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34006451EN/AC - Page 31
3. Appendix (to be carried out by qualified personnel only)
3.1 Mains 2 line protection
The rating of the mains 2 line upstream protection circuit-breaker must be chosen:
– to protect the static switch thyristors with respect to maximum permissible currents. Refer to the table opposite for a 400 V
mains 2 voltage;
– to ensure discrimination with respect to the UPS output fuses (refer to fuse time-current curves below) and to the
downstream protective devices.
rated inverter output (kVA) maximum permissible current
800 19 In for 20 ms
900 19 In for 20 ms
Time-current curve 1600 A fuse
10
-4
10
-3
10
-2
10
-1
10
1
1
10
2
10
3
10
4
t(s)
10
3
10
4
10
5
I(A)