QO® and QOB Miniature Circuit Breakers Catalog 0730CT9801R1/08 2008 Class 730 CONTENTS Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3 Special Application Circuit Breakers. . . . . . . . . . . . . . . . . . . . . . . . . . Page 7 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
QO® and QOB Miniature Circuit Breakers General Information General Information 07303090 07303095 QO® and QOB Circuit Breakers 1 Pole QO® (plug-on) and QOB (bolt-on) one-, two- and three-pole thermal-magnetic circuit breakers provide overcurrent protection and switching on ac and dc systems. Plug-on QO circuit breakers are for use in QO load centers, NQ and NQOD panelboards, OEM mounting bases, and Speed-D® switchboard distribution panels.
QO® and QOB Miniature Circuit Breakers General Information Ratings When designing an electrical distribution system, overcurrent protective devices are generally selected based on performance requirements. Factors influencing this selection include system voltage, continuous current, interrupting rating, and frequency. Voltage Rating The circuit breaker must have a voltage rating greater than, or equal to, the system voltage. When a circuit breaker clears an overcurrent, it is done in two steps.
QO® and QOB Miniature Circuit Breakers General Information Interrupting Rating The interrupting rating of a circuit breaker is the highest current at rated voltage that the circuit breaker is intended to interrupt under standard test conditions. A circuit breaker must be chosen so that the interrupting rating is equal to or greater than the maximum available short-circuit current at the point where the circuit breaker is applied in the system.
QO® and QOB Miniature Circuit Breakers General Information Temperature Rating To meet the requirements of Underwriters Laboratories Standard 489, molded case circuit breakers are designed, built, and calibrated for us on 60 Hz ac systems in 40°C (104°F) ambient temperature. When applied at ambient temperatures other than 40°C, the current-carrying capacity and/or trip charasteristics of the circuit breaker may vary.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers Switching Duty (SWD) Circuit Breakers QO and QOB circuit breakers are suitable for switching 120 Vac fluorescent lighting loads. The switching duty (SWD) listing applies only to one-pole 15 and 20 A circuit breakers rated at 347 Vac or less. The circuit breakers are subjected to specified temperature rise tests at predetermined periods during the endurance operations.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers QO-HM and QOB-HM High Magnetic Circuit Breakers QO-HM and QOB-HM high-magnetic circuit breakers are recommended for area lighting (such as athletic fields, parking lots, and outdoor signs), when using lamps of inherent high inrush current, individual dimmer applications or other applications where high inrush currents exceed standard tripping conditions. These circuit breakers are available in one-pole 15 and 20 A ratings only.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers 07303093 QO-GFI and QOB-GFI Qwik-Gard® Ground-Fault Circuit Interrupters Qwik-Gard® Ground-Fault Circuit Interrupters offer a means of providing ground-fault protection for people. Qwik-Gard “people protection” ground-fault circuit interrupters are built as Class A devices in accordance with UL Standard 489 and CSA C22.2 #144 for ground-fault circuit interrupters (GFCIs).
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers Proper Application of Qwik-Gard GFCIs • Do not connect to swimming pool equipment installed before adoption of the 1965 National Electric Code • Do not connect to electrical ranges or clothes dryers whose frames are grounded by a connection to the grounded circuit conductor. • Do not use as a main circuit breaker in a panelboard or in reverse connected (backfed) applications. • Do not megger, high-voltage or hi-pot test.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers Two-Pole Qwik-Gard GFCIs Two-pole Qwik-Gard GFCIs can be installed on a 120/240 Vac 1Ø3W system, the 120/240 Vac portion of a 120/240 Vac 3Ø4W system, or two phases and neutral of a 208Y/120 Vac 3Ø4W system. Regardless of the application, connections must be made to two “hot” busses and the panel neutral assembly.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers QO-EPD and QOB-EPD Equipment Protection Devices QO-EPD and QOB-EPD circuit breakers are one- and two-pole thermal-magnetic circuit breakers with integral equipment ground-fault protection. These circuit breakers are rated for use on 120/240 Vac and 120/208 Vac electrical systems to provide overcurrent protection, short-circuit protections and equipment ground-fault protection.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers 07303097 QO-PL and QOB-PL Powerlink® Remotely Operated CIrcuit Breakers QO-PL and QOB-PL circuit breakers combine overcurrent and short-circuit protection with remote switching. These circuit breakers are ideal for lighting loads or wherever power switching is required.
QO® and QOB Miniature Circuit Breakers Special Application Circuit Breakers Figure 4: Typical AFCI Circuit Breaker Installation 120/240 Vac Source N B A 07303107 Hot Duplex Receptacle 120 V 120 V 240 V S/N GND One-pole AFCI Circuit Breaker 120 V Neutral Equipment Ground AFCI Circuit Breaker Installation 14 07/2008 © 1998–2008 Schneider Electric All Rights Reserved
QO® and QOB Miniature Circuit Breakers Accessories Accessories Most QO and QOB circuit breakers can be supplied with electrical accessories factory-installed on one-, two- or three-pole circuit breakers. Electrical accessories are not available on AFCI circuit breakers. Handle accessories are also available for field installation on QO and QOB circuit breakers. All fieldinstalled handle accessories must be ordered separately.
QO® and QOB Miniature Circuit Breakers Accessories Auxiliary Switch The auxiliary switch accessory monitors the circuit breaker contact status and provides a remote signal indicating whether the circuit breaker contacts are open or closed. When the circuit breaker is off or tripped, the auxiliary switch with an “A” contact is open and the auxiliary switch with a “B” contact is closed.
QO® and QOB Miniature Circuit Breakers Accessories Handle Accessories Field-installed handle accessories are also available. Table 6: Field-Installable Handle Accessories Accessory Handle Tie Handle Clamp Handle Padlock Attachment for Padlocking in ON or OFF Position Handle Padlock Attachment for Padlocking in OFF Position Sub-Feed Lugs Description Catalog Number Converts any two adjacent 120/240 Vac 1P QO circuit breakers to independent trip 2P.
QO® and QOB Miniature Circuit Breakers Accessories Handle Tie The handle tie accessory converts any two adjacent one-pole QO circuit breakers to one independent trip multi-pole circuit breaker. Handle Lock-Off (Clamp) The handle lock-off accessories fasten the handle in the ON or OFF position. These handle lock-offs cannot be padlocked. Handle Padlock Attachment The handle padlock attachment allows padlocking the circuit breaker handles in either the ON or OFF position or in the OFF only position.
QO® and QOB Miniature Circuit Breakers Trip Curves Trip Curves The tripping characteristics of QO and QOB circuit breakers can be represented by a characteristic tripping curve that plots tripping time versus current level. The curve shows the amount of time required by a circuit breaker to trip at a given overcurrent level. The curve has a performance band that is bound by a minimum and a maximum value of clearing time.
QO® and QOB Miniature Circuit Breakers Trip Curves 20 07/2008 © 1998–2008 Schneider Electric All Rights Reserved
QO® and QOB Miniature Circuit Breakers Trip Curves 21 © 1998–2008 Schneider Electric All Rights Reserved 07/2008
QO® and QOB Miniature Circuit Breakers Trip Curves 22 07/2008 © 1998–2008 Schneider Electric All Rights Reserved
QO® and QOB Miniature Circuit Breakers Trip Curves 23 © 1998–2008 Schneider Electric All Rights Reserved 07/2008
QO® and QOB Miniature Circuit Breakers Trip Curves 80 90 100 70 60 50 30 40 20 15 8 9 10 7 6 5 4 3 2 1.5 .6 .8 .9 1 .7 .
QO® and QOB Miniature Circuit Breakers Trip Curves 70 60 80 90 100 50 40 30 15 20 8 9 10 5 7 6 3 4 2 1.5 .7 .6 .8 .9 1 .5 MULTIPLES OF RATED CURRENT 10000 9000 8000 10000 9000 8000 7000 7000 6000 6000 5000 5000 4000 4000 3000 3000 2000 2000 1500 1500 1000 900 800 1000 900 800 700 700 600 600 500 500 QO ® MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO.
QO® and QOB Miniature Circuit Breakers Trip Curves 26 07/2008 © 1998–2008 Schneider Electric All Rights Reserved
QO® and QOB Miniature Circuit Breakers Trip Curves 27 © 1998–2008 Schneider Electric All Rights Reserved 07/2008
QO® and QOB Miniature Circuit Breakers Trip Curves 28 07/2008 © 1998–2008 Schneider Electric All Rights Reserved
QO® and QOB Miniature Circuit Breakers Trip Curves 29 © 1998–2008 Schneider Electric All Rights Reserved 07/2008
QO® and QOB Miniature Circuit Breakers Trip Curves 30 07/2008 © 1998–2008 Schneider Electric All Rights Reserved
QO® and QOB Miniature Circuit Breakers Trip Curves 31 © 1998–2008 Schneider Electric All Rights Reserved 07/2008
QO® and QOB Miniature Circuit Breakers Trip Curves 70 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 .5 MULTIPLES OF RATED CURRENT 10000 9000 8000 10000 9000 8000 7000 7000 6000 6000 5000 5000 4000 4000 3000 3000 2000 2000 1500 1500 1000 900 800 1000 900 800 700 700 600 600 500 500 400 400 300 300 QO ® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO.
QO® and QOB Miniature Circuit Breakers Trip Curves 70 80 90 100 60 50 40 30 20 15 8 9 10 5 6 7 4 3 1.5 2 .6 .8 .9 1 .7 .
QO® and QOB Miniature Circuit Breakers Trip Curves 80 90 100 70 60 50 40 30 20 15 8 9 10 5 7 6 4 3 2 1.5 .8 .9 1 .7 .6 .
QO® and QOB Miniature Circuit Breakers Trip Curves 80 90 100 70 60 40 50 30 15 20 7 6 8 9 10 5 3 4 2 1.5 .7 .8 .9 1 .6 .5 MULTIPLES OF RATED CURRENT 10000 9000 8000 10000 9000 8000 7000 7000 6000 6000 5000 5000 4000 4000 QO ® FAMILY MOLDED CASE CIRCUIT BREAKERS CHARACTERISTIC TRIP CURVE NO.
QO® and QOB Miniature Circuit Breakers Dimensions Dimensions Type QO Plug-On Circuit Breaker 07303114 Figure 10: 3.5 89 2.25 57 3.00 76 0.94 24 3° 0.16 4 21° OFF Re set 22° ON 0.53 13 26° 0.73 19 0.59 15 0.38 10 Tripped 1.48 38 1.34 34 0.53 13 2.23 57 2.09 53 0.25 6 2.92 74 2.91 74 2.31 59 0.75 19 0.75 19 2.75 70 Type QOB Bolt-On Circuit Breaker 07303115 Figure 11: 0.75 19 0.75 19 0.75 19 0.75 19 2.
QO® and QOB Miniature Circuit Breakers Dimensions Figure 12: Type QO-GFI Circuit Breaker 2.91 74 07303116 2.31 59 4.12 103 1.49 38 Pigtail: 18 457 Figure 13: 0.744 19 Type QO-AFI and QO-AFCI Circuit Breakers 2.90 74 073033117 2.31 59 20 4.75 121 Pigtail: 18 457 0.
QO® and QOB Miniature Circuit Breakers Dimensions 07303118 Figure 14: Common Trip 30 Type QO-PL Remote Control Circuit Breaker 2.95 75 2.31 59 20 4.55 116 1.49 38 0.
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