SMA Solar Technology AG 6 Electrical Connection
Operating Manual MC-BOX-6_12-BE-en-20 25
6.3.1 Connecting the Generator
You can connect a three-phase generator to the Multicluster Box, e.g. a diesel generator or another
grid-forming power generator. However, you also have the option of connecting it to the utility grid.
The line conductors L1, L2 and L3 are routed via a fuse switch-disconnector in the Multicluster Box.
Fuse links with a nominal current of 80 A (Multicluster Box 6.3) or 160 A (Multicluster Box 12.3) are
installed ex works.
Cable dimensioning:
If the generator does not have an output fuse, the connection cables to the Multicluster Box must be
short-circuit and ground-fault protected. As an alternative, you can install an additional fuse box close
to the generator, especially in case of longer cable routes.
Cable requirement:
☐ Conductor material: copper
Procedure:
1. Prepare the connection cables (see Section6.2 "Preparing the Cables", page24).
2. Connect the grounding conductor and N to the terminal X1 Generator as labeled.
3. Connect L1, L2 and L3 to the fuse switch-disconnector F1 Generator as labeled.
4. According to the type of cable routing and the installation conditions, determine the required
fuse link for the fuse switch-disconnector and insert it in the fuse holder.
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