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APPENDIX
325
NVA100X-D - Manual - 02 - 2016
46M - First element - Very inverse time curve (IEC 60255-3/BS142 type B)
—
F_46B-IECB-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
t
>
inv
= 0.02 s
t
>
inv
= 0.1 s
t
=
t
2
>
inv
·
[(
I
2
/
I
2
>
inv
) -1]
13.5
Note: match of operating and setting time takes place when I
2
/I
2
>
inv
= 14.5