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10/172 Tripping characteristics
Circuit-breakers
Circuit-breakers, switch-disconnectors
up to 1600 A
Systems, cable, selectivity and generator protection with NZM4
Tripping time [s]
2.5h 8000
6000
4000
2000
1000
800
(10 min) 600
400
200
100
80
(1 min) 60
40
20
10
6 8
4
2
0.8 1
0.6
0.4
0.2
0.1
0.08
0.06
0.04
0.02
0.01
0.008
0.006
0.004
0.002
t sd [ms] = 20............1000
I sd = 2 3 4 5 6 7 8 910
I i =
t r [s]
20
17
14 10
8
6
4
2
x I r
2 3 4 5 6 7 8 10 12 x I n
NZM4-VE630...1600
Characteristics for I r = 1,0 x I n
I 2 t = constant
Motor protection with NZM4
Tripping time [s]
2.5h 8000
6000
4000
2000
1000
800
(10 min) 600
400
200
100
80
(1 min) 60
40
20
10
6 8
4
2
0.8 1
0.6
0.4
0.2
0.1
0.08
0.06
0.04
0.02
0.01
0.008
0.006
0.004
0.002
I i =
t r [s]
20
17
14
10 8 6
4
2
2 3 4 5 6 8 10 12 14 x I r
Moeller HPL0211-2004/2005
NZM4-ME550...1400
Characteristics for I r = 1,0 x I n
0.001
1
2 3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100
0.001
1
2 3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100
x I r
x I r
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