DC Circuit Breakers | McMaster-Carr

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	Voltage Voltage

	Current Current

	Number of Poles Number of Poles

	Manual Reset Style Manual Reset Style


Toggle	Push Button

Lever	Push-Pull Button

Rocker

	Mounting Location Mounting Location

DIN Rail

Panel

Fuse Block

	Frequency Frequency

50Hz

60Hz

	Breakthrough Current Breakthrough Current

	Specifications Met Specifications Met

	Wire Connection Type Wire Connection Type

	Screw-Clamp Terminals
	Screw Terminals
	Quick- Disconnect Terminals

	Circuit Breaker Type Circuit Breaker Type

Thermal

Magnetic

	Reset Type Reset Type

Manual

Automatic

	Number of Mounting Holes Number of Mounting Holes

	Mount Type Mount Type

Screw

Snap In

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Width Width

	Height Height

	Depth Depth

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

DFARS Specialty Metals
COTS-Exempt

	For Panel Cutout Diameter For Panel Cutout Diameter

1/4"

0.49"

0.63"

	Manufacturer Fuse Equivalent Manufacturer Fuse Equivalent

257

ATC

ATO

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

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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27 Products

DIN-Rail Mount AC Branch Circuit Breakers

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.

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

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	0000000
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	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.

2 Pole

3 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"	-40° to 165°	Time Delay Trip	UL 489, CSA Certified, IEC European Standards	2, 3, 5, 10, 15, 20, 30	000000	0000000
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"	-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.

2 Pole

3 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
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	5, 10, 15, 20, 30, 40, 50	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.

2 Pole

3 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
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"	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

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

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.

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

Automatic Reset

Voltage	Breakthrough Current	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, °F	Environmental Rating	Specifications Met	Choose a 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	6, 8, 10, 15, 20, 25, 30	000000	00000

Manual Reset—Push Button Style

Manual Reset

Voltage	Breakthrough Current	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, °F	Environmental Rating	Choose a Current, A		Each
24V DC	2,000 A @ 24 V DC	Fuse Block	1.16"	0.79"	0.25"	-40° to 185°	IP30	6, 8, 10, 15, 20, 25, 30	000000	000000

Vibration-Resistant Blade-Style DC Circuit Breakers

These circuit breakers resist vibration better than standard low-voltage DC circuit breakers. They protect against overload and short circuits in low-voltage automotive and other electronic applications. Use them to replace type ATC, AT, 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.

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

Push Button Style
Voltage	Breakthrough Current	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, °F	Environmental Rating	Specifications Met	Choose a Current, A		Each
48V DC	2,000 A @ 48 V DC	Fuse Block	1.5"	0.87"	0.25"	-40° to 185°	IP40	SAE J553	3, 4, 5, 6, 7 1/2, 8, 10, 15, 20, 25	000000	000000

Blade-Style High-Voltage DC Circuit Breakers

Rated to 72V DC, these can handle higher voltages than any other DC circuit breaker we offer. Use these circuit breakers in place of type ATC, AF, ATO, and 257 blade-style fuses to protect against overload and short circuits in low-voltage automotive and 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.

DIN-rail mount holder is required (sold separately) to mount circuit breakers to DIN-rail.

Push Button Style

Voltage	Breakthrough Current	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, °F	Specifications Met	Choose a Current, A		Each
72V DC	2,000 A @ 72 V DC	Fuse Block	2.06"	0.96"	0.25"	0° to 140°	CSA Certified, UL Recognized Component, UL 1077	1/4, 1/2, 1, 1 1/2, 2, 2 1/2, 3, 4, 5, 6, 8, 10	000000	000000

DIN-Rail Mount Holders

For DIN Rail Size, mm	Wire Connection Type		Each
35	Screw-Clamp Terminals	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
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	00000

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
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	00000

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

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 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
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"	2"	Quick-Disconnect Terminals	0.25"	2"	1.5"	5, 10	0000000	00000