100A Breakers | McMaster-Carr

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100A

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	Voltage Voltage

	Number of Mounting Holes Number of Mounting Holes

	Manual Reset Style Manual Reset Style


Push Button	Lever

	Number of Poles Number of Poles

	Breakthrough Current Breakthrough Current

	Wire Connection Type Wire Connection Type

Screw Terminals

Bus Bar

	Number of Spaces Number of Spaces

	System of Measurement System of Measurement

Inch

	Depth Depth

	Height Height

	Mounting Style Mounting Style

Surface

Recessed

	Mounting Hole Diameter Mounting Hole Diameter

0.19"

1/4"

	Mount Type Mount Type

Screw

	Width Width

	Circuit Breaker Type Circuit Breaker Type

Thermal

	Circuit Breaker Box Type Circuit Breaker Box Type

Secondary

Main

	Manufacturer Series Manufacturer Series

Homeline

	Reset Type Reset Type

Manual

	Environmental Rating Environmental Rating

NEMA 1

NEMA 3R

	Specifications Met Specifications Met

CE Marked

	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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15 Products

Square D Secondary Circuit Breaker Boxes

Connect these boxes to a main box—they do not have a main circuit breaker switch. They are single-phase, 3-wire, and can be mounted for top or bottom feed conduit connections. Use with Square D QO circuit breakers. Also known as load centers.

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

NEMA 3R rated boxes are for outdoor use.

							Cover
Number of Spaces	Current, A	Voltage	Frequency, Hz	Breakthrough Current	Mounting Style	Bus Bar Material	Attachment Style	Closure Method	Ht.	Wd.	Dp.		Each
NEMA 3R Rated Boxes
6	100	120V AC/240V AC	60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Surface	Tin-Plated Copper	Hinged	Latch	12 5/8"	8 7/8"	4 1/4"	0000000	0000000

Square D Main Circuit Breaker Boxes

These boxes have a main circuit breaker switch and main service knockouts in the corners. They are single-phase, 3-wire, and can be mounted for top or bottom feed conduit connections. Use with Square D QO circuit breakers. Boxes are rated NEMA 1 for indoor use. Also known as load centers.

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

							Cover
Number of Spaces	Current, A	Voltage	Frequency, Hz	Breakthrough Current	Mounting Style	Bus Bar Material	Attachment Style	Closure Method	Ht.	Wd.	Dp.		Each
NEMA 1 Rated Boxes
12	100	120V AC/240V AC	60	22,000 A @ 120 V AC 22,000 A @ 240 V AC	Recessed/Surface	Tin-Plated Copper	Lift Off	Screws	14 7/8"	14 1/4"	3 3/4"	0000000	0000000
20	100	120V AC/240V AC	60	22,000 A @ 120 V AC 22,000 A @ 240 V AC	Recessed/Surface	Tin-Plated Copper	Lift Off	Screws	17 7/8"	14 1/4"	3 3/4"	0000000	000000

Square D Homeline Circuit Breaker Boxes

Use these boxes with Homeline series circuit breakers and connect them to a main box—they do not have a main circuit breaker switch. They are single-phase, 3-wire, and can be mounted for top or bottom feed conduit connections. Boxes are rated NEMA 1 for indoor use. Also known as load centers.

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.

							Cover
Number of Spaces	Current, A	Voltage	Frequency, Hz	Breakthrough Current	Mounting Style	Bus Bar Material	Attachment Style	Closure Method	Ht.	Wd.	Dp.		Each
NEMA 1 Rated Boxes
6	100	120V AC/240V AC	50/60	10,000 A @ 120 V AC 10,000 A @ 240 V AC	Surface	Tin-Plated Aluminum	Lift Off	Screws	12 5/8"	8 7/8"	3 7/8"	0000000	000000

Square D Load-Center Circuit Breakers

Homeline Series
Number of Poles	Wd.	Current, A		Each
1	1"	15	00000000	000000
1	1"	20	00000000	00000
1	1"	20	00000000	00000
1	1"	30	00000000	00000
1	1"	40	00000000	00000
2	2"	15	00000000	00000
2	2"	20	00000000	00000
2	2"	30	00000000	00000
2	2"	40	00000000	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.

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	100	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	100	000000	000000