Protecting The Solar Array And Dc Input Cables From Short-Circuits; Protecting The Inverter And Ac Output Cable From Thermal Overload; The Use Of External Rcd - ABB PVS300 Product Manual

38 Planning the installation

Protecting the solar array and DC input cables from short-circuits

The inverter DC string fuses and short-circuit diode protect the inverter DC circuit, the
DC input cables and solar modules from short-circuit situations provided that the DC
cables and solar array are dimensioned according to inverter nominal DC voltage,
current and string fuse ratings.

Protecting the inverter and AC output cable from thermal overload

The inverter protects itself against thermal overload provided that the cable is
dimensioned according to the nominal current of the inverter. A circuit breaker should
be installed on the AC distribution board side to protect AC cabling and electrical grid
interface devices.

The use of external RCD

This inverter can produce current with a DC component. Where an external residual
current-operated protective (RCD) or monitoring (RCM) device is used for protection
against direct or indirect contact, only type B devices are allowed on the output (AC)
side of this product.
In normal operation, PVS300 inverters generate up to 60 mA leakage current peaks.
Therefore, if an external RCD is used, it must have a nominal rating of at least 60 mA
per inverter which is connected to it.