ALLTRONIC SEMIS T33 Manuel D'installation Et D'utilisation page 134

E P
XTERNAL ROTECTIVE
MAGNETOTHERMAL
If the protective device upstream from the UPS interrupts the neutral wire, it must also interrupt all the phase
wires at the same time (four-pole switch).
Output protections (recommended values for discrimination)
DIFFERENTIAL
THE UPS IUT NEUTRAL IS CONNECTED TO THE UPS OUTPUT NEUTRAL
THE DISTRIBUTION SYSTEM THAT POWERS THE UPS IS NOT MODIFIED BY THE UPS
The neutral condition is only modified if an isolation transformer is present or when the UPS works with a
neutral isolated upstream.
Make sure that the equipment is connected correctly to the iut neutral because as damage may be
caused to the UPS.
D
EVICES
Automatic external protective devices