AT-SY1-TSW DIN Rail WiFi Smart Circuit Breaker (BK7238) Power Metering

Hi,

Here I will add another DIN rail switch device.




Device name is TUYA WIFI Smart Circuit Breaker Power Metering. It seems to be quite popular on aliexpress now.
The store says it support up to 63A, the text on relay says 40A, so I hope it will handle my 16A.



Inside we can see main board with soldered chip, analog 100K thermistor, and interesting magnetic relay, that can be fixed in both states.
Here is inside of the relay



I have removed the chip from main board and flashed it with GUI tool. Seems like it can be flashed without detouching.
Important thing is to enable Bridge driver so the relay do not overheat.

Power metering should be calibrated with


Here goes the template:


And here is autoexec:


The only thing I haven't figured is how to read the analog pin and convert it to the temperature, but I dont really need it.

https://github.com/OpenBekenIOT/webapp/commit/77fc6062b8019eef9abd2417395cc2fe33fd63ad

boot log from your Tuya backup file

Whoa, we would really need to reverse-engineer the inside of this thing, especially the current-sensing part. It couldn't be junkier inside; be careful with that thing!
My confidence level from 1 to 5 is closer to 1 than anything! This should be a circuit breaker after all!

Hey, this thing is not a circuit breaker, but a relay with metering option.
You can program the current limit on this one, but generally should use a regular circuit breaker along with it.

>>21855167 Oh, then it's another story, I see the BL0942 now! In one of the AliExpress products I saw "Trip time" so I was assuming it's a breaker! I should be comparing the items.