@petrockblog said in PowerBlock at powerstrip with switch powers on unintendedly: Does this also happen, if the external hard disks are not connected to the strip? Thanks for your reply. Ah, I forgot to mention that there is another Raspberry Pi 3B+ attached to the powerstrip in a Pi-Desktop housing, again with the original Raspberry power supply for the 3B+ variant. I will watch the behaviour without having other devices attached to the powerstrip. As the spurious power-on takes place only sporadically, it will take some time before I can report observation results.

@jonnykesh you are right. I am an idiot. And i set that every time i set up a pi so i should have remembered that.