Mounting Location Mounting Location |
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Wire Connection Type Wire Connection Type |
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| Screw-Clamp Terminals | Snap On |
Breakthrough Current Breakthrough Current |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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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
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 | 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 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 | |