QO Plug-On Circuit Breakers
Class 730, 731, 733 / Refer to Catalog: 0730CT9801
QO Standard Plug-On Circuit Breakers
Square D brand QO miniature circuit breakers are plug-on products for use in QO and QON load centers, NQ panelboards, NQ OEM interiors or Speed-D™ switchboard distribution panels. Bolt-on QOB circuit breakers are for use in NQOB and NQ panelboards or interiors. [1]
The Square D exclusive Qwik-Open™ mechanism, with a trip reaction within 1/60th of a second, is standard on all 1P 15 and 20 A QO circuit breakers.
Standard QO Plug-On Circuit Breakers
Amperes |
1P—120/240 Vac |
2P—120/240
Vac |
2P—240 Vac [3] |
3P—240 Vac |
---|---|---|---|---|
10 k AIR |
||||
10 A |
— |
|||
15 A |
||||
20 A |
||||
25 A |
QO225H OBS |
|||
30 A |
||||
35 A |
— |
|||
40 A |
||||
45 A |
QO145 OBS |
— |
||
50 A |
QO250H OBS |
|||
60 A |
QO260H OBS |
|||
70 A |
QO270H OBS |
|||
80 A |
— |
QO280H OBS |
||
90 A |
— |
QO290H OBS |
||
100 A |
— |
|||
110 A |
— |
— |
— |
|
125 A |
— |
— |
— |
|
150 A |
— |
— |
— |
|
175 A |
— |
— |
— |
|
200 A |
— |
— |
— |
|
Molded Case Switch 60 A max.–240 Vac |
— |
QO300 OBS |
||
22 k AIR [4] |
||||
15 A |
— |
|||
20 A |
— |
|||
25 A |
— |
— |
||
30 A |
— |
|||
40 A |
— |
|||
50 A |
— |
— |
||
60 A |
— |
|||
70 A |
—
|
— |
||
80 A |
— |
— |
||
90 A |
— |
— |
||
100 A |
— |
— |
||
110 A |
— |
— |
— |
|
125 A |
— |
— |
— |
|
150 A |
— |
— |
— |
|
175 A |
— |
QO2175VH OBS |
— |
— |
200 A |
— |
— |
— |
|
42 k AIR [4] |
||||
40 A |
— |
QOH240 OBS |
— |
— |
45 A |
— |
QOH245 OBS |
— |
— |
50 A |
— |
QOH250 OBS |
— |
— |
60 A |
— |
— |
— |
|
70 A |
— |
— |
— |
|
80 A |
— |
— |
— |
|
90 A |
— |
— |
— |
|
100 A |
— |
— |
— |
|
110 A |
— |
— |
— |
|
125 A |
— |
— |
— |
|
65 k AIR [4] |
||||
15 A |
QH115 OBS |
QH215 OBS |
— |
QH315 OBS |
20 A |
— |
QH320 OBS |
||
25 A |
QH125 OBS |
QH225 OBS |
— |
|
30 A |
QH130 OBS |
— |
QH330 OBS |
|
OBS This product is obsolete. |
Refer to QO for Interrupting Ratings, Accessories, and Dimensions. |
QO/QOB 48 Vdc 5 kA
Ampere Rating |
Poles |
Suffix |
---|---|---|
10–60 A |
2 |
5272 |
QO/QOB Ring Terminal
QO/QOB Ring Terminal—Factory-Installed Only
Ampere Rating |
Poles |
Suffix |
---|---|---|
10–30 A |
1, 2, 3 |
5237 |
35–60 A |
1,2 |
5238 |
35–50 A |
3 |
|
70–110 A |
2 |
5273 |
60–100 A |
3 |
Wire Sizes for QO/QOB Circuit Breakers
Wire Sizes for QO/QOB Circuit Breakers
Circuit Breaker Type |
Ampere Rating [2] |
Wire Size |
---|---|---|
QO 1P |
10–30 A |
14–8 Al/Cu |
10–30 A |
(2) 14–10 Cu |
|
35–70 A |
8–2 Al/Cu |
|
QO 2P |
10–30 A |
14–8 Al/Cu |
10–30 A |
(2) 14–10 Cu |
|
35–70 A |
8–2 Al/Cu |
|
80–125 A |
4–2/0 Al/Cu |
|
150–200 A |
4–300 Al/Cu |
|
QO 3P |
10–30 A |
14–8 Al/Cu, (2) 14-10 Cu |
35–70 A |
8–2 Al/Cu |
|
80–125 A |
4–2/0 Al/Cu |
|
QOB-VH |
110–150 A |
4–300 Al/Cu |
QOT |
15–20 A |
12–8 Al 14–8 Cu |
QO-AFI, QO-GFI or QO-EPD |
15–30 A |
12–8 Al 14–8 Cu |
40, 50, 60 A |
12–4 Al 14–6 Cu |
|
QO-PL |
10–60 A |
12–2 Al 14–2 Cu |
QOT and QO Tandem Circuit Breakers
QOT tandem circuit breakers have a mounting cam as shown. Installation into a QO load center can only be made in those positions having a mounting pan rail slot. Meets Paragraph 408.54 of the NEC®. UL Listed as Class CTL.
QOT Tandem Circuit Breakers (CTL)—Not Compatible with Plug-on Neutral Systems
Ampere Rating [2] |
Cat. No. [4] |
---|---|
1P—120/240 Vac |
|
15 A and 15 A |
|
15 A and 20 A |
|
20 A and 20 A |
|
2P—120/240 Vac Common Trip |
|
Order two QOT1515 or QOT2020 circuit breakers and handle tie QOTHT for common switching of center two poles. |
QO Tandem Circuit Breakers (non-CTL)—Compatible with Plug-on Neutral Systems
Ampere Rating [2] |
Cat. No. [4] |
---|---|
1P—120/240 Vac—1 Space Required |
|
15 A and 15 A |
|
15 A and 20 A |
|
20 A and 20 A |
|
20 A and 30 A |
|
30 A and 20 A |
|
Two 1P Individual Trip—120/240 Vac—2 Spaces Required |
|
15 A and 15 A |
Order two QO1515 or QO2020 circuit breakers and handle tie QOTHT |
15 A and 20 A |
|
20 A and 20 A |
— |
20 A and 30 A |
|
30 A and 20 A |
— |
note
Class 685, 690, 730, 912, 950 / Refer to Catalog: 0730CT9801
QO Ground-Fault Circuit Breakers (GFI)
Qwik-Gard™ circuit breakers provide overload and short circuit protection, combined with Class A ground fault protection. Class A denotes a ground fault circuit interrupter that will trip when a fault current to ground is 6 mA or more, for people protection. Do not connect to more than 250 feet of load conductor for the total one-way run to prevent nuisance tripping.
QO-GFI Circuit Breakers
Circuit Breaker Type |
Ampere Rating |
Qwik-Gard Circuit Breakers With Ground Fault Circuit Interrupter |
|||
---|---|---|---|---|---|
1P 120 Vac |
2P Common Trip |
3P Common Trip |
|||
10 k AIR |
22 k AIR |
10 k AIR |
10 k AIR |
||
Ground-Fault Circuit
Interrupter |
15 |
||||
20 |
|||||
25 |
— |
— |
— |
||
30 |
— |
||||
35 |
— |
— |
— |
||
40 |
— |
— |
|||
45 |
— |
— |
— |
||
50 |
— |
— |
|||
60 |
— |
— |
— |
||
Plug-On Neutral Ground-Fault Circuit Interrupter |
15 |
— |
— |
— |
|
20 |
— |
— |
— |
QO Arc-Fault Circuit Breaker (QO-CAFI)
QO arc-fault circuit breakers provide protection for Series and Parallel Type Arcing as required by the NEC and local code adoption, and comply with UL1699.
QO-CAFI Circuit Breakers
Circuit Breaker Type [4] |
Ampere |
One–Pole 120 Vac |
Two–Pole 120/240 Vac |
|
---|---|---|---|---|
10 k AIR |
22 k AIR |
10 k AIR |
||
Combination
Arc-fault Interrupter |
15 20 |
|||
Plug-On Neutral Combination Arc-fault Interrupter |
15 20 |
— |
QO Dual Function Circuit Breaker
QO Combination Arc Fault and Ground Fault Circuit Interrupters (Dual Function) provide overload and short circuit protection, plus arc fault and ground fault protection in accordance with the NEC, UL1699 and UL943.
QO-DF Circuit Breakers
Circuit Breaker Type [4] |
Ampere |
1P 120 Vac |
1P 120 Vac |
---|---|---|---|
Combination Arc-fault and Ground Fault Circuit Interrupter (Pigtail Neutral) |
15 20 |
— |
|
Plug-On Neutral Combination Arc-fault and Ground Fault Circuit Interrupter |
15 20 |
QO-EPD/EPE Circuit Breakers
QO-EPD/EPE circuit breakers provide overload and short circuit protection combined with Class B ground fault protection. They are designed to provide ground fault protection of equipment at a 30 mA level (EPD) or 100 mA level (EPE). They are not designed to protect people from electrical shock.
QO-EPD Circuit Breakers
Ampere Rating |
1P |
2P Common Trip |
|
---|---|---|---|
15 |
|||
20 |
|||
25 |
QO125EPD OBS |
— |
|
30 |
|||
40 |
— |
||
50 |
— |
||
60 |
— |
— |
|
OBS This product is obsolete. |
QO Switch Neutral Common Trip Circuit Breakers (QO-SWN)
QO High Intensity Discharge Circuit Breakers (QO-HID)
QO High Magnetic Trip Circuit Breakers (QO-HM)
Non-Automatic (Standard) Miniature Switches
Miniature non-automatic switches have the same physical packaging as miniature circuit breakers, but open only when the handle is switched to the OFF position.
Non-automatic switches provide no overcurrent protection or short circuit protection. They must not be used on systems that have an available fault current greater than the values listed in the table. Non-automatic switches are UL Listed per UL 1087 and are CSA certified.