1 Pole Breakers | McMaster-Carr

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	Current Current

	Number of Poles Number of Poles	Show

	Number of Poles Number of Poles	Hide

	Voltage Voltage

	Mounting Location Mounting Location

	Wire Connection Type Wire Connection Type


Screw-Clamp Terminals	Snap On

Screw Terminals	Quick- Disconnect Terminals

	Manual Reset Style Manual Reset Style


Toggle	Push Button

Lever	Push-Pull Button

Rocker

	Frequency Frequency

50Hz

60Hz

	Specifications Met Specifications Met

CE Marked

CSA

IEC

	Manufacturer Series Manufacturer Series

QOB

Homeline

	Manufacturer Manufacturer

Square D

Siemens

Cutler-Hammer

	Circuit Breaker Type Circuit Breaker Type

Thermal

Magnetic

	Breakthrough Current Breakthrough Current

	System of Measurement System of Measurement

Inch

	Width Width

	Height Height

	Depth Depth

	Reset Type Reset Type

Manual

	Number of Mounting Holes Number of Mounting Holes

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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26 Products

Square D Load-Center Circuit Breakers

QO Series, 1 Pole

QOB Series, 1 Pole

Homeline Series, 1 Pole

Homeline
Series, 1
Tandem Pole

Match these circuit breakers to Square D breaker boxes or panel boards of the same manufacturer series. They meet UL 489 requirements for branch circuit protection. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

For technical drawings and 3-D models, click on a part number.

QO Series
Voltage	Frequency, Hz	Breakthrough Current	Mounting Location	Wire Connection Type	Wd.	Features	Specifications Met	Choose a Current, A		Each
1 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	3/4"	Time Delay Trip	UL Listed, UL 489	15, 20	0000000	000000
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	3/4"	Time Delay Trip	UL Listed, UL 489	30	0000000	00000
QOB Series
1 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Panel Board	Screw-Clamp Terminals	3/4"	Time Delay Trip	UL Listed, UL 489	15, 20, 30	000000	00000
Homeline Series
1 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC	Breaker Box	Snap On	1"	Time Delay Trip	UL Listed, UL 489	40	00000000	00000
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	1"	Tandem Circuit, Time Delay Trip	UL Listed, UL 489	20	00000000	00000
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	1"	Time Delay Trip	UL Listed, UL 489	15, 20, 30	0000000	00000

Siemens Load-Center Circuit Breakers

1 Pole

Use with Siemens EQ series breaker boxes. These circuit breakers meet UL 489 requirements for branch circuit protection. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

1 Pole—Toggle Style
Voltage	Frequency, Hz	Breakthrough Current	Wire Connection Type	Wd.	Features	Choose a Current, A		Each
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Screw-Clamp Terminals	1"	Time Delay Trip	15, 20, 30	000000	000000

Cutler-Hammer Load-Center Circuit Breakers

1 Pole

Install these circuit breakers into Cutler-Hammer CH series breaker boxes. They meet UL 489 requirements for branch circuit protection. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

1 Pole—Toggle Style
Voltage	Frequency, Hz	Breakthrough Current	Wire Connection Type	Wd.	Features	Choose a Current, A		Each
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Screw-Clamp Terminals	3/4"	Time Delay Trip	15, 20, 30	000000	000000

DIN-Rail Mount AC Branch Circuit Breakers

1 Pole Circuit Breaker

Use these circuit breakers upstream from small transformers, lighting, and control circuits. They meet UL 489 requirements for branch circuit protection. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit. Mount directly to DIN rail.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

Alarm (sold separately) sends an audible signal when the breaker is tripped.

For technical drawings and 3-D models, click on a part number.

1 Pole—Toggle Style
Voltage	Frequency, Hz	Breakthrough Current	For DIN Rail Size, mm	Wire Connection Type	Ht.	Wd.	Dp.	Temp. Range, °F	Features	Specifications Met	Choose a Current, A		Each
277V AC	50/60	10,000 A @ 277 V AC	35	Screw-Clamp Terminals	4.13"	0.7"	2.36"	-4° to 140°	Time Delay Trip	UL 489, CSA Certified	1/2, 1, 1 1/2, 2, 3, 4, 5, 6, 7, 8, 10, 13, 15, 16, 20, 25, 30, 32	000000	000000

Alarms

Alarm

Current	Includes		Each
0.5 A @ 110 V DC, 2 A @ 250 V AC	Two Sets of Auxillary Contacts	0000000	000000

High-Inrush DIN-Rail Mount AC Branch Circuit Breakers

Able to handle high inrush current caused by equipment startup, use these circuit breakers upstream from motors and larger transformer applications. They meet UL 489 requirements for branch circuit protection. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit. Mount directly to DIN rail.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

Alarm (sold separately) sends an audible signal when the breaker is tripped.

For technical drawings and 3-D models, click on a part number.

1 Pole

1 Pole—Toggle Style
Voltage	Frequency, Hz	Breakthrough Current	For DIN Rail Size, mm	Wire Connection Type	Ht.	Wd.	Dp.	Temp. Range, °F	Features	Specifications Met	Choose a Current, A		Each
277V AC	50/60	10,000 A @ 277 V AC	35	Screw-Clamp Terminals	4.13"	0.7"	2.36"	-40° to 165°	Time Delay Trip	UL 489, CSA Certified, IEC European Standards	2, 3, 5, 10, 15, 20, 30	000000	000000

Alarms

Current	Includes		Each
0.5 A @ 110 V DC, 2 A @ 250 V AC	Two Sets of Auxillary Contacts	0000000	000000

DIN-Rail Mount AC Equipment Circuit Breakers

These circuit breakers meet UL 1077 requirements for supplemental circuit protection and are designed for use downstream of a branch circuit breaker. Use them with small transformers, lighting, and control circuits. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit. Mount directly to DIN rail.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

Alarm (sold separately) sends an audible signal when the breaker is tripped.

For technical drawings and 3-D models, click on a part number.

1 Pole

1 Pole—Toggle Style
Voltage	Frequency, Hz	Breakthrough Current	For DIN Rail Size, mm	Wire Connection Type	Ht.	Wd.	Dp.	Temp. Range, °F	Features	Specifications Met	Choose a Current, A		Each
277V AC	50/60	5,000 A @ 277 V AC	35	Screw-Clamp Terminals	3.15"	0.7"	2.36"	-40° to 165°	Time Delay Trip	UL 1077, CSA Certified, CE Marked	1, 2, 3, 4, 5, 10, 15, 20, 30	000000	000000

Alarms

Current	Includes		Each
0.5 A @ 110 V DC, 2 A @ 250 V AC	Two Sets of Auxillary Contacts	0000000	000000

High-Inrush DIN-Rail Mount AC Equipment Circuit Breakers

Able to handle high inrush currents caused by equipment startup, these circuit breakers are suitable for motor and larger transformer applications. They meet UL 1077 requirements for supplemental circuit protection and are designed for use downstream of a branch circuit breaker. All are thermal/magnetic—breakers trip when heat is generated by sustained, low-level overload current, but will trip quickly when the magnetic field in the coil senses a high-current short circuit. Mount directly to DIN rail.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

Alarm (sold separately) sends an audible signal when the breaker is tripped.

For technical drawings and 3-D models, click on a part number.

1 Pole

1 Pole—Toggle Style
Voltage	Frequency, Hz	Breakthrough Current	For DIN Rail Size, mm	Wire Connection Type	Ht.	Wd.	Dp.	Temp. Range, °F	Features	Specifications Met	Choose a Current, A		Each
277V AC	50/60	5,000 A @ 277 V AC	35	Screw-Clamp Terminals	3.15"	0.7"	2.36"	25° to 100°	Time Delay Trip	UL 1077, CSA Certified, CE Marked, IEC European Standards	2, 3, 5, 10, 15, 20, 40	000000	000000

Alarms

Current	Includes		Each
0.5 A @ 110 V DC, 2 A @ 250 V AC	Two Sets of Auxillary Contacts	0000000	000000

High-Temperature Panel-Mount AC Circuit Breakers

1 Pole

These magnetic circuit breakers are unaffected by temperature changes and trip when the magnetic field in the coil increases from current overload, so they are suitable for high-temperature environments.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

For technical drawings and 3-D models, click on a part number.

				For Panel Cutout
Voltage	Frequency, Hz	Breakthrough Current	Temp. Range, °F	Ht.	Wd.	Dp. Behind Panel	Mount Type	Mounting Fasteners Included	Wire Connection Type	Ht.	Wd.	Choose a Current, A		Each
1 Pole—Lever Style
250V AC	50/60	1,500 A @ 250 V AC	-40° to 185°	1.45"	0.76"	2.48"	Screw On	No	Screw Terminals	2.5"	0.75"	10, 15, 20, 30, 50	0000000	000000

Space-Saver Panel-Mount AC Branch Circuit Breakers

Small enough to fit in tight spaces, these UL 489-rated circuit breakers provide branch circuit protection. They are thermal, so they use the heat generated in overcurrent situations to trip the breaker.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

For technical drawings and 3-D models, click on a part number.

1 Pole—Push Button Style
Current, A	Voltage	Frequency, Hz	Breakthrough Current	For Panel Cutout Dia.	Dp. Behind Panel	Mount Type	Quick-Disconnect Tab Wd.	Temp. Range, °F	Specifications Met		Each
15	120V AC	50/60	5,000 A @ 120 V AC	0.38"	1.43"	Screw On	0.25"	35° to 140°	UL 489, UL Listed, CSA Certified	0000000	000000
20	120V AC	50/60	5,000 A @ 120 V AC	0.38"	1.43"	Screw On	0.25"	35° to 140°	UL 489, UL Listed, CSA Certified	0000000	00000

Harsh-Environment DC Circuit Breakers

Built to resist vibration and corrosion in harsh environments. These circuit breakers protect against overload and short circuits in low-voltage automotive and other electronic applications. All are thermal, so they use the heat generated in overcurrent situations to trip the breaker.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

Push-pull button and lever style breakers can be used as an on/off switch.

For technical drawings and 3-D models, click on a part number.

Push-Pull Button Style

Number of Poles	Voltage	Breakthrough Current	For Panel Cutout Dia.	Dp. Behind Panel	Mount Type	Mounting Fasteners Included	Wire Connection Type	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
1	28V DC	6,000 A @ 28 V DC	0.49"	2.48"	Screw On	Yes	Screw Terminals	-65° to 165°	UL Recognized Component	30, 35, 40, 45, 50, 55, 60, 70, 80, 90	000000	000000

Lever Style

							Mounting Holes
Number of Poles	Voltage	Breakthrough Current	Ht.	Wd.	Dp.	Mount Type	No. of	Dia.	Mounting Fasteners Included	Wire Connection Type	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
1	48V DC	5,000 A @ 48 V DC	3.44"	2.32"	1.72"	Screw On	3	0.19"	No	Screw Terminals	-40° to 185°	CE Marked	30, 40, 50, 60, 70, 80, 100, 120, 135, 150	000000	000000

Push Button Style

							Mounting Holes
Number of Poles	Voltage	Breakthrough Current	Ht.	Wd.	Dp.	Mount Type	No. of	Dia.	Mounting Fasteners Included	Wire Connection Type	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
1	42V DC	3,000 A @ 42 V DC	2.89"	1.9"	1.44"	Screw On	2	0.25"	No	Screw Terminals	-25° to 180°	CE Marked	30, 40, 50, 60, 70, 80, 90, 100, 120, 135, 150	000000	000000

Panel-Mount AC/DC Circuit Breakers

In addition to protecting equipment, these circuit breakers can be used as on/off switches. Able to handle high inrush current found in motor start-ups. They meet UL 1077 requirements for supplemental circuit protection and are designed for use downstream of a branch circuit breaker. All are thermal, so they use the heat generated in overcurrent situations to trip the breaker.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

Covers for rocker style breakers (sold separately) provide IP54 protection against limited dust and splashed water.

Covers for push-button style breakers (sold separately) provide IP65 protection against water projected from a nozzle.

For technical drawings and 3-D models, click on a part number.

Push Button Style—Screw-On Mount

Push Button Style

				For Panel Cutout
No. of Poles	Voltage	Frequency, Hz	Breakthrough Current	Ht.	Wd.	Dp. Behind Panel	Mounting Fasteners Included	Quick-Disconnect Tab Wd.	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
1	240V AC/60V DC	50/60	1,000 A @ 60 V DC 1,000 A @ 240 V AC	1.98"	0.99"	1.96"	No	0.25"	15° to 130°	UL 1077, UL Recognized Component, CSA Certified	5, 10, 15, 20	000000	000000

Rocker Style—Snap-In Mount

Rocker Style

				For Panel Cutout
No. of Poles	Voltage	Frequency, Hz	Breakthrough Current	Ht.	Wd.	Dp. Behind Panel	Quick-Disconnect Tab Wd.	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
1	240V AC/60V DC	50/60	1,000 A @ 60 V DC 1,000 A @ 240 V AC	1.77"	0.85"	1.75"	0.25"	15° to 130°	UL 1077, UL Recognized Component, CSA Certified	5, 10, 15, 20	000000	000000

Toggle Style—Screw-On Mount

Toggle Style

No. of Poles	Voltage	Frequency, Hz	For Panel Cutout Dia.	Dp. Behind Panel	Quick-Disconnect Tab Wd.	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
1	250V AC/75V DC	50/60	1/4"	2.42"	0.25"	-20° to 140°	UL Recognized Component	1/20, 2/10, 4/10, 1/2, 6/10, 8/10, 1, 1 1/2, 2, 2 1/2, 3, 4, 5, 6, 8, 10	000000	000000

Covers

For Circuit Breaker Style	Environmental Rating	Material	Color		Each
Push Button	IP65	Plastic	Clear	000000	00000
Rocker	IP54	Plastic	Clear	000000	0000

High-Temperature Panel-Mount AC/DC Circuit Breakers

1 Pole

These magnetic circuit breakers are unaffected by temperature changes so they are suitable for high-temperature environments. They trip when the magnetic field in the coil increases from current overload.

Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

For technical drawings and 3-D models, click on a part number.

				For Panel Cutout
Voltage	Frequency, Hz	Breakthrough Current	Temp. Range, °F	Ht.	Wd.	Dia.	Dp. Behind Panel	Wire Connection Type	Quick-Disconnect Tab Wd.	Ht.	Wd.	Choose a Current, A		Each
1 Pole—Lever Style
250V AC/80V DC	50/60	1,500 A @ 250 V AC 5,000 A @ 80 V DC	-40° to 185°	1.45"	0.76"	__	2.48"	Screw Terminals	__	2.5"	0.75"	15, 20, 30, 40, 50	0000000	000000
1 Pole—Toggle Style
277V AC/80V DC	50/60	5,000 A @ 277 V AC 7,500 A @ 80 V DC	-40° to 185°	__	__	0.63"	2"	Quick-Disconnect Terminals	0.25"	2"	0.75"	5, 10, 15, 20, 30	00000000	00000