Central grid and system protection
Central grid and system protection is required in some countries. This monitors the voltage and frequency in the grid and in the event of a fault, shuts down the photovoltaic systems by means of a circuit breaker.
If your energy supplier requires central grid and system protection for your system, install an external monitoring device, which switches off the inverter via a normally closed contact. An additional circuit breaker is not needed because the shutdown is ensured by the double internal switches in the inverter.