PV Powered 3000 Installation Manual download pdf (Page 23)

SMA Solar Technology AG Electrical Connection

Installation Manual SB25_30-IA-IEN115050 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63).

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.

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PV Powered 3000 Installation Manual Page 23