SMA SMC 4600A Installation - Manual (Page 23)

SMA Solar Technology AG Electrical Connection
Installation Manual SMC46-60A11-IA-en-81 23
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 70).
Detailed information and examples on the design of miniature circuit-breakers are available in the
Technical Information "Miniature Circuit-Breaker" to be found in the download area of
SMA Solar Technology AG at www.SMA-Solar.com.
DANGER!
Danger to life due to fire
When more than one 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!
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.
NOTICE!
Damage to the inverter by use of screw-type fuses as switch-disconnectors
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.