Fujitsu ETERNUS AF250 - Figure 8 Breaking Characteristics of Distribution Board Circuit Protectors

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Breaking Characteristics
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 8.
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
Figure 8 Breaking Characteristics of Distribution Board Circuit Protectors
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
1
0
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)
D
~
C
~
B
~
Minutes
Seconds
1. ETERNUS AF Installation
Outlet/Socket Specifications
24
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
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