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Square D QOB2901021 Miniature Circuit Breaker
- 90A
- 2 Pole
- Bolt-On
Square D
QOB2901021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB2901021
Quantity
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Square D QOB2901021 - 90A 2 Pole Miniature Circuit Breaker
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Description
Designed for commercial and industrial applications, this two-pole 90A miniature circuit breaker incorporates a factory-installed shunt trip for remote operation. The bolt-on mounting style ensures a secure connection within Square D NQ and legacy NQOD panelboards, preventing accidental disconnection in high-vibration environments. Rated for 10kA interrupting capacity at 120/240V, it includes the signature Visi-Trip indicator to quickly identify tripped circuits during maintenance checks.Specifications
| Brand | Square D |
|---|---|
| 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 | 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 |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat panelboards are compatible with the QOB2901021?
This bolt-on circuit breaker is designed for installation in Square D NQ and NQOD panelboards.
What does the 1021 suffix indicate on the QOB2901021?
The 1021 suffix signifies that this breaker includes a factory-installed 120/208/240V AC shunt trip for remote tripping applications.
What voltage is required to operate the shunt trip on this breaker?
The factory-installed shunt trip, indicated by the 1021 suffix, operates on 120V, 208V, or 240V AC.
How many panel spaces does the QOB2901021 require?
Although it is a 2-pole breaker, the factory-installed shunt trip requires an additional pole space. It will occupy 3 pole spaces total in the panelboard.
Can I field-install a shunt trip on a standard QOB 90A breaker?
No. Square D shunt trips for QO and QOB miniature circuit breakers must be factory-installed. If your application requires a shunt trip, you must order a breaker with the appropriate suffix, such as 1021.
What wire sizes are accepted by the shunt trip terminals?
The shunt trip accessory terminals accept two 14 AWG to 12 AWG copper wires. The hot and neutral control wires can be connected to either terminal.
Does the QOB2901021 feature a tripped circuit indicator?
Yes, this breaker includes Square D's Visi-Trip indicator. When the breaker trips, the handle snaps to a midpoint position and a highly visible red indicator appears in a window on the breaker case, allowing you to easily identify the tripped circuit.
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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