SMA America, LLC
Electrical Connection
Installation Guide
SB8-10TL-IUS103811
33
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. See the technical data for the maximal permissible rating
Page 60).
DANGER
Risk of fire due to improper wiring.
Death or serious burn injuries will result.
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.
• Do not connect more than 1 inverter to each line circuit breaker.
• When selecting the circuit breaker comply with the maximum permissible fuse
protection of the inverter.
DANGER
Risk of fire due to overcurrent.
Death or serious burn injuries will result.
When a 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.
• Do not connect loads between the Sunny Boy and the line circuit breaker without
protection.
• Always install separate fuses for loads.
NOTICE
Damage to the Sunny Boy by using screw type fuse elements as a load disconnection unit.
A screw type fuse element is not a load disconnection device, and thus must not be used
as a load disconnection unit. A screw type fuse element is only used as cable protection.
When disconnecting under load using a screw type fuse element, the Sunny Boy can be
damaged.
• Only use a load disconnecting switch or a line circuit breaker as a load
disconnecting unit.
