can justify everything.

Other posts here are hinting at power coming from the line side of the breaker contacts, but it seems reasonable if it were to come from load side of breaker contacts simply for the fact that it would disconnect all of that circuitry from line power if the breaker was off.
 
The following patent from Siemens on a self-testing GFCI breaker has all of its electronics powered from the load side through a switching supply with a 5VDC output.
So you might be able to measure some resistance from the line terminal on the load side to the neutral pigtail due to this circuitry.

Siemens_GFCI _breaker_patent_8570181B2.png

US8570181B2 - Method and apparatus for supervisory circuit for ground fault circuit interrupt device - Google Patents

An apparatus and method for a supervisory circuit for a ground fault detection device or ground fault circuit interrupt (GFCI) device is disclosed in which is a test stimulus signal for a self test of the GFCI device is generated on a second secondary winding on a toroid of a differential...
patents.google.com
 
synchro said:
The following patent from Siemens on a self-testing GFCI breaker has all of its electronics powered from the load side through a switching supply with a 5VDC output.
So you might be able to measure some resistance from the line terminal on the load side to the neutral pigtail due to this circuitry.

View attachment 2553865

US8570181B2 - Method and apparatus for supervisory circuit for ground fault circuit interrupt device - Google Patents

An apparatus and method for a supervisory circuit for a ground fault detection device or ground fault circuit interrupt (GFCI) device is disclosed in which is a test stimulus signal for a self test of the GFCI device is generated on a second secondary winding on a toroid of a differential...
patents.google.com
Click to expand...

Fascinating. Thank you very much.
 
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