Current Current | Show |
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Current Current | Hide |
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Mounting Location Mounting Location |
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Wire Connection Type Wire Connection Type |
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Screw-Clamp Terminals | Snap On |
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Screw Terminals |
Manufacturer Manufacturer |
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Manual Reset Style Manual Reset Style |
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Toggle | Push Button |
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Lever | Push-Pull Button |
Breakthrough Current Breakthrough Current |
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System of Measurement System of Measurement |
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Reset Type Reset Type |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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For Panel Cutout Diameter For Panel Cutout Diameter |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Square D Load-Center Circuit Breakers



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.
Voltage | Frequency, Hz | Breakthrough Current | Mounting Location | Wire Connection Type | Wd. | Features | Specifications Met | Current, A | Each | |
QO Series | ||||||||||
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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 | 40 | 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 |
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 | 40 | 0000000 | 00000 |
Siemens Load-Center Circuit Breakers

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.
Voltage | Frequency, Hz | Breakthrough Current | Wire Connection Type | Wd. | Features | Current, A | Each | |
2 Pole—Toggle Style | ||||||||
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120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Screw-Clamp Terminals | 2" | Time Delay Trip | 40 | 000000 | 000000 |
Cutler-Hammer Load-Center Circuit Breakers

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.
Voltage | Frequency, Hz | Breakthrough Current | Wire Connection Type | Wd. | Features | Current, A | Each | |
2 Pole—Toggle Style | ||||||||
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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 | 40 | 000000 | 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.

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 | |
3 Pole—Toggle Style | |||||||||||||
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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 | 40 | 000000 | 0000000 |
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.



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 | |
1 Pole—Toggle Style | |||||||||||||
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277V AC | 50/60 | 5,000 A @ 277 V AC | 35 | Screw-Clamp Terminals | 3.15" | 0.7" | 2.36" | 25° to 100° | Time Delay Trip | UL 1077, CSA Certified, CE Marked, IEC European Standards | 40 | 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" | 25° to 100° | Time Delay Trip | UL 1077, CSA Certified, CE Marked, IEC European Standards | 40 | 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" | 25° to 100° | Time Delay Trip | UL 1077, CSA Certified, CE Marked, IEC European Standards | 40 | 000000 | 000000 |
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.

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 | 40 | 000000 | 000000 |

Mounting Holes | |||||||||||||||
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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 | 40 | 000000 | 000000 |

Mounting Holes | |||||||||||||||
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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 | 40 | 000000 | 000000 |
High-Temperature Panel-Mount AC/DC Circuit Breakers

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 technical drawings and 3-D models, click on a part number.
For Panel Cutout | ||||||||||||
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Voltage | Frequency, Hz | Breakthrough Current | Temp. Range, °F | Ht. | Wd. | Dp. Behind Panel | Wire Connection Type | 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" | 40 | 0000000 | 000000 |