3RU11, 3RB10, and 3RB12 overload relays
SIRIUS System Manual
4-18
GWA 4NEB 430 0999-02b
Figure 4-8: Time-current characteristic, chart for the 3RU11
3RB10
Tripping characteristic
The time-current characteristics show the behavior at starting, with a three-
pole load
¿
from a cold state
À
from a warm state
Á
in the event of phase loss or current imbalance (the phase loss protection
function triggers the overload relay after 3 seconds)
Figure 4-9: Time-current characteristics for class 10 and class 20, chart for the 3RB10
10
100
1000
10 000
5000
2000
500
200
50
20
5
2
1
1
2
5
10
40
60
100
0,6
0,8 1
2
3
4
6
8
10
20
30
40
60
80 x
I
n
A
min
s
15
three-pole
load
two-pole
load
Current
Tripping time
CLASS 10
CLASS 20
10
6
4
6
4
2
1
2
4
10x
I
e
sm
in
NSB00294
0,6
1
6
8
10
50
1
2
20
40
1
2
3
Tri
p
p
in
g
t
im
e
Tripping current (mean values)
10
6
4
6
4
2
1
2
4
10x
I
e
sm
in
NSB00293
0,6
1
6
8
10
50
1
2
20
40
1
2
3
Tri
p
p
in
g
t
im
e
Tripping current (mean values)
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