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Square D QOB290-1021 Miniature Circuit Breaker
- 90A
- 2 Pole
- Bolt-On
Square D
QOB290-1021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB290-1021
Quantity
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Square D QOB290-1021 - 90A 2 Pole Miniature Circuit Breaker
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Description
Part of the QO family, the Square D QOB290-1021 provides 90 amps of thermal-magnetic protection alongside remote tripping capabilities. This two-pole breaker is factory-equipped with a 120/208/240VAC shunt trip mechanism for remote load shedding. Designed for seamless integration, the unit bolts into Square D NQ and NQOD panelboards. The bolt-on mounting style ensures a rigid, vibration-resistant connection. Delivering a 10kAIC rating, it features the highly visible Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB290-1021 |
| Series | QOB |
| Amperage | 90A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Square D NQ Panelboards, Square D 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 | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhich panelboards are compatible with the QOB290-1021 circuit breaker?
This bolt-on breaker is designed specifically for installation in Square D NQ and NQOD panelboards.
What does the -1021 suffix indicate on this Square D breaker?
The -1021 suffix means the breaker includes a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be tripped remotely using an external control signal.
What wire sizes are accepted by the terminals on this breaker?
The box lugs on this unit accommodate 4 AWG to 2/0 AWG wire and are rated for use with both aluminum and copper conductors.
How does the thermal-magnetic trip mechanism function on this unit?
The fixed thermal-magnetic mechanism provides dual protection. The thermal element offers long-time protection against sustained overloads, while the magnetic element provides instantaneous protection against short circuits.
How can I visually verify if this breaker has tripped?
Square D QOB breakers feature a Visi-Trip indicator. When the breaker trips due to a fault condition, a highly visible red indicator appears in the breaker window to help you quickly identify the tripped circuit.
Can I substitute a QO290-1021 for this QOB290-1021 breaker?
No. Although they share the same electrical ratings and shunt trip accessory, the QO version features a plug-on connection. The QOB290-1021 requires a bolt-on connection to secure it to the busbar in NQ and NQOD panels.
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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