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NVA100X-D - Manual - 02 - 2016
APPENDIX
46M - First element - Standard inverse time curve (type A)
—
F_46M-IECA-Char.ai
1.1
2
3
4
5
6
7
8 9 10
20
I
2
/
I
2
>inv
0.01
0.1
1
10
100
1000
10000
t
[s]
10 s
60 s
t
2
>
inv
5 s
1 s
0.5 s
0.2 s
0.1 s
0.02 s
t
=
t
2
>
inv
·
[(
I
2
/
I
2
>
inv
)
0.02
-1]
0.14
Note: match of operating and setting time takes place when I
2
/I
2
>
inv
= 700