External Protection Devices - ALLTRONIC SEMIS T33 30 Serie Manual De Instalacion Y Uso

E
XTERNAL PROTECTION DEVICES
MAGNETOTHERMAL
If the protection device upstream of the UPS interrupts the neutral conductor, it must also interrupt all the phase
conductors at the same time (quadripolar switch).
DIFFERENTIAL
THE DISTRIBUTION SYSTEM THAT POWERS THE UPS IS NOT MODIFIED BY THE UPS
WARNING: make sure that the equipment is connected correctly to the input neutral, or else
damages to the UPS may be caused.
The neutral regime is modified only in presence of an isolation transformer or when the UPS operates with a neutral
isolated upstream.
Automatic external protections
Output protections (recommended selectivity values)
THE INPUT NEUTRAL IS CONNECTED TO THE OUTPUT NEUTRAL