Breaker Box Breakers | McMaster-Carr

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	Current Current

	Voltage Voltage

120V AC

240V AC

	Number of Poles Number of Poles

	Manufacturer Manufacturer

Square D

Siemens

Cutler-Hammer

	Manufacturer Series Manufacturer Series

Homeline

	Mounting Location Mounting Location	Show

Breaker Box

	Mounting Location Mounting Location	Hide

	Wire Connection Type Wire Connection Type


Screw-Clamp Terminals	Snap On

	System of Measurement System of Measurement

Inch

	Width Width

3/4"

1 1/2"

	Breakthrough Current Breakthrough Current

10,000 A @ 120 V AC

10,000 A @ 240 V AC

	Reset Type Reset Type

Manual

	Circuit Breaker Type Circuit Breaker Type

Thermal

Magnetic

	Manual Reset Style Manual Reset Style

	Toggle

	Frequency Frequency

60Hz

	Specifications Met Specifications Met

UL 489

UL Listed

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

DFARS Specialty Metals
COTS-Exempt

	UL File Number UL File Number

E84967

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

REACH Compliant

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

RoHS Compliant

RoHS Compliant with
Exemptions

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14 Products

Square D Load-Center Circuit Breakers

QO Series, 1 Pole

QO Series, 2 Pole

Homeline Series, 1 Pole

Homeline
Series, 1
Tandem Pole

Homeline Series, 2 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
2 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	1 1/2"	Time Delay Trip	UL Listed, UL 489	15, 20, 30, 40, 50, 60	0000000	00000
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	1 1/2"	Time Delay Trip	UL Listed, UL 489	70	0000000	000000
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
2 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Breaker Box	Snap On	2"	Time Delay Trip	UL Listed, UL 489	15, 20, 30, 40	0000000	00000

Siemens Load-Center Circuit Breakers

1 Pole

2 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
2 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Screw-Clamp Terminals	2"	Time Delay Trip	15, 20, 30, 40, 50, 60	000000	00000
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Screw-Clamp Terminals	2"	Time Delay Trip	70	000000	00000

Cutler-Hammer Load-Center Circuit Breakers

1 Pole

2 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
2 Pole—Toggle Style
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Screw-Clamp Terminals	1 1/2"	Time Delay Trip	15, 20, 30, 40, 50, 60	000000	00000
120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Screw-Clamp Terminals	1 1/2"	Time Delay Trip	70	000000	000000