2 Pole Breakers | McMaster-Carr

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	Current Current

1/2A

1 1/2A

	Number of Poles Number of Poles	Show

	Number of Poles Number of Poles	Hide

	Voltage Voltage

	Mounting Location Mounting Location

	Manufacturer Manufacturer

Square D

Siemens

Cutler-Hammer

	Manufacturer Series Manufacturer Series

QOB

Homeline

	Frequency Frequency

50Hz

60Hz

	System of Measurement System of Measurement

Inch

	Width Width

1.39"

1.4"

1 1/2"

	Specifications Met Specifications Met

CE Marked

CSA

IEC

	Wire Connection Type Wire Connection Type

	Screw-Clamp Terminals
	Screw Terminals
	Quick- Disconnect Terminals

	Breakthrough Current Breakthrough Current

	Circuit Breaker Type Circuit Breaker Type

Thermal

Magnetic

	Manual Reset Style Manual Reset Style


Toggle	Push Button

Lever	Rocker

	Reset Type Reset Type

Manual

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

DFARS Specialty Metals
COTS-Exempt

	Minimum Temperature Minimum Temperature

	Maximum Temperature Maximum Temperature

	Depth Depth

2.36"

2.73"

	Height Height

2 1/2"

3.15"

4.13"

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

REACH Compliant

	Mount Type Mount Type

Screw

Snap In

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

RoHS Compliant with
Exemptions

RoHS Compliant

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19 Products

DIN-Rail Mount AC Branch Circuit Breakers

2 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.

2 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/480YV AC	50/60	10,000 A @ 277 V AC 10,000 A @ 480 V AC	35	Screw-Clamp Terminals	4.13"	1.39"	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.

2 Pole

2 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/480YV AC	50/60	10,000 A @ 277 V AC 10,000 A @ 480 V AC	35	Screw-Clamp Terminals	4.13"	1.39"	2.36"	25° to 100°	Time Delay Trip	UL 489, CSA Certified, IEC European Standards	2, 3, 5, 10, 15, 20	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.

2 Pole

2 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/480YV AC	50/60	5,000 A @ 277 V AC 5,000 A @ 480 V AC	35	Screw-Clamp Terminals	3.15"	1.4"	2.36"	-40° to 165°	Time Delay Trip	UL 1077, CSA Certified, CE Marked	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.

2 Pole

2 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/480YV AC	50/60	5,000 A @ 277 V AC 5,000 A @ 480 V AC	35	Screw-Clamp Terminals	3.15"	1.4"	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

Square D Load-Center Circuit Breakers

QO Series, 2 Pole

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

Siemens Load-Center Circuit Breakers

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.

2 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	2"	Time Delay Trip	15, 20, 30, 40, 50, 60	000000	000000
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

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.

2 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 1/2"	Time Delay Trip	15, 20, 30, 40, 50, 60	000000	000000
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	00000

High-Temperature Panel-Mount AC Circuit Breakers

2 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 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
2 Pole—Lever Style
250V AC	50/60	1,500 A @ 250 V AC	-40° to 185°	1.45"	1.52"	2.48"	Screw On	No	Screw Terminals	2.5"	1.5"	15, 20	0000000	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
2	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
2	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

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

2 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.

2-pole circuit breakers require one panel cutout for each pole.

				For Panel Cutout
Voltage	Frequency, Hz	Breakthrough Current	Temp. Range, °F	Dia.	Dp. Behind Panel	Wire Connection Type	Quick-Disconnect Tab Wd.	Ht.	Wd.	Choose a Current, A		Each
2 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"	1.64"	Quick-Disconnect Terminals	0.25"	2"	1.5"	5, 10	0000000	000000