Appendix C: Connecting the AC and DCStrings
to the DC Safety Unit
Some inverter models are supplied with an integrated DC Safety Unit. This appendix
describes how to connect the AC grid and DC strings to the DC Safety Unit.
The DC Safety Unit includes:
Mechanical DCswitch (2-pole disconnection)
DCsurge protection (SPD, Type II)
DCfuses (plus & minus; optional)
This appendix describes connections to DC Safety Unit with or without fuses. The
following figure illustrates the DC Safety Unit supplied with fuses.
Figure 31: Inside the DC Safety Unit with fuses
Appendix C: Connecting the AC and DCStrings to the DC Safety Unit 85
Three Phase System Installation Guide MAN-01-00057-4.1