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Square D QO290-1021 Miniature Circuit Breaker
- 90A
- 2 Pole
- Plug-On
Square D
QO290-1021
Miniature Circuit Breaker
Brand
Square D
SKU
QO290-1021
Quantity
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Square D QO290-1021 - 90A 2 Pole Miniature Circuit Breaker
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Description
Part of the QO series, the QO290-1021 is a two-pole, 90-amp miniature circuit breaker for commercial and industrial 120/240VAC systems. It combines thermal-magnetic protection with advanced control. This plug-on unit mounts into Square D QO load centers and NQ panelboards. The standardized design ensures a secure fit and reliable power distribution across compatible enclosures. A factory-installed 120/240VAC shunt trip accessory enables remote tripping via an external signal.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO290-1021 |
| Series | QO |
| Amperage | 90A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 4-2/0 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 | Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489, RoHS, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip, Trip-Free Mechanism, Quick-Make/Quick-Break |
Product FAQs
6 answersWhat panels are compatible with the QO290-1021 circuit breaker?
This plug-on breaker is designed for use in Square D QO load centers and NQ panelboards. It is not compatible with Homeline (HOM) or QOB bolt-on panels.
What does the -1021 suffix mean on this Square D QO breaker?
The -1021 suffix indicates that the breaker includes a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be tripped remotely via an external voltage signal.
How is the shunt trip wired on the QO290-1021?
The factory-installed shunt trip features two wire leads. To enable remote tripping, connect these leads to a 120V to 240V AC control circuit, typically routed through a normally open contact on a remote switch, emergency stop, or fire suppression system.
Is the QO290-1021 HACR rated?
Yes, like most Square D QO miniature circuit breakers, this unit is HACR rated for use with heating, air conditioning, and refrigeration equipment.
Does this breaker feature a Visi-Trip indicator?
Yes, the QO290-1021 includes Square D's Visi-Trip indicator. When the breaker trips, the handle snaps to a center position and a highly visible red indicator appears, making it easy to identify the tripped circuit.
What is the difference between the QO290-1021 and the QOB290-1021?
The QO290-1021 is a plug-on breaker designed for QO load centers, while the QOB290-1021 is a bolt-on breaker designed for NQOB and NQ panelboards. They share the same electrical ratings but have different mounting styles.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 286 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 6/13/26
Customers say these circuit breakers arrive quickly and work as described. Fast shipping and competitive pricing are frequently mentioned, with many noting same-day or next-day delivery. Users appreciate the wide inventory, particularly for hard-to-find older-style models unavailable locally. The products function reliably and arrive in good condition. Most customers report straightforward ordering and positive interactions. However, some experienced delivery delays or received incorrect items requiring reordering. A few noted concerns about condition upon arrival or customer service responsiveness.
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Rating
286 reviews
- RBRobert B.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/5/26Square D Q0120-20A circuit breaker
This device was delivered on time as advertised and it was in excellent condition. The installation process was simple and straightforward, and the unit worked perfectly when connected to the electric circuit.
I am completely satisfied and will utilize this component resource for my future electrical needs.
- GCGerard C.Verified BuyerReviewingSquare D QO130GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Great !
I could not find the breaker in hardwood stores. Superbreakers took car of it in a week.
- RHRoy H.Verified BuyerReviewingSquare D QO280 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/17/26Square D QO280 - 80A 2 Pole Miniature Circuit Breaker
Exactly as described
- KWKevin W.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/15/26Great Price
Brand spanking new!
- CEchristopher e.Verified BuyerReviewingSquare D QO115PDF - 15A Dual Function Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26My breakers
Had a hard time locating these breakers locally, when I did find 1 they wanted to charge me triple what superbreakers charged. Items delivered exactly when they said they would, were exactly what I ordered. Appreciated the ease of ordering, definitely my go to from this point on