5 Planning the installation
Mains and system protection
Installation and Operation Manual for Solar Power Inverter M70A EU V1.1 EN 2020-02-20
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5.6 Mains and system protection
1. The German standard VDE-AR-N 4105 requires external
grid and system protection with a coupling switch for PV
systems larger than 30 kVA.
2. Alternatively, VDE-AR-N 4105 allows the use of an inverter
with an internal coupling switch when this switch discon-
nects the inverter from the grid in less than 100 ms.
This inverter meets the requirement in (2). External grid and sys-
tem protection is not required.
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