Sma SB 700 Manuel d'utilisateur télécharger pdf (Page 47)

SMA Technologie AG Rating for a line circuit breaker

Installation Guide SB700-11:SA2006 Page 47

Summary:

The selected line circuit breaker can be used in our example case since the maximum

current-carrying capacity for fault-free operation is higher than the maximum output

current of the inverter used. It will trip under rated operating conditions!

If the calculated current-carrying capacity of the circuit breaker had been lower than

the maximum output current from the inverter, the following solution might have been

used:

By spacing the circuit breakers at an interval of 8 mm, the reduction factor would be

0.98 instead of 0.77. As a result, the maximum current-carrying capacity would

increase to 9.4 A.

As well as the thermal rating of the circuit breakers and all other factors as specified

in section "Rating for a line circuit breaker in a photovoltaic electrical power unit

operated in parallel with the low-voltage grid" (page 16), of course the applicable

DIN VDE standards

also need to be taken into account. The main ones that apply

here are:

• DIN VDE 0100; part 410

• DIN VDE 0100; part 430

• DIN VDE 0298; part 4

In special applications the relevant standards must be followed.

1. The standards mentioned above are to be only used as a guideline for your

installation. They apply for installations in Germany. Please note that other

standards will apply for different countries throughout the world.

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Sma SB 700 Manuel d'utilisateur Page 47