Fujitsu ETERNUS AB Series - Figure 20 Breaking Characteristics of Distribution Board Circuit Protectors

1. ETERNUS AB/HB Installation
Outlet/Socket Specifications
Site Planning Guide
45
■ Breaking Characteristics
Figure 20 Breaking Characteristics of Distribution Board Circuit Protectors
The breaking characteristics (*1) of the distribution board circuit protectors must be the long-time
delay type and must be equivalent to or slower than the D (IEC/EN60898-1) shown in Figure 20
.
If the distribution board's circuit protectors have a breaking characteristic that is faster than D, the
breaker may trip when a power supply unit in the storage system fails. When the breaker trips, a
shutoff occurs on multiple power supply units connected to the same connection line as the failed
power supply unit.
*1: Relationship between the size of excess current and operation time
0.01
0.02
0.04
0.06
0.1
0.2
0.4
0.6
1
2
4
6
10
20
40
1
2
4
6
10
20
40
60
120
180
1 1.5 2 3 4 5 6 7 8 10 15 20 30 40 50 80 100
Current (ratio for the current rating)
Operation time
DC
B
Minutes Seconds