SMA SB 2500 Installation - Manual (Page 23)

SMA Solar Technology AG Electrical Connection
Installation Manual SB25-30-IA-en-51 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 62).
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 mains can accumulate to overcurrents that are not
detected by the miniature circuit-breaker.
• Never connect loads between the
inverter and the miniature circuit-
breaker without protection.
• Always protect loads separately.
NOTICE!
Damage to the inverter by using screw type fuse elements as a load
disconnection unit
A screw type fuse element, 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 element serves
as cable protection only.
When disconnecting under load using a screw type fuse element, the inverter can be
damaged.
• Use only a switch-disconnector or a miniature circuit-breaker as a load disconnection
unit.