QO(B) Circuit Breakers

Exclusive Visi-Trip® indicator provides clear and instant identification of a tripped circuit breaker.

The industry leader in circuit protection is easily recognized by the industry's only trip indicator—the red Visi-Trip® Indicator makes it easy to spot a tripped circuit breaker. Compact 3/4 in. wide format for one-pole circuit breakers helps minimize panel space and footprint. The Square D® exclusive Qwik-Open® protection is standard on all 15 A and 20 A circuit breakers— trip reaction within 1/60th of a second. No other circuit breaker trips faster. A comprehensive selection of 10kA rated circuit breakers is available including:

  • QO® one-pole standard circuit breakers (10 A to 70 A)
  • QO two-pole standard circuit breakers (10 A to 200A)
  • QO three-pole standard circuit breakers (10 A to 100 A)
  • QO tandem circuit breakers (15 A to 20 A)
  • QO ground-fault circuit interrupters (1- and 2-pole, 15 A to 60 A; 3-pole 15 A - 50 A)
  • QO-EPD circuit breakers with 30 mA equipment ground-fault protection (1-pole, 2-pole, 15 A to 60 A; 3-pole, 15 A - 50 A)
  • Square D arc-fault circuit interrupters (1-pole, 15 A and 20 A)
  • Square D combination arc-fault circuit interrupters (1-pole, 15 A and 20 A)
  • QO-K circuit breakers, key operated (1-pole, 10 A to 30A)
  • QO-SWN circuit breakers with switch neutral common trip, NEC 514-5 (2- and 3-pole, 10 A to 50 A)
  • QO-HID circuit breakers for circuits feeding fluorescent or high intensity discharge (1-, 2-, and 3-pole, 15 A to 50 A)
  • A full line of factory installed accessories, such as shunt trips, auxiliary switches and alarm switches, is also available.
  • QO sub-feed lugs, 2-pole rated 60A, 125A and 225A; 3-pole rated 125A.
  • Additional products available with interrupting ratings of 22kA, 42kA and 65kA.

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

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For a complete listing of documentation for this product, please consult the Technical Library.

Brochures
Water Process OEM Solutions 9510BR0901
Catalogs
QO and QOB Miniature Circuit Breakers 0730CT9801
Residential Products Catalog 0110PL9401
declarations
Low Voltage Circuit Breakers
QO Low Voltage Circuit Breakers, Types QOB, QOH, QO2
QO Molded Case Circuit Breakers
QO Molded Case Circuit Breakers, Type QOB
QO Molded Case Circuit Breakers, Types QOBX and QOXD
QO Molded Case Circuit Breakers/residual current devices
drawings
High Amp QO 2-pole miniature circuit breakers 48118-835-01
Handouts
Back-Fed Main Circuit Breaker Retaining Kit Handout 1100HO9902
Kitchen Ventilation Systems Manufacturer Improves Breaker Protection without Sacrificing Performance 8000AC0721
QO and QOB Miniature Circuit Breakers with Ground Fault Protection 0730HO0901
Square D® Residential Products 0102HO0501
Product Data Bulletins
Determining Current Carrying Capacity in Special Applications 0100DB0101
International Miniature Circuit Breakers 0739DB9901
The Truth About AFCIs 0760DB0201
Wire Conductor Ampacity to Temperature Rating 0600DB0103
trip curves
10 A QO, 1-, 2-, 3-pole Circuit Breaker 730-1
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 110 A 2 730-8
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 110-150 A 2,3 730-10
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 125 A 2 730-9
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 15 A 1 730-2
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 15-20 A 2,3 730-4
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 20 A 1 730-3
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 30-40 A 1,2,3 730-5
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 50-70 A 1,2,3 730-6
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO 80-100 A 2,3 730-7
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO-MBGX 16?20 A 2 910-6
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO-MBGX 32 A 2 910-7
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO-MBGX 45?63 A 2 910-8
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO-MBX 70 A 2 740-14
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO-MBX 80?100 A 2 740-15
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QO/QOB-AS 15-30 A 1,2,3 730-11
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QOH/QO-H,VH 40 & 50 A 2,3 730-12
LOAD CENTER AND PANELBOARD CIRCUIT BREAKERS QOH/QO-H,VH 60 & 70 A 2,3 730-13
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 110-125 A 2 733-6
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 15 A 1,2,3 733-1
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 150 A 2 733-7
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 20-25 A 1,2,3 733-2
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 30 A 1,2,3 733-3
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 35-50 A 1,2,3 733-4
OBSOLETE PANELBOARD CIRCUIT BREAKERS Q1 60-100 A 1,2,3 733-5
QO® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO. 736-9 736-9
QO® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO. 910-1 910-1
QO® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO. 910-2 910-2
QO® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO. 910-3 910-3
QO® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO. 910-4 910-4
QO® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO. 910-5 910-5
User Manuals
HQO306 and HQO206 Adapters 48040-902-02
Installation Information for QO2175SB Surgebreaker Secondary Surge Arrester 48040-979-01
Main Circuit Breaker Installation for Homeline® Series S1 and QO Series S1, T4, and G1 Load Centers 48940-013-03
Q1100AN Series 3 Neutral Terminal Kit 48049-115-01
Q2, Q2l and Q2B Circuit Breakers 48940-188-01
QO 150-200 A Circuit Breaker and QO 225 A Sub-feed Lug 48840-225-01
QO Circuit Breaker and Arc-fault Circuit Interrupter (AFCI) 48840-123-04
QO Circuit Breaker Meter Mains 40271-280-02
QO-PLILC (Plug-on) Powerlink Remotely Operated Circuit Breakers 48840-496-10
QOM2 Main Circuit Breaker for QO Series S _ _ and HOM Series S _ _ Load Centers 48940-014-05
Three-Pole QO/QOB Circuit Breaker and Ground Fault Circuit Interrupter (GFCI) 48840-260-01
Three-Pole QO®/QOB Circuit Breaker and Equipment Protective Device (EPD) 48840-261-01