SMA Solar Technology AG Electrical Connection
Installation Guide SB30TL_40TL_50TL-IA-IEN120231 27
Cable Requirements
Load disconnection unit
You must install a separate line circuit breaker for each inverter in order to ensure that the inverter
can be securely disconnected under load. The maximum permissible rating is located in section
13”Technical data” (page88).
Detailed information and examples for the design of a line circuit breaker can be found in the
Technical Information "Line Circuit Breaker" in the SMA Solar Technology AG download area at
www.SMA.de/en.
Object Description Value
A External diameter 12 mm ... 25 mm
B Cross-section of insulated conductor Max. 10 mm²
C Strip insulation Approx. 12 mm
DANGER!
Danger to life due to fire.
When more than one inverter is connected to the same line circuit breaker, the protective
function of the line circuit breaker is no longer guaranteed. It can result in a cable fire or
the destruction of the inverter.
• Never connect several inverters to the same line circuit breaker.
• Observe the maximum permissible fuse protection of the inverter when selecting the
line circuit breaker.
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