SMA STP 10000TL-10 Installation - Manual (Page 31)

SMA Solar Technology AG 6 Electrical Connection
Installation Manual STP10-17TL-IA-en-32 31
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. You should use a three-pole miniature
circuit-breaker. If you are using a single-pole miniature circuit-breaker, a residual voltage from the
inverter may be present on the relevant cable after disconnection (maximum permissible fuse
protection (see Section 14 "Technical Data", page 92)).
Danger to life due to fire
When more than one inverter is connected in parallel to the same miniature circuit-breaker, the
protective function of the miniature circuit-breaker is no longer guaranteed. This could 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 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 electricity grid can accumulate to form overcurrents which are not detected by the
miniature circuit-breaker.
• Never connect loads between the inverter and the miniature circuit-breaker without fuse
protection.
• Always protect loads separately.
Damage to the inverter by use of screw-type fuses as switch-disconnectors
A screw-type fuse, 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 only acts as cable protection.
If the inverter is disconnected under load using a screw-type fuse, the inverter may be damaged.
• Use only a switch-disconnector or a miniature circuit-breaker as a load disconnection unit.