ABB PR512 - Page 31

29
6
10
100
0.1
0.05
0.01
0.9
1.3
1
10
2
2
20
3
3
4
4
5
5
6
6
I/I> I [kA]
t [s]
2.5
I>> / I>
20
7
7
8
8
9
9
t >>
K = 1.6
I
>
I>>
Extremely Inverse
Time Curve (IEC 255-3)
1.55
1
K = 0.1
t >
Extremely inverse time-delay curve (EI)