I have done some measurements on the CT, I could pass a precision 1A till 20A pass trough the center of it, with a short Meter at the outside,
First of all the inductance of the CT is about 4H, and there is a bobbin only in a small part of it.
With 2A primary, I got only 800uA secondary
with 10A primary, I got 4.21ma secondary
with 20A primary, I got 8.5ma secondary
The outer diameter is 120mm, it's made of 14 layers of Iron core, each should have a size of 0.35mm, the core al value is 5200nH/turn and to my calculations it should have a 2500 turns of 0.25mm wire!
In the catalog it said it can work with 3A in the middle, the termination resistors are only 6.8 ohm, and the CT's would generate about 1.2ma @ 3A primary, So how the device would be powered? and could measure correctly the Current?
These devices are present on the board and I know that they must consume more than 1mA, 3 MCP6044 op-amp's , one PIC18F46K20, one icl7660 device, the LCD, and some sot23-5 pin parts that I could not find any info on them