Thytronic NA011 - Residual Overcurrent 50 N;51 N - very Inverse Time Curve (IEC 60255-3;BS142 Type B)

APPENDIX
76
NA011 - Manual - 05 - 2022
 Residual overcurrent 50N/51N - Very inverse time curve (IEC 60255-3/BS142 type B)
F_51N-IECB-Char.ai
1.1
2 3 4 5 6 7 8 9 10 20
I
E
/I
E
>inv
I
E
/I
E
>>inv
0.01
0.1
1
10
100
1000
10000
t [s]
10 s
60 s
t
E>inv
t
E>>inv
5 s
1 s
0.5 s
0.2 s
0.02 s
0.1 s
t =
t
E
>
inv
·
[(I
E
/I
E
>
inv
) -1]
13.5
t =
t
E
>>
inv
·
[(I
E
/I
E
>>
inv
) -1]
13.5
Note: match of operating and setting time takes place when I
E
/I
E
>
inv
or I
E
/I
E
>>
inv
= 14.5