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Square D QOB3100-1042 QOB31001042 - 100A 3 Pole Miniature Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Square D
QOB3100-1042
QOB31001042 - 100A 3 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB3100-1042
Quantity
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Square D QOB31001042 - 100A 3 Pole Miniature Circuit Breaker
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Description
Integrating a factory-installed 1A/1B auxiliary switch, this 100A, 3-pole miniature circuit breaker enables advanced status monitoring for control systems. It delivers 10kAIC of thermal-magnetic protection for 240VAC commercial applications. The unit fastens securely into Square D NQ and NQOD panelboards using a standard bolt-on connection. Its box lug terminals are rated for 4 AWG to 2/0 AWG copper or aluminum wiring.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB3100-1042 |
| Series | QOB |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 4 AWG - 2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Auxiliary Switch |
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
Product FAQs
8 answersWhat does the "-1042" suffix mean on the QOB31001042 catalog number?
The "-1042" suffix indicates that this breaker includes a factory-installed shunt trip accessory rated for 12V or 24V AC/DC. This allows the breaker to be tripped remotely using a separate control circuit.
Which panelboards are compatible with the QOB31001042 circuit breaker?
This bolt-on miniature circuit breaker is designed exclusively for use in Square D NQ and NQOD series panelboards. It cannot be installed in standard QO load centers, which require plug-on connections.
How many panel spaces does the QOB31001042 require?
While the breaker itself is a 3-pole device, the factory-installed shunt trip accessory requires one additional pole space. Therefore, this unit will occupy a total of four pole spaces in your NQ or NQOD panelboard.
Can I add a shunt trip to a standard QOB3100 breaker in the field?
No. Square D QO and QOB miniature circuit breakers do not support field-installable internal accessories. The shunt trip must be factory-installed, which requires ordering the specific QOB31001042 catalog number.
What is the difference between the QO31001042 and the QOB31001042?
The QO31001042 is a plug-on circuit breaker designed for QO load centers, while the QOB31001042 features a bolt-on connection specifically designed for NQ and NQOD commercial panelboards. Both models include the 12/24V AC/DC shunt trip.
Can the QOB31001042 be installed in a 480Y/277V panelboard?
No. This circuit breaker is rated for a maximum of 240V AC. For 480Y/277V systems, you will need a different breaker series, such as the Square D EDB, EGB, or EJB frame breakers, depending on your specific panelboard type.
Does the factory-installed shunt trip require a separate power source to operate?
Yes. The shunt trip coil must be energized by an external 12V or 24V AC/DC control circuit to remotely trip the breaker. It does not draw power from the breaker's primary load terminals.
Can I use this breaker if my system requires a 22kAIC fault current rating?
No. The QOB31001042 has a maximum interrupting rating of 10kAIC at 120/240V AC. If your system requires a 22kAIC rating, you must upgrade to the QOB-VH series, such as the QOB3100VH, and ensure it is ordered with the appropriate shunt trip suffix.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 206 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 3/11/26
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
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Rating
206 reviews
- KHKristopher H.Verified BuyerReviewingSquare D QOB120GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/28/26Great Price!
Great price. Fast delivery. My local electric distributor wanted double for the same breaker, so it was a no brainer to order this one. Ordered another one since with the same great service.
- BLBOOSTIX L.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/17/26QOB220
That's nice breakers!
- PHPaul H.Verified BuyerReviewingSquare D QOB330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Quick shipping and delivery
Shipped and delivered on time for installation at one of our projects. Thank you!
- RMRick M.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Project Mgr
Just what I needed.
- DHDoug H.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Square D QOB breakers
As always, our order arrived timely, and accurate. You can’t beat their prices that’s why we have used this company for years.