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.