Technical data

11/98
©1995 Square D—All Rights Reserved
38
Trip Curves
Overcurrent Protection STR 38S Control Unit
06313079
(*) Instantaneous
Rating In (A) 630 800/1000 1200/1600 2000 2500 3000/3200 4000/5000/6300
Fixed Threshold I = In x … 28 28 24 20 14 12 10
Time in Seconds
10 20 30 4056789 5060
70 80
90
432
.5 .6 .7 .8.9
1 1.5
100
20 30 40 50 60
345678910 20
30 40 6050
2
x Ir x In
1.2
1.2
.01
.1
.02
.03
.04
.05
.06
.07
.08
.09
1
.2
.3
.4
.5
.6
.7
.8
.9
10
2
3
4
5
6
7
8
9
30
40
20
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
2000
3000
4000
5000
6000
7000
8000
9000
1056789432
.5 .6 .7 .8.9
1 1.5
.01
.1
.02
.03
.04
.05
.06
.07
.08
.09
1
.2
.3
.4
.5
.6
.7
.8
.9
10
2
3
4
5
6
7
8
9
30
40
20
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
345678910 20
30 40
80 90
100
70
6050
2
70 80
90
100
80 90
100
70
0
0.3
0.2
0.1
0.4
Short-time Pickup
Im = 1.5–10 x (Ir)
0.3
0.2
0.1
I t OFF
I t ON
Inst (*)
Current Setting:
STR 38S = 0.4–1 x Sensor Rating
STR 38SP = 0.8–1 x Plug Rating
2
2
2