APC galaxy 9000 User Manual
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
– 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.
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)