Wels, July 7
APPLICATION OF RESIDUAL CURRENT CIRCUIT BREAKER WITH 30mA
Fronius International GmbH
hereby confirms that when installing
Fronius Primo 3.0-1 to 8.2-1
Fronius Symo 3.0-3 to 8.2-3
a residual current circuit breakers can be used with a nominal fault current = 30mA, taking into account the
following points:
th
, 2015
Only short-time delayed residual current circuit breakers may be used.
At Fronius Symo inverters the "I∆F Compensation Mode" should be activated in the service menu.
The module field capacitance to ground must be <1µF. (For standard modules, this value should not be a
problem. In case of special constructions - e.g. foil modules on a tin roof - this must be checked in more
detail.)
Residual current circuit breaker types recommended:
Single-phase:
Manufacturer / Model Type
Eaton FRBDM-C25/1N/003-G/A
Eaton FRBDM-D25/1N/003-G/A
Three-phase:
A
A
Manufacturer / Model Type
Hager 63/4/003 A/HI
A+Hi
02/2011 1/2
Otherwise transformerless Fronius inverters shall be combined with residual current circuit breaker, taking into
account the installation instructions. This means, if an earth leakage circuit breaker is used, the nominal residual
current must be ≥ 100mA.
Fronius International GmbH
Solar Energy Division
Froniusplatz 1
A-4600 Wels
DI Thomas Mühlberger
Head of Solution Management
02/2011
2/2
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