30A Breakers | McMaster-Carr

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30A

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	Number of Poles Number of Poles

	Voltage Voltage

	Mounting Location Mounting Location

	Frequency Frequency

50Hz

60Hz

	Circuit Breaker Type Circuit Breaker Type

Thermal

Magnetic

	Manufacturer Manufacturer

Square D

Siemens

Cutler-Hammer

	Specifications Met Specifications Met

CE Marked

CSA

SAE

	Manual Reset Style Manual Reset Style


Toggle	Push Button

Lever	Push-Pull Button

	Wire Connection Type Wire Connection Type

	Screw-Clamp Terminals
	Screw Terminals
	Quick- Disconnect Terminals

	Breakthrough Current Breakthrough Current

	System of Measurement System of Measurement

Inch

	Width Width

	Depth Depth

1.44"

1.72"

2.36"

	Manufacturer Series Manufacturer Series

QOB

Homeline

	Reset Type Reset Type

Manual

Automatic

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

-25° F or less

-24° to 0° F

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

DFARS Specialty Metals
COTS-Exempt

	Height Height

	Number of Mounting Holes Number of Mounting Holes

	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 with
Exemptions

RoHS Compliant

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30 Products

About Extension Cords

About Industry Designation for Cable Insulation

1 Pole Circuit Breaker

2 Pole Circuit Breaker

3 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.

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	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	30	000000	000000
2 Pole—Toggle Style
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	30	000000	00000
3 Pole—Toggle Style
277V AC/480YV AC	50/60	10,000 A @ 277 V AC 10,000 A @ 480 V AC	35	Screw-Clamp Terminals	4.13"	2.09"	2.36"	-4° to 140°	Time Delay Trip	UL 489, CSA Certified	30	000000	00000

Alarms

Alarm

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.

1 Pole

2 Pole

3 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	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	30	000000	000000
2 Pole—Toggle Style
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	30	000000	00000
3 Pole—Toggle Style
277V AC/480YV AC	50/60	5,000 A @ 277 V AC 5,000 A @ 480 V AC	35	Screw-Clamp Terminals	3.15"	2.1"	2.36"	-40° to 165°	Time Delay Trip	UL 1077, CSA Certified, CE Marked	30	000000	00000

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, 1 Pole

QO Series, 2 Pole

QOB Series, 1 Pole

QOB Series, 2 Pole

QOB Series, 3 Pole

Homeline Series, 1 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	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	Screw-Clamp Terminals	3/4"	Time Delay Trip	UL 489	30	0000000	000000
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	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 489	30	000000	00000
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	30	000000	00000
3 Pole—Toggle Style
240V AC	60	10,000 A @ 240 V AC	Panel Board	Screw-Clamp Terminals	2 1/4"	Time Delay Trip	UL 489	30	000000	000000
Homeline Series
1 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"	Time Delay Trip	UL 489	30	0000000	0000
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	30	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	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	30	000000	00000
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	30	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	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	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	30	000000	00000

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 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.	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"	30	0000000	000000

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.

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	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	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	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	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	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	000000	000000

Blade-Style DC Circuit Breakers

Protect against overload and short circuits in low-voltage automotive and other electronic applications. These circuit breakers can replace type ATC, AF, ATO, and 257 blade-style fuses. 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.

Automatic Reset

Voltage	Breakthrough Current	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, °F	Environmental Rating	Specifications Met	Current, A		Each
12V DC	2,000 A @ 12 V DC	Fuse Block	0.95"	0.79"	0.25"	-40° to 185°	IP54	SAE J553	30	000000	00000

Manual Reset—Push Button Style

Manual Reset

Voltage	Breakthrough Current	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, °F	Environmental Rating	Current, A		Each
24V DC	2,000 A @ 24 V DC	Fuse Block	1.16"	0.79"	0.25"	-40° to 185°	IP30	30	000000	000000

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 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.	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"	30	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"	1.64"	Quick-Disconnect Terminals	0.25"	2"	0.75"	30	00000000	00000

GFCI Turn-Lock Extension Cords

Keep personnel safe from electric shock with these cords. Give the connectors a quarter turn to lock in place; they remain secure in high-vibration applications. All have a manual GFCI reset that prevents unexpected equipment start-up. The industry designation is SJTW, so the insulation resists water.

NEMA L5-30 Plug

NEMA L5-30 Socket

NEMA L6-30 Plug

NEMA L6-30 Socket

NEMA L5-30 Plug × NEMA L5-30 Socket
Lg., ft.	Wire Gauge	Current, A	Voltage	GFCI Location	Reset Type	Power-Indicating Light	Cord Insulation Material	Industry Designation	Specifications Met	Color		Each
2	10	30	125V AC	Inline	Manual	Without Power-Indicating Light	PVC Plastic	SJTW	UL Listed, CSA Certified	Yellow	0000000	0000000
NEMA L6-30 Plug × NEMA L6-30 Socket
3	10	30	250V AC	Inline	Manual	Without Power-Indicating Light	PVC Plastic	SJTW	UL Listed, CSA Certified	Yellow	0000000	000000
6	10	30	250V AC	Inline	Manual	Without Power-Indicating Light	PVC Plastic	SJTW	UL Listed, CSA Certified	Yellow	0000000	000000
25	10	30	250V AC	Inline	Manual	Without Power-Indicating Light	PVC Plastic	SJTW	UL Listed, CSA Certified	Yellow	0000000	000000

About Extension Cords

About Industry Designation for Cable Insulation

DIN-Rail Mount AC Branch Circuit Breakers

DIN-Rail Mount AC Equipment Circuit Breakers

Square D Load-Center Circuit Breakers

Siemens Load-Center Circuit Breakers

Cutler-Hammer Load-Center Circuit Breakers

High-Temperature Panel-Mount AC Circuit Breakers

Harsh-Environment DC Circuit Breakers

Blade-Style DC Circuit Breakers

High-Temperature Panel-Mount AC/DC Circuit Breakers

GFCI Turn-Lock Extension Cords