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17/156 Circuit-breakers, switch-disconnectors
Construction size 3, 4: tripping characteristics
2010 CA08103002Z-EN
www.eaton.comConstruction size 3, 4: trippingcharacteristics
Systems, cable, selectivity and generator protection with NZM3
Motor protection with NZM3
Notes
With the free CurveSelect software you can quickly and easily create detailed representations of individual settings:
www.moeller.net,Products & Solutions > Power Distribution > Switching and Protecting Power Distribution > CurveSelect: Characteristics program
Tripping time [s]
Characteristics for I
r
= 1,0 x I
n
without “I
2
t = constant” function
250 A, 400 A
250 A, 400 A
1000
750
500
300
200
100
60
20
2
3 4 5 6 7
7
8 9 10
6
0
5 4 3
2
7 8 9 11x I
n
I
i
=
I
sd
=
65 43.5
2.5 3
2
7 8
630 A
I
i
=
x I
n
x I
r
t
sd
[ms]
6
2
3 3.5
2.5
1.5
4 5
630 A
I
sd
=
x I
r
20
t
r
[s]
17
14
10
6
8
4
2
2
3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100
x I
r
1
0.001
0.002
0.004
0.006
0.008
0.01
0.02
0.04
0.06
0.08
0.1
0.2
0.4
0.6
0.8
1
2
4
6
8
10
20
40
60
600
80
100
6000
2.5 h
200
400
800
1000
2000
4000
8000
(10 min)
(1 min)
NZM3(-4)-VE...
Characteristics for I
r
= 1,0 x I
n
I
2
t = constant
Tripping time [s]
250 A, 400 A
250 A, 400 A
2
3 4 5 6 8 910 x I
r
2 1.5
2.5 3.5 3 4 5 6 7
7
I
sd
=
I
sd
=
x I
r
20
t
r
[s]
17
14
10
6
8
4
2
630 A
2
3 4 5 6 7 8 9 11
I
i
=
x I
n
2 2.5 3.5 3 4 5 6 8
I
i
=
x I
n
7
630 A
1
2
3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100
x I
r
tsd [ms] = 20........1000
0.001
0.002
0.004
0.006
0.008
0.01
0.02
0.04
0.06
0.08
0.1
0.2
0.4
0.6
0.8
1
2
4
6
8
10
20
40
60
600
80
100
6000
2.5 h
200
400
800
1000
2000
4000
8000
(10 min)
(1 min)
NZM3(-4)-VE...
2
3 4 5 6 8 10 12 14
I
i
=
x I
r
20
tr [s]
17
14
10
6
8
4
2
NZM3-ME...
2
3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100
x I
r
1
0.001
0.002
0.004
0.006
0.008
0.01
0.02
0.04
0.06
0.08
0.1
0.2
0.4
0.6
0.8
1
2
4
6
8
10
20
40
60
600
80
100
6000
2.5 h
200
400
800
1000
2000
4000
8000
(10 min)
(1 min)
Characteristics for I
r
= 1,0 x I
n
Tripping time [s]
NZM3, NZM4