Specification
QO
®
and QOB Miniature Circuit Breakers
Trip Curves
25
07/2008
© 1998–2008 Schneider Electric
All Rights Reserved
1.5
700
150
200
300
400
600
800
900
2000
3000
4000
5000
7000
8000
9000
10000
.5
.6
.7
.8
.9
1
2
3
4
5
6
7
8
9
10
15
20
30
40
50
60
70
80
90
100
6000
1500
1000
500
.005
.006
.007
.008
.009
.01
.015
.02
.03
.04
.05
.06
.07
.08
.09
.1
.15
.2
.3
.4
.5
.6
.7
.8
.9
1
1.5
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
15
200
300
400
500
600
700
800
900
1000
1500
2000
3000
4000
6000
7000
8000
9000
5000
10000
1
.5
.6
.7
.8
.9
1.5
2
3
4
5
6
7
8
9
10
15
20
30
40
50
60
70
80
90
100
MULTIPLES OF RATED CURRENT
TIME IN SECONDS
.005
.006
.007
.008
.009
.01
.015
.02
.03
.04
.05
.06
.07
.08
.09
.1
.15
.2
.3
.4
.5
.6
.7
.8
.9
1
1.5
2
3
4
5
6
7
8
9
10
15
20
30
40
50
60
70
80
90
100
150
200
300
400
500
600
700
800
900
1000
1500
2000
3000
4000
5000
6000
7000
8000
9000
10000
TIME IN SECONDS
1
/2 CYCLE
(60 Hz)
1
/2 CYCLE
(50 Hz)
150
200
300
400
500
600
700
800
900
1000
1500
2000
3000
4000
5000
6000
7000
8000
9000
10000
150
MULTIPLES OF RATED CURRENT
1 CYCLE
(60 Hz)
1 CYCLE
(50 Hz)
MAXIMUM INDIVIDUAL POLE TRIP TIMES
AT 25°C BASED ON NEMA AB-4, 1991
60 A
70 A
50 A
45 A
MAXIMUM CLEARING TIME
(AT 50 Hz) (AT 60 Hz)
70
60
50
45
QO
®
MOLDED CASE CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 730-6
CIRCUIT BREAKER INFORMATION
Circuit Breaker Continuous Maximum Number
Prex Ampere Rating AC Voltage of Poles
QO-HID 45–50 120/240 1, 2
QOU 45–50 240 3
QO-PL 45–60 120/240 2
QO, QOU 45–70 120/240 1, 2
304207–54OQ
202105NWS-OQ
QO-SWN 50 120/240 3
QOM 50–60 120/240 2
QOM-VH 50–60 120/240 2
This curve is to be used for application and coordination purposes only. The
EZ-AMP overlay feature at the bottom of the page should be used during
coordination studies.
All time/current characteristic curve data is based on 40°C ambient cold start.
Terminations are made with conductors of appropriate length and ratings.
®
© 2001 Schneider Electric all rights reserved
Curve No. 0730TC0106
January 2001
Drawing No. B48095-730-06
(Replaces 730-6, dated May, 1987)
TM