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@BalooUriza
If your question is "where is the device that guarantees the inverter cuts off if it loses connection to the grid", it's internal to the inverter. All grid tie inverters should have this function.
I don't know the detailed German spec for these things but the British one is Engineering Recommendation G98.
https://dcode.org.uk/assets/250307ena-erec-g98-issue-2-(2025).pdf
@BalooUriza @pfriedma @f4grx @balkonsolar
A grid-tied solar PV inverter isn't like a gas generator. It follows the grid waveform and will cut out within one cycle if the grid is lost. Unplugging the inverter, the plug is dead before the pins are exposed to be touched.
At 230V, 800W (the German limit for plugin solar) is ~3.5A. The German electrical regulator has deemed that a typical 16A power circuit wired in 1.5 sq.mm. cable will still be safe with 3.5A of current fed from the "wrong end".