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Chapter 2 ETERNUS DX Disk Storage System Installation
2.6 Circuit Protectors
ETERNUS DX60 S2 Disk storage system User’s Guide -Site Planning-
37
Copyright 2012 FUJITSU LIMITED P3AM-5492-04ENZ0
2.6.2 Breaking Characteristics
■ For power distribution unit (2U) connection
The breaking characteristics (*1) of distribution board circuit protectors must be slower than the
values shown in Figure 2.4
or equivalent to D (IEC898).
*1: Relationship between the size of excess current and operation time
Figure 2.4 Power distribution unit (2U) breaking characteristics (graph)
Table 2.10 Power distribution unit (2U) breaking characteristics (Trip time (sec.))
Delay 100% 125% 150% 200% 400% 600% 800% 1000%
63
No Trip 50 to
700
30 to
400
10 to
150
1.5 to
20
0.4 to
10
0.013 to
0.85
0.013 to
0.5
150100 200 300 400 500 600 700 800 900 10000
125
PERCENT OF RATED CURRENT
100
1000
10000
10
1
.1
.01
.001
TIME IN SECONDS
DELAY 63
MAY TRIP