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Chapter 2 ETERNUS DX Disk Storage System Installation
2.7 Circuit Protectors
ETERNUS DX80 S2/DX90 S2 Disk storage system User’s Guide -Site Planning-
Copyright 2013 FUJITSU LIMITED P3AM-4822-12ENZ0
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■ Breaking characteristics
The breaking characteristics (*1) of distribution board circuit protectors must be equivalent to or slower than
D (IEC898), which is shown in Figure 2.8
.
*1: Relationship between the size of excess current and operation time
Figure 2.8 Breaking characteristics of distribution board circuit protectors
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
Operation time
Current (ratio for the current rating)
Seconds
Minutes
DC
B
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