Circuit Breaker Type Circuit Breaker Type | Show |
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Current Current |
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Mounting Location Mounting Location |
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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 |
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Rocker |
Wire Connection Type Wire Connection Type |
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Screw-Clamp Terminals | Snap On |
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Screw Terminals | Quick- Disconnect Terminals |
Breakthrough Current Breakthrough Current |
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Manufacturer Manufacturer |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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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







Series, 1
Tandem 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.
Voltage | Frequency, Hz | Breakthrough Current | Mounting Location | Wire Connection Type | Wd. | Features | Specifications Met | Choose a Current, A | Each | |
QO Series | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
1 Pole—Toggle Style | ||||||||||
120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 3/4" | Time Delay Trip | UL Listed, UL 489 | 0000000 | 000000 | |
120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 3/4" | Time Delay Trip | UL Listed, UL 489 | 30 | 0000000 | 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 | 1 1/2" | Time Delay Trip | UL Listed, UL 489 | 0000000 | 00000 | |
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 | 70 | 0000000 | 000000 |
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 Listed, UL 489 | 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 Listed, UL 489 | 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 Listed, UL 489 | 000000 | 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 |
120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 1" | Tandem Circuit, Time Delay Trip | UL Listed, UL 489 | 20 | 00000000 | 00000 |
120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 1" | Time Delay Trip | UL Listed, UL 489 | 0000000 | 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 | 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 | Choose a Current, A | Each | |
1 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" | Time Delay Trip | 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 | 2" | Time Delay Trip | 000000 | 00000 | |
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


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 | Choose a Current, A | Each | |
1 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 | 3/4" | Time Delay Trip | 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 | 000000 | 00000 | |
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 | 000000 |
DIN-Rail Mount AC Branch Circuit Breakers



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.
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 | |
1 Pole—Toggle Style | |||||||||||||
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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 | 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 | 000000 | 000000 | |
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 | 000000 | 000000 |

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.



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 | |
1 Pole—Toggle Style | |||||||||||||
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277V AC | 50/60 | 10,000 A @ 277 V AC | 35 | Screw-Clamp Terminals | 4.13" | 0.7" | 2.36" | -40° to 165° | Time Delay Trip | UL 489, CSA Certified, IEC European Standards | 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" | -40° to 165° | Time Delay Trip | UL 489, CSA Certified, IEC European Standards | 000000 | 000000 | |
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 | 000000 | 000000 |
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.



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 | |
1 Pole—Toggle Style | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | 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 | 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 | 000000 | 000000 |
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 | Choose a 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 | 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 | 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 | 000000 | 000000 |
Current | Includes | Each | |
0.5 A @ 110 V DC, 2 A @ 250 V AC | Two Sets of Auxillary Contacts | 0000000 | 000000 |
Space-Saver Panel-Mount AC Branch Circuit Breakers

Small enough to fit in tight spaces, these UL 489-rated circuit breakers provide branch circuit protection. They 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.
Current, A | Voltage | Frequency, Hz | Breakthrough Current | For Panel Cutout Dia. | Dp. Behind Panel | Mount Type | Quick-Disconnect Tab Wd. | Temp. Range, °F | Specifications Met | Each | |
1 Pole—Push Button Style | |||||||||||
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15 | 120V AC | 50/60 | 5,000 A @ 120 V AC | 0.38" | 1.43" | Screw On | 0.25" | 35° to 140° | UL 489, UL Listed, CSA Certified | 0000000 | 000000 |
20 | 120V AC | 50/60 | 5,000 A @ 120 V AC | 0.38" | 1.43" | Screw On | 0.25" | 35° to 140° | UL 489, UL Listed, CSA Certified | 0000000 | 00000 |
Plug-Base Circuit Breakers

Replace any Edison-base fuse with these resettable circuit breakers.
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.
Current, A | Voltage | Manufacturer Fuse Equivalent | Circuit Breaker Type | Breakthrough Current | Mounting Location | Specifications Met | Each | |
Push Button Style | ||||||||
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10 | 120V AC | T, TL, W | Thermal | 5,000 A @ 120 V AC | Fuse Panel | UL Listed | 000000 | 000000 |
15 | 120V AC | T, TL, W | Thermal | 5,000 A @ 120 V AC | Fuse Panel | UL Listed | 000000 | 00000 |
20 | 120V AC | T, TL, W | Thermal | 5,000 A @ 120 V AC | Fuse Panel | UL Listed | 000000 | 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.

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 | 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 | 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 | 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 | 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 | 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.
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.
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.
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.

For Panel Cutout | |||||||||||||
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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 | 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 | 000000 | 00000 |

For Panel Cutout | ||||||||||||
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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 | 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 | 000000 | 00000 |
