The sensitivity should be 30mA but in practice it seems significantly lower, resulting in constant tripping.

All houses have a small leakage. In mine, it plays at around 11mA - 15mA.

Unfortunately, I had to replace it with another leakage relay that does the job and I don't have power outages, but it was significantly more expensive and both Gacia relays end up sitting, essentially losing money.

Since I tried 2 relays and they had the same issue while the third one of a different brand didn't have it, I can narrow down the problem to Gacia relays. Nevertheless, because the batch could have been defective, I hold a reservation and rate it with 2 stars.

The RCBO is of type AC with an C curve. In a quick test I conducted, the trip times were within acceptable limits. When I find time, I will test the thermal/magnetic component and provide a more detailed feedback. Overall, for its price, it shows decent quality material. But as always, time will tell

I have nothing good to say.
The quality is terrible.
And of course, you can't play around with quality like this.
And I was surprised by the price difference compared to legrand hager abb.
But what do I know...

After a sudden shutdown by the power company and as I was resetting the power supply, it burned the helical relay it had

It works properly and it is also beautiful

The leakage relay is of AC type.
Type B is the characteristic activation curve for short circuits (magnetic element).
Otherwise, decent material, time will tell.