6 Electrical Connection
SMA America, LLC
40
SB3-5TLUS22-IA-en-10
Installation Manual
Switch-disconnector and cable protection:
• In plants with multiple inverters, protect every inverter with a separate miniature circuit-breaker.
Observe the maximum permissible fuse protection (see Section 11 "Technical Data", page 82).
In doing so you avoid residual voltages being present at the respective cables after a
disconnection from the power distribution grid.
• Loads installed between the inverter and the miniature circuit-breaker must be protected
separately.
6.3.2 Connecting the Inverter to the Power Distribution Grid
Requirements:
☐ The country data set and the display language must be correctly set (see Section 7.1 "Making
Settings via the Rotary Switches", page 52).
☐ The connection requirements of the grid operator must be met.
☐ The line voltage must be within the permissible range. The exact operating range of the inverter
is specified in the operating parameters.
1. Switch off all AC and DC circuit-breakers and miniature circuit-breakers and secure against
re-connection.
2. Switch off the main breaker in the fuse box.
3. Ensure that there is no voltage between the fuse output and the grounding busbar.
4. Loosen all 6 screws of the lower enclosure lid using an Allen key (AF 3) and remove the
enclosure lid.
5. Loosen the screw on the display and flip the display
up until it clicks into place. Do not kink the adjacent
cable when doing so.
Damage to the inverter by using screw-type fuses as switch-disconnectors
Screw-type fuses do not have load disconnection properties and may damage the inverter if
disconnected under load.
• Do not use screw-type fuses as switch-disconnectors.
• Use a switch-disconnector or a listed miniature circuit-breaker with load disconnection
properties as switch-disconnector.
