APC 9000 Mains 2 line protection, Rated inverter output kVA Maximum permissible current

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

t(s)
104
103
102
101
1
10-1
10-2
10-3
10-4	104	105	I(A)
103

Time-current curve 1600 A fuse

34006451EN/AC - Page 31