SMA Solar Technology AG 6 Electrical Connection
Installation Manual SB30-50TL-21-IA-en-21 35
Danger to life due to fire
When more than 1 inverter is connected in parallel to the same miniature circuit-breaker, the
protective function of the miniature circuit-breaker is no longer guaranteed. This could result in a
cable fire or destruction of the inverter.
• Never connect several inverters to the same miniature circuit-breaker.
• Observe the maximum permissible fuse protection of the inverter when selecting the miniature
circuit-breaker.
Danger to life due to fire
When a generator (inverter) and a load are connected to the same miniature circuit-breaker, the
protective function of the miniature circuit-breaker is no longer guaranteed. The currents from the
inverter and the electricity grid can accumulate to form overcurrents which are not detected by the
miniature circuit-breaker.
• Never connect loads between the inverter and
the miniature circuit-breaker without fuse
protection.
• Always fuse loads separately.
Damage to the inverter by using screw-type fuses as a load disconnection unit
A screw-type fuse, e.g. DIAZED fuse or NEOZED fuse, is not a switch-disconnector and thus may not
be used as a load disconnection unit. A screw-type fuse only acts as cable protection.
If the inverter is disconnected under load using a screw-type fuse, the inverter may be damaged.
• Use only a switch-disconnector or a miniature circuit-breaker as a load disconnection unit.
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