Electrical Connection
SMA Solar Technology AG
20
SB11_17-IEN084820
Installation Guide
Load Disconnection Unit
The maximal permissible rating is located in the technical data (page 39).
Load Disconnection Unit
Use only line circuit breakers as load disconnection units!
A screw type fuse, e.g., D system (Diazed) or D0 system (Neozed) is not a load
disconnection unit and therefore must not be used as one.
Upon disconnection under load, the screw type fuse element may be destroyed, or its
functionality may be inhibited by contact burning. It only acts as cable protection.
DANGER!
Danger to life due to fire!
When a generator (Sunny Boy) and a
consumer are connected to the same line
circuit breaker, the protective function of the
line circuit breaker is no longer guaranteed.
The current from the Sunny Boy and the grid
can add up to overcurrent which is not
detected by the line circuit breaker.
• Never connect loads unsecured between the Sunny Boy and the line circuit breaker.
• Always install separate fuses for loads.
Rating for a Line Circuit Breaker
Detailed information and examples concerning the rating of a line circuit breaker can be
found in the Technical Information "line circuit breaker" in the download area of SMA Solar
Technology at www.SMA.de.
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