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Compact® NSF and NSJ 150 to 600 A Circuit Breakers
Section 13—Supplementary Technical Information
© 1995–2003 Schneider Electric All Rights Reserved
61
TRIP UNITS FOR COMPACT
®
NSJ400–NSJ600 CIRCUIT BREAKERS
STR53UP
10 000
5 000
2 000
1 000
500
200
100
50
20
10
5
2
1
.5
.2
.1
.05
.02
.01
.005
.002
.001
.5 .7 1 2 3 4 5 7 10 20 30 50 70100 200
3
0
I / Ir
Tsd = 0–0.3 s
Reflex Tripping:
t < 10 ms
Isd = 1.5
I
2
t = OFF
Isd = 1.5
I
2
t = ON
Ir = 0.4–1 x In
tr = 1–8 s (6 Ir)
For Hot Start (0.9 x Ir) Divide
Max. Time by 2, Min. Time by 4
Isd = 1.5–7 x Ir
Ii = 1.5–9 x in
t(s)
STR23SP
10 000
5 000
2 000
1 000
500
200
100
50
20
10
5
2
1
.5
.2
.1
.05
.02
.01
.005
.002
.001
.5 .7 1 2 3 4 5 7 10 20 30 50 70100 200
300
t(s)
I / Ir
I = 11 x In
Ir = 0.4–1 x In
Im = 2
–9 x Ir
Reflex Tripping:
t < 10 ms
STR53UP Ground-fault Protection
10 000
5 000
2 000
1 000
500
200
100
50
20
10
5
2
1
.5
.2
.1
.05
.02
.01
.005
.002
.001
.05.07 .1 .2 .3 .4.5 .7 1 2 3 5 7 10 20 3
0
t(s)
I / In
0.2
0.4
0.3
0.1
I
2
t ON
I
2
t OFF
Ig = 0.2
–
1 x In
Reflex Tripping: See Page 62
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