Molded Case Circuit Breakers
QOM1/QOM2
Class 736
CONTENTS
Description
Page
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Characteristic Tripping Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application Data
Description
Construction Standards
QOM1/QOM2 two pole thermal-magnetic circuit
breakers are available from 70 through 225
amperes. Voltage rating – 120/240 Vac
QOM1/QOM2 circuit breakers are built in
accordance with Underwriters Laboratories
Standard UL 489 and NEMA Standard AB1-1975.
QOM1/QOM2 circuit breakers are UL Listed under
File #E84905 and CSA Certified under File
LR40970-5. 70–100 ampere circuit breakers meet
Federal Specification W-C-375B/GEN Class 12a.
Application
2-Pole QOM125
QOM1/QOM2 circuit breakers may be field or
factory installed as a main breaker in QO circuit
breaker load centers with convertible mains. These
circuit breakers have lug orientation to allow for
straight-in wiring and have horizontal handle
operation to allow for top or bottom feed
applications.
Ratings
QOM1/QOM2 circuit breaker catalog numbers and
application information are shown in the table
below:
2-Pole QOM225
Main
Use with 10,000 AIR 22,000 AIR
Lug Wire
Circuit Convertible
Size h
Main
Main
Breaker Load Center
AWG/kcmil
Circuit
Circuit
Amp
Mains
Al or Cu
Breaker
Breaker
Ratingq
Rating
QOM1 Frame Size
70
80
90
100
110
125
100–125
100–125
100–125
100–125
125
125
QOM70
QOM80
QOM90
QOM100
QOM110
QOM125
QOM70VH
QOM80VH
QOM90VH
QOM100VH
QOM110VH
QOM125VH
#4-#2/0
100
125
150
175
200
225
150–225
150–225
150–225
200–225
200–225
225
QOM2100
QOM2125
QOM2150
QOM2175
QOM2200
QOM2225
QOM2100VH
QOM2125VH
QOM2150VH
QOM2175VH
QOM2200VH
QOM2225VH
#4-300
The use of series connected ratings allows load
centers with a 22,000 ampere interrupting rating
(AIR) main circuit breaker and standard 10,000 AIR
branch breakers to carry UL Listed short-circuit
current ratings of 22,000 rms symmetrical amperes.
Combinations suitable for this purpose are Listed
by Underwriters Laboratories and appear in File
E6294.
Type
Ampere
No. of Ampere
Type
Rating
Poles Rating
QO
1
QOM1-VH
QO
2
and
70-225 QO-GFI 1 & 2
QOM2-VH
Q1
1
Q1
2
15-70
15-100
15-30
15-100
15-150
QOM1/QOM2 circuit breakers have individual
thermal-magnetic trip elements in each pole. The
trip element is calibrated for 40°C ambient
temperature.
Trip Indication
When the circuit breaker is tripped, the handle
assumes a center position between ON and OFF.
The circuit breaker can be reset by pushing the
handle to the extreme OFF position and then to the
ON position.
Accessories
QOM2 circuit breakers can be supplied with factory
shunt trip. For complete information on accessories,
refer to Catalog Class 690 “Accessories for Molded
Case Circuit Breakers” or the latest version of the
Square D Digest.
Series Connected Ratings
Branch
Circuit Breaker
Tripping Mechanism
QOM1/QOM2 circuit breakers have captive plated
box-type lugs. The lugs are suitable for use with
75°C wire.
q Do not exceed the load center mains rating.
Main
Circuit Breaker
QOM1/QOM2 circuit breakers have an over-center,
trip-free toggle mechanism with quick-make, quickbreak action and positive handle indication. An
integral crossbar opens both poles simultaneously.
Terminations
QOM2 Frame Size
QOM225 with Shunt Trip
Operating Mechanism
Series Connected Interrupting Ratings
RMS Symmetrical Amperes
Handle Padlock Attachment
Handle padlock attachments are available to
padlock QOM1/QOM2 circuit breakers in the OFF
position.
Frame Size
Ampere Rating
Attachment
Catalog Number
QOM1
QOM2
70–125
100–225
QOM1PA
QOM2PA
120/240 Vac
Max.
22,000
22,000
22,000
22,000
22,000
2
© 1997 Square D All Rights Reserved
10/97
Dimensions
70–125 Ampere Breakers — QOM1
2.40
3.47
3.00
1.75
88
2.30
76
1.54
61
58
39
44
.31
8
.16R Typ.
4
.39
.31 Typ.
10
8
.34
2.55
9
65
1.87
47
4.95
125
126
.41 Typ.
10
2.96
3.53
5.10
130
75
90
4.20
2.75
107
70
.63 Typ.
16
.31 Typ.
8
.89
.61
23
16
.71
1.99
51
18
2.22
56
3.05
77
.60
15
.39
10
1.06
1.81
27
46
1.70
43
Vents
.25
6
1.24
31
3
10/97
© 1997 Square D All Rights Reserved
Dimensions
100–225 Ampere Breakers — QOM2
.13
.26
3
7
.75
.81
19
21
2.24
57
3.06
.25
78
6
2.12
54
.75
19
.82
1.13
21
29
.18 Typ.
2.85
4
72
.97
.80
25
.19 Dia. Hole
20
2.28
5
58
1.81
46
.84
3.48
1.67
21
88
19
1.68
43
5.28
134
1.74
44
.50
3.62
5.60
13
92
142
.18R
5
1.02
.48
21
26
.21
5
.58
.13
15
.95
24
2.46
62
1.67
42
.76
19
5.07
3
.90
23
129
3.61
92
4
© 1997 Square D All Rights Reserved
10/97
Characteristic Tripping Curves
10000
9000
8000
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-1
7000
6000
5000
CIRCUIT BREAKER INFORMATION
4000
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
70 & 80
120/240
2
3000
1
9
8
7
10000
9000
8000
6
6000
5
5000
4
4000
80
90
100
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
70
1
9
8
7
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-2
7000
3
6
5
CIRCUIT BREAKER INFORMATION
4
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
90 & 100
120/240
2
3000
3
2000
2
2000
2
1500
1
1500
1
1000
900
800
1
9
8
1000
900
800
1
9
8
700
7
700
7
600
6
600
6
500
5
500
4
400
400
MAXIMUM SINGLE POLE TRIP TIME AT 25°C
BASED ON NEMA AB-2, 1980
5
4
MAXIMUM SINGLE POLE TRIP TIME AT 25°C
BASED ON NEMA AB-2, 1980
3
300
200
2
200
2
150
1
150
1
300
100
90
80
70
70
60
60
50
50
40
40
30
30
20
20
15
15
10
9
8
10
9
8
7
7
6
6
TIME IN SECONDS
100
90
80
5
4
3
2
4
3
2
1.5
1
.9
.8
1
.9
.8
.7
.7
.6
.6
.5
.5
.4
.4
.3
.3
.2
.2
80A
.15
3
5
1.5
100A
.15
70A
90A
.1
.09
.08
.1
.09
.08
.07
.07
.06
.06
.05
.05
.04
.04
.03
.03
.02
M
(A
.02
.015
1 CYCLE
(60 Hz)
.015
1 CYCLE
(60 Hz)
.01
.009
.008
1
.01
.009
.008
1
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.7
.6
.5
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.005
.8
.9
1
.005
.7
.006
.6
2 CYCLE
(60 Hz)
.007
.006
.8
.9
1
2 CYCLE
(60 Hz)
.007
.5
TIME IN SECONDS
.5
80
90
100
70
60
50
40
30
MULTIPLES OF RATED CURRENT
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
.5
MULTIPLES OF RATED CURRENT
5
10/97
© 1997 Square D All Rights Reserved
Characteristic Tripping Curves
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-3
7000
6000
5000
CIRCUIT BREAKER INFORMATION
4000
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
110
120/240
2
3000
1
9
8
7
10000
9000
8000
6
6000
5
5000
4
4000
3
3000
80
90
100
60
50
40
30
20
15
8
9
10
7
6
5
4
2
1.5
.8
.9
1
.7
.6
70
10
90
80
70
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-4
7000
60
50
CIRCUIT BREAKER INFORMATION
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
125
120/240
2
40
30
2000
2
2000
20
1500
1
1500
15
1000
900
800
1
9
8
1000
900
800
10
90
80
700
7
700
70
600
6
600
60
500
5
500
400
4
400
MAXIMUM SINGLE POLE TRIP TIME AT 25°C
BASED ON NEMA AB-2, 1980
50
40
MAXIMUM SINGLE POLE TRIP TIME AT 25°C
BASED ON NEMA AB-2, 1980
3
300
200
2
200
20
150
1
150
15
300
100
90
80
70
70
60
60
50
50
40
40
30
30
20
20
15
15
10
9
8
10
9
8
7
7
6
6
TIME IN SECONDS
100
90
80
5
4
3
2
30
5
4
3
2
1.5
1.5
1
.9
.8
1
.9
.8
.7
.7
.6
.6
.5
.5
.4
.4
.3
.3
.2
.2
.15
.15
.1
.09
.08
.1
.09
.08
.07
.07
.06
.06
.05
.05
.04
.04
.03
.03
.02
.01
.009
.008
1
6
© 1997 Square D All Rights Reserved
10/97
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.005
.7
.005
.6
.006
.006
.5
2 CYCLE
(60 Hz)
.007
2
2 CYCLE
(60 Hz)
1.5
1
.007
1 CYCLE
(60 Hz)
.7
.01
.009
.008
.015
.6
1 CYCLE
(60 Hz)
.8
.9
1
.02
.015
.5
TIME IN SECONDS
.5
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
.5
10000
9000
8000
3
MULTIPLES OF RATED CURRENT
MULTIPLES OF RATED CURRENT
Characteristic Tripping Curves
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-5
1
9
8
10000
9000
8000
7
7000
6000
6
6000
5000
5
5000
4
4000
7000
CIRCUIT BREAKER INFORMATION
4000
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
100 & 125
120/240
2
3000
3
80
90
100
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
70
1
9
8
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-6
7
6
5
CIRCUIT BREAKER INFORMATION
4
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
150-175
120/240
2
3000
3
2000
2
2000
2
1500
1
1500
1
1000
900
800
1
9
8
1000
900
800
1
9
8
700
7
700
7
600
6
600
6
500
5
500
5
4
400
300
3
300
200
2
200
2
150
1
150
1
MAXIMUM SINGLE POLE TRIP TIMES AT 25° C
BASED ON NEMA AB-2, 1980
400
100
90
80
70
70
60
60
50
50
40
40
30
30
20
20
15
15
10
9
8
10
9
8
7
7
6
6
TIME IN SECONDS
100
90
80
5
4
3
2
1.5
4
MAXIMUM SINGLE POLE TRIP TIMES AT 25° C
BASED ON NEMA AB-2, 1980
3
5
4
3
2
1.5
125A
1
.9
.8
1
.9
.8
.7
175A
.7
100A
.6
.6
.5
.5
.4
.4
.3
.3
.2
.2
.15
.15
.1
.09
.08
.1
.09
.08
.07
.07
.06
.06
.05
.05
.04
.04
.03
.03
150A
.02
1
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
.7
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.005
.8
.9
1
.005
.7
.006
.6
2 CYCLE
(60 Hz)
.007
.006
.6
.007
.01
.009
.008
3
2 CYCLE
(60 Hz)
2
1
1 CYCLE
(60 Hz)
.5
.01
.009
.008
.015
1.5
1 CYCLE
(60 Hz)
.8
.9
1
.02
.015
.5
TIME IN SECONDS
.5
80
90
100
70
60
50
40
MULTIPLES OF RATED CURRENT
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
.5
MULTIPLES OF RATED CURRENT
10000
9000
8000
7
10/97
© 1997 Square D All Rights Reserved
Characteristic Tripping Curves
10000
9000
8000
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
.5
MULTIPLES OF RATED CURRENT
1
9
8
QOM FAMILY MOLDED CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 736-7
7000
7
6
6000
5000
5
CIRCUIT BREAKER INFORMATION
4
4000
Circuit Breaker
Prefix
Continuous
Ampere Rating
Maximum
AC Voltage
Number
of Poles
QOM1, QOM1-VH
200-225
120/240
2
3000
3
2000
2
1500
1
1000
900
800
1
9
8
700
7
600
6
5
500
400
4
MAXIMUM SINGLE POLE TRIP TIMES AT 25° C
BASED ON NEMA AB-2, 1980
300
3
200
2
150
1
100
90
80
70
60
50
40
30
20
15
10
9
8
TIME IN SECONDS
7
6
5
4
3
2
1.5
1
.9
.8
.7
.6
.5
225A
.4
200A
.3
.2
.15
.1
.09
.08
.07
.06
.05
.04
(
.03
.02
.015
1 CYCLE
(60 Hz)
.01
.009
.008
1
2 CYCLE
(60 Hz)
.007
.006
Square D Company
3700 Sixth Street SW
Cedar Rapids, IA 52406 USA
(319) 369-6600
80
90
100
70
60
50
40
30
20
15
8
9
10
7
6
5
4
3
2
1.5
.8
.9
1
.7
.6
.5
.005
Square D and s are registered trademarks of Square D Company
0736CT9701 Nov 97 Printed in U.S.A. © 1997 Square D All Rights Reserved