For protection of the AC line, on the basis of the information above with
regard to the differential protection integrated in ABB inverters, it is not
necessary to install a type B ground fault switch.
In accordance with article 712.413.1.1.1.2 of Section 712 of IEC Standard 64-8/7, we hereby
declare that, because of their construction, ABB inverters do not inject ground fault direct
currents.
The use of an AC type circuit breaker with differential thermal magnetic protection with trip-
ping current of 500 mA is advisable so as to prevent false tripping, due to the normal capaci-
tive leakage current of photovoltaic modules.
In the case of systems which consist of several inverters connected to a single switch with
differential protection it is recommended that a device is installed which allows the adjustment
of the tripping value and the tripping time.
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