10
11
Table 2
Overcurrent tripping characteristics, type Release type
Test current
Non-tripping or tripping time
С; D
thermal release
1,13 I
n
t
≤
1 hour (at I
n
≤
63А) – without tripping
t
≤
2 hours (at I
n
> 63А) – without tripping
1,45 I
n
t < 1 hour (at I
n
≤
63А) – tripping
t < 2 hours (at I
n
> 63А) – tripping
2,55 I
n
1s < t < 60 s (at I
n
≤
32А) – tripping
1s < t < 120 s (at I
n
> 32А) – tripping
С
electromagnetic
release
5 I
n
t
≤
0,1 s – without tripping
10 I
n
t < 0,1 s – tripping
D
electromagnetic
release
10 I
n
t
≤
0,1 s – without tripping
15 I
n
t < 0,1 s – tripping
0.005
0.1
0.5
1
10
5
50
100
500
1000
10000
5000
1
10
20 30
0.01
2
3
8
40 60 80
1,13
1,45
120
60
30
10
5
2
1
I/In
2.55
5 60
40
Environment tempe30°С
Environment tempe30°С
Характеристика
C
Fig. 1 C characteristics
Environment tempe30°С
Environment tempe30°С
Характеристика
D
60
40
0.005
0.1
0.5
1
10
5
50
100
500
1000
10000
5000
1
10
20 30
0.01
2
3
8
40 60 80
1,13
1,45
120
60
30
10
5
2
1
I/In
2.55
5
14
Fig. 2 D characteristics
In Fig. 1, 2: dashed line – upper limit of time-current characteristic for
automated circuit breakers with rated current I
n
< 32 А
