SMA SB 3300-11 Installation - Manual (Page 24)

Electrical Connection SMA Solar Technology AG
24 SB33-38-11-IA-en-62 Installation Manual
Load Disconnection Unit
You must install a separate miniature circuit-breaker for each inverter in order to ensure that the
inverter can be securely disconnected under load. The maximum permissible fuse protection can be
found in section 11 "Technical Data" (page 64).
Detailed information and examples for the rating of a miniature circuit-breaker can be found in the
Technical Information "Miniature Circuit-Breaker" in the SMA Solar Technology AG download area
at www.SMA.de/en.
DANGER!
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. It can result
in a cable fire or destruction of the inverter.
• Never connect several inverters to a single miniature circuit-breaker.
• Observe the maximum permissible fuse protection of the inverter when selecting the
miniature circuit-breaker.
DANGER!
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 power distribution grid can accumulate
to overcurrent which is not detected by the miniature circuit-breaker.
• Never connect loads between the
inverter and the miniature circuit-breaker
without fuse protection.
• Always protect loads separately.
NOTICE!
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.
When disconnecting under load using a screw type fuse, the inverter can be damaged.
• Use only a switch-disconnector or a miniature circuit-breaker as a load disconnection
unit.