Gtec SATURN Serie Manuel D'installation Et D'utilisation page 78

Separate bypass on separate lines:
if the separate bypass option is present, all protective devices will have to be placed both on the main supply line and on the line
dedicated to the bypass.
Note: the input line and bypass line neutral are shared inside the device; therefore, they will have to be connected to the same
potential. If the two power supplies are different, you must use an isolation transformer on one of the inputs.
with separate bypass input connected on an independent power line
UPS without neutral connectivity variation and
UPS with separate bypass input connected
on an independent power line and with galvanic input insulation
UPS with separate bypass input connected
on an independent power line and with galvanic output insulation
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