Specification
QO
®
and QOB Miniature Circuit Breakers
Trip Curves
35
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)
60 A
50 A
40 A
MAXIMUM CLEARING TIME
(AT 50 Hz) (AT 60 Hz)
50 4060
MAXIMUM SINGLE-POLE TRIP TIMES
AT 25°C BASED ON NEMA AB-4 1991
QO
®
FAMILY MOLDED CASE CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 910-5
CIRCUIT BREAKER INFORMATION
Circuit Breaker Continuous Maximum Number
Prex Ampere Rating AC Voltage of Poles
QO-EPD, QO-GFI 40–60 a 120/240 2
a 60 A suitable only for feeding 240 Vac, 2 wire loads on 120/240 Vac, 1
φ
3W systems.
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. 0910TC0105
November 2001
Drawing No. B48095-910-05
(Replaces 0910TC8705)
TM