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Square D QOB2100-1042 QOB21001042 - 100A 2 Pole Miniature Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Square D
QOB2100-1042
QOB21001042 - 100A 2 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB2100-1042
Quantity
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Square D QOB21001042 - 100A 2 Pole Miniature Circuit Breaker
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Description
Designed for demanding commercial applications, this two-pole, 100A miniature circuit breaker provides reliable thermal-magnetic protection. It mounts securely into NQ and NQOD panelboards via a bolt-on connection, ensuring excellent stability. What sets this model apart is its factory-installed 12/24V AC/DC shunt trip for low-voltage remote tripping. It offers a 10kAIC rating at 120/240VAC and features the Visi-Trip visual indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB2100-1042 |
| Series | QOB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 4 AWG-2/0 AWG (Cu/Al) |
| 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 | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
8 answersWhat does the -1042 suffix indicate on the QOB2100-1042?
The -1042 suffix means this breaker is equipped with a factory-installed 12/24V AC/DC shunt trip. This allows for remote tripping of the breaker using a low-voltage control signal.
Which panelboards are compatible with this bolt-on breaker?
The QOB2100-1042 is designed exclusively for use in Square D NQ and NQOD panelboards.
Can I use the QOB2100-1042 in a standard QO load center?
No. This breaker features a bolt-on mounting design intended for commercial panelboards. Standard QO load centers require plug-on breakers.
What wire sizes and materials are supported by the box lugs?
The terminals on this 100A breaker accept both copper and aluminum conductors ranging from 4 AWG to 2/0 AWG.
Is this breaker suitable for direct current (DC) systems?
Yes. Alongside its standard 120/240VAC rating, this breaker is rated for 48VDC applications with an interrupting capacity of 5kA.
Does this breaker include GFCI or AFCI protection?
No. This model provides standard thermal-magnetic protection with long-time and instantaneous (LI) trip functions. It does not offer ground fault or arc fault protection.
How does the factory-installed shunt trip operate?
The integrated shunt trip allows the breaker to be opened remotely when a 12/24V AC or DC voltage is applied to the coil. This is commonly used for emergency power-off (EPO) systems or remote control applications.
What is the difference between QO and QOB circuit breakers?
QO breakers are plug-on units typically used in residential load centers. QOB breakers feature a bolt-on connection for secure, vibration-resistant installation in commercial NQ and NQOD panelboards.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 205 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
205 reviews
- 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.
- RKRyan K.Verified BuyerReviewingSquare D QOB230VH - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26Awesome
Worked great