Thytronic Pro-N NVA100X-D

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