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 load centers, NQOD and NQ panelboards, NQOD and NQ OEM interiors or Speed-D switchboard distribution panels. Bolt-on QOB circuit breakers are for use in NQOD 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.

QO 1P
1 Space Required


QO 2P
2 Spaces Required


QO 3P
3 Spaces Required


QO2200 2P 200 A
4 Spaces Required

Standard QO Plug-On Circuit Breakers

Amperes
Rating [2]

1P—120/240 Vac

2P—120/240 Vac
Common Trip

2P—240 Vac   [3]
Common Trip

3P—240 Vac
Common Trip

10 k AIR

10 A

QO110

QO210

QO310

15 A

QO115 [4] [5]

QO215 [4]

QO215H

QO315 [4]

20 A

QO120 [4] [5]

QO220 [4]

QO220H

QO320 [4]

25 A

QO125 [4]

QO225 [4]

QO225H OBS

QO325 [4]

30 A

QO130 [4]

QO230 [4]

QO230H

QO330 [4]

35 A

QO135 [4]

QO235 [4]

QO335 [4]

40 A

QO140 [4]

QO240  [4]

QO240H

QO340 [4]

45 A

QO145 OBS

QO245 [4]

QO345 [4]

50 A

QO150 [4]

QO250 [4]

QO250H OBS

QO350 [4]

60 A

QO160 [4]

QO260 [4]

QO260H OBS

QO360 [4]

70 A

QO170 [4]

QO270 [4]

QO270H OBS

QO370 [4]

80 A

QO280 [4]

QO280H OBS

QO380 [4]

90 A

QO290 [4]

QO290H OBS

QO390 [4]

100 A

QO2100 [4]

QO2100H

QO3100 [4]

110 A

QO2110 [4]

125 A

QO2125 [4]

150 A

QO2150 [4] [6] [7]

175 A

QO2175  [4] [6] [7]

200 A

QO2200 [4] [6] [7]

Molded Case Switch 60 A max.–240 Vac

QO200

QO300 OBS

Molded Case Switch 100 A max.–240 Vac

QO2000 OBS

QO3000 OBS

22 k AIR [4]

15 A

QO115VH [5]

QO215VH [8]

QO315VH [8]

20 A

QO120VH [5]

QO220VH [8]

QO320VH [8]

25 A

QO125VH OBS

QO225VH [8]

QO325VH [8]

30 A

QO130VH

QO230VH [8]

QO330VH [8]

40 A

QO140VH

QO240VH [8]

QO340VH [8]

50 A

QO150VH

QO250VH [8]

QO350VH [8]

60 A

QO160VH

QO260VH [8]

QO360VH [8]

70 A

QO170VH

QO270VH [8]

QO370VH [8]

80 A

QO280VH [8]

QO380VH [8]

90 A

QO290VH [8]

QO390VH [8]

100 A

QO2100VH [8] [9]

QO3100VH [8]

110 A

QO2110VH [8] [9]

125 A

QO2125VH [8] [9]

150 A

QO2150VH [6] [8] [7]

175 A

QO2175VH OBS

200 A

QO2200VH [6] [8] [7]

42 k AIR [4]

 40 A

QOH240 OBS

 45 A

QOH245 OBS

 50 A

QOH250 OBS

 60 A

QOH260 [10]

 70 A

QOH270

 80 A

QOH280

 90 A

QOH290

100 A

QOH2100

110 A

QOH2110 [10]

125 A

QOH2125

65 k AIR [4]

 15 A

QH115 OBS

QH215 OBS

QH315 OBS

 20 A

QH120 [5]

QH220

QH320 OBS

 25 A

QH125 OBS

QH225 OBS

QH325 [10]

 30 A

QH130 OBS

QH230

QH330 OBS

OBS This product is obsolete.

Refer to QO for Interrupting Ratings, Accessories, and Dimensions.

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
(AWG/kcmil)

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 1P Tandem
1 Space Required

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

QOT1515

15 A and 20 A

QOT1520

20 A and 20 A

QOT2020

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

QO1515

15 A and 20 A

QO1520

20 A and 20 A

QO2020

20 A and 30 A

QO2030

30 A and 20 A

QO3020

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

QO20303020 [11]

30 A and 20 A

Class 685, 690, 730, 912, 950 / Refer to Catalog: 0730CT9801

QO Ground-Fault Circuit Breakers (GFI)

1P
QO-GFI

2P
QO-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
[12]

Qwik-Gard Circuit Breakers With Ground Fault Circuit Interrupter

1P 120 Vac

2P Common Trip
120/240 Vac

3P Common Trip
208Y/120 Vac

10 k AIR
1 Space Required

22 k AIR
1 Space Required

10 k AIR
2 Spaces Required

10 k AIR
3 Spaces Required

Ground-Fault Circuit Interrupter
(Pigtail Neutral)

15

QO115GFI

QO115VHGFI

QO215GFI

QO315GFI

20

QO120GFI

QO120VHGFI

QO220GFI

QO320GFI

25

QO225GFI

30

QO130GFI

QO130VHGFI OBS

QO230GFI

QO330GFI

35

QO235GFI

40

QO240GFI

QO340GFI

45

QO245GFI

50

QO250GFI

QO350GFI

60

QO260GFI  [13]

Plug-On Neutral Ground-Fault Circuit Interrupter

15

QO115PGFI[14]

20

QO120PGFI[14]

OBS This product is obsolete.

QO Arc-Fault Circuit Breaker (QO-CAFI)

1P

QO-CAFI

Plug-On Neutral

1P

QO-CAFI

Pigtail

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
Rating

One–Pole 120 Vac

Two–Pole 120/240 Vac

10 k AIR
1 Space Required

22 k AIR
1 Space Required

10 k AIR
2 Space Required

22 k AIR
2 Space Required

Combination Arc-fault Interrupter
(Pigtail Neutral)

15

20

QO115CAFI

QO120CAFI

QO115VHCAFI

QO120VHCAFI

QO215CAFI [15]

QO220CAFI [15]

QO215VHCAFI OBS

QO220VHCAFI OBS

Plug-On Neutral Combination Arc-fault Interrupter

15

20

QO115PCAFI

QO120PCAFI

QO115VHPCAFI

QO120VHPCAFI

OBS This product is obsolete.

QO Dual Function Circuit Breaker

1P QO-DF

Plug-on Neutral

1P QO-DF

Pigtail

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
Rating

1P 120 Vac
10 k AIR
1 Space Required

1P 120 Vac
22 k AIR
1 Space Required

Combination Arc-fault and Ground Fault Circuit Interrupter (Pigtail Neutral)

15

20

QO115DF

QO120DF

QO115VHDF OBS

QO120VHDF

Plug-On Neutral Combination Arc-fault and Ground Fault Circuit Interrupter

15

20

QO115PAFGF

QO120PAFGF

QO115VHPAFGF

QO120VHPAFGF

OBS This product is obsolete.

QO-EPD/EPE Circuit Breakers

QO 1P
With Shunt Trip

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
[12]

1P
120 Vac
10 k AIR
1 Space Required

2P Common Trip
120/240 Vac
10 k AIR
2 Spaces Required

3P Common Trip
240 Vac
10 k AIR
3 Spaces Required

15

QO115EPD

QO215EPD

QO315EPD OBS

QO315EPE [16]

20

QO120EPD

QO220EPD

QO320EPD [16]

QO320EPE [16]

25

QO125EPD OBS

QO225EPD

30

QO130EPD

QO230EPD

QO330EPD [16]

QO330EPE [16]

40

QO240EPD

QO340EPD [16]

QO340EPE [16]

50

QO250EPD

QO350EPD [16]

QO350EPE [16]

60

QO260EPD [13]

OBS This product is obsolete.

QO Switch Neutral Common Trip Circuit Breakers (QO-SWN)

Two-wire
QO-SWN

Three-wire
QO-SWN

Switch Neutral Common Trip 2008 NEC® 514.11

QO-SWN Circuit Breakers

Ampere
Rating [12]

2 Wire 120 Vac
10 k AIR
2 Spaces Required

3 Wire 120/240 Vac
10 k AIR
3 Spaces Required

10

QO210SWN OBS

QO310SWN

15

QO215SWN

QO315SWN OBS

20

QO220SWN

QO320SWN

25

QO225SWN OBS

QO325SWN

30

QO230SWN OBS

QO330SWN OBS

40

QO240SWN OBS

QO340SWN OBS

50

QO250SWN OBS

QO350SWN OBS

OBS This product is obsolete.

QO High Intensity Discharge Circuit Breakers (QO-HID)

HID circuit breakers are for use on circuits feeding fluorescent and high intensity discharge (HID) lighting systems such as mercury vapor, metal halide, or high pressure sodium. These circuit breakers are physically interchangeable with QO circuit breakers.

QO-HID Circuit Breakers

Ampere
Rating [12]

1P 120/240 Vac
10 k AIR
1 Space Required

2P Common Trip
120/240 Vac
10 k AIR
2 Spaces Required

3P Common Trip
240 Vac
10 k AIR
3 Spaces Required

15

QO115HID OBS

QO215HID OBS

QO315HID OBS

20

QO220HID

QO320HID

25

QO125HID OBS

QO225HID OBS

QO325HID OBS

30

QO130HID OBS

QO230HID OBS

QO330HID OBS

40

QO140HID OBS

QO240HID OBS

50

QO150HID OBS

QO250HID OBS

OBS This product is obsolete.

QO Key Operated Circuit Breakers (QO-K)

QO-K Key Operated

Key operated QO circuit breakers are available in single-pole construction and can be mounted in any single-pole space which will accept a standard QO circuit breaker. These circuit breakers can be turned ON or OFF or to RESET with a special key (catalog number QOK10) included with the circuit breaker. These circuit breakers are UL Listed and available as shown in the table.

QO-K Circuit Breakers

120 Vac—10 k AIR (1 Space Required)

Ampere
Rating [12]

Cat. No.

Ampere
Rating  [12]

Cat. No.

10

QO110K OBS

25

QO125K

15

QO115K OBS

30

QO130K OBS

20

QO120K OBS

OBS This product is obsolete.

QO High Magnetic Trip Circuit Breakers (QO-HM)

High magnetic trip circuit breakers are recommended for applications where high initial inrush may occur and for individual dimmer applications.

QO-HM Circuit Breakers

120 Vac—10 k AIR

Ampere Rating [12]

1P

15 A

QO115HM [4] [5]

20 A

QO120HM [4] [5]

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.

QO Non-Automatic Miniature Switches, 240 Vac 10 kA

Ampere Rating

2P

3P

 60

QO200

QO300

100

QO2000 OBS

QO3000

OBS This product is obsolete.

Footnotes

  1. See Digest Section 1 for load centers, and Section 9 for panelboards and interiors.
  2. 10–30 A circuit breakers are suitable for use with 60oC or 75oC conductors. 35–125 A circuit breakers are suitable for use with 75oC conductors.
  3. UL Listed 5 k AIR on corner grounded Delta systems.

  4. UL Listed as HACR type for use with air conditioning, heating and refrigeration equipment haing motor group combinations and marked for use with HACR type circuit breakers.
  5. UL Listed as SWD (switching duty) rated. Suitable for switching 120 Vac fluorescent lighting loads.
  6. Requires four spaces (1 AWG–300 kcmil Al/Cu.) Suitable for switching 120 Vac fluorescent lighting loads.
  7. Not suitable for use in 3Ø panels. Use only in 1Ø panel rated 150 A or greater.
  8. UL Listed for use ahead of QO, QO-GFI, QO-EPD, QOT, QO-AFI, and QO-PL 10 k AIR circuit breakers to permit their application at 22 kA fault level.
  9. 100 A maximum branch mounted opposite.
  10. Order only. Contact your local Field Office.
  11. Includes two circuit breakers (one QO2030 and one QO3020) and handle tie QOTHT.
  12. 10–30 A circuit breakers are suitable for use with 60oC or 75oC conductors. 35–60 A circuit breakers are suitable for use with 75oC conductors.
  13. Suitable only for feeding 240 Vac and 208 Vac two-wire loads. Does not contain load neutral connection.
  14. New Plug-On Neutral
  15. For 120/240 V only, not for 208Y/120 V.
  16. See note in Instruction Bulletin when using in an enclosure with a QO403 or QON prefix.

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