Zogdan wrote: Just a small warning on quality:
I bought a few more of these devices, and they all have the same problem with measuring leak current.
The RCD function (Residual Current Device) of the EAMPDW-TY63 is unusable and you should not rely on that as a protection device, since it consistently reads too high values, tripping the set protection. If readings are so much all over the place you might wonder if it is reading anything useful, so I just switch it off...
For completeness or those searching : the printed sticker says EARU EAMPDW-TY-63
Hello
@Zogdan and rest of topic followers.
I understand the quoted post is old, but just in case you didn't solve the problem and/or others are having the same.
From the photos in
your previous post:
I can see the current transformer for leakage current (toroidal yellow part top left of the photo) is only measuring one of the poles, so, logically, it is showing a very high current (in fact, it's measuring the phase current). To measure leakage current (i.e., the difference between the phase and neutral currents), it should encompass the two poles: the one that goes through the relay and the other one, which has the current shunt (the one in the lower part of the case in your photo).
I'm not sure if it came mounted like that from the factory or if it was due to your teardown. As you mentioned, you bought and tested a few more, and if you tested them before opening, I understand it's the first possibility, which would indicate very poor quality control. From the photos, it may be a bit tricky to put it correctly, but it should surely be possible.
Hope this helps if you're still monitoring the thread.
Regarding using this as a protection device, I'd rather trust my life to a "traditional" RCD, approved for use by local regulations (in my country it's mandatory to have a 30 mA unit upstream every 5 circuits), but this kind of device could still be useful to measure residual currents in individual circuits and/or tripping at lower levels than the one upstream, if you want to have a more sensible protection for some reason (e.g., a test panel in a lab).
EDIT: in the second photo of your teardown
here:
You can see how the residual current transformer (black in this one) is surrounding both poles, This is the correct way to install it to measure the difference between input and output currents.
