39/78 SUREWAVE SFC USER MANUAL
8.3.2 Output circuit protection
The SureWave SFC models < 1 MVA (single enclosure) relies upon downstream protection for cur-
rent overload and short circuit protection when high fault capacities are present on both ends of
the SFC. Downstream protection should be provided by a circuit breaker between the incoming
supply and the SFC as per product specifications, please refer to 2UCD420000E002_a SureWave
SFC Technical Data Sheet.
Inverter modules (PEBBs) do not draw large inrush currents, nor do they consume current be-
yond about 250%. Therefore, downstream protection can be set quite closely. Fast, close protec-
tion should be applied. “Fast” protection refers to clearing times (always without delay / as fast
as possible - for MCCBs typically 8 - 40ms). “Close” means setting the detection current to levels
not much larger than the capability of the rectifier – typically 300%.
