ABB PR512 Manual page 30

TIME-CURRENT CURVES
Very inverse time-delay curve (VI)
t [s]
100
10
1.55
1
0.1
0.05
0.01
1.3
1
0.9
28
2.5
t >
2 3 4 6
5
I>> / I>
20
I >
I>>
K = 1.6
K = 0.1
8 10 20
7
9
I/I>
Very Inverse
Time Curve (IEC 255-3)
t >>
2 3 4 6
5
8 9
7
I [kA]