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Page
41
of
76 MICRO-0.25/0.3-I-OUTD-US-208/240 BCG.00612_AB
Part
3 Mounting and Wiring
3.3.2
DIFFERENTIAL PROTECTION DOWNSTREAM OF THE INVERTER
Aurora Power-One inverters with a high frequency transformer are equipped with an isolation
transformer for each of the DC/DC converters which operate at high frequency (switch-over
frequency of the converter). This transformer allows for high frequency galvanic isolation between
the DC and AC side of the system. In addition to this the inverters include protection mechanisms so
that they cannot input ground fault currents.
Power-One recommends the use of a switch with type A or AC differential
magnetothermal protection with IΔn=30mA sensitivity.
3.3.3 C
HOOSING THE INTERFACE PROTECTION SYSTEM
AND DEVICE DOWNSTREAM OF THE INVERTER
The inverter does not include any electromechanical devices (relays, contactors, etc.) for automatic
disconnection from the power grid. The system must therefore be provided with external
protection for the physical disconnection of the MICRO inverters from the grid, in compliance with
the applicable regulations and with the requirements of the installation country’s power
distributor.
Such protection is typically composed of an interface protection system that analyzes and controls
the grid parameters and, if necessary, sends commands to the interface device, in charge of
physically disconnecting the PV installation MICRO inverters line.
CAUTION: To reduce the risk of fire, connect only to a circuit provided with
20A maximum branch circuit overcurrent protection in accordance with the
National Electric Code (ANSI/NFPA 70)