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Square D QO2801021 Miniature Circuit Breaker
- 80A
- 2 Pole
- Plug-On
Square D
QO2801021
Miniature Circuit Breaker
Brand
Square D
SKU
QO2801021
Quantity
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Square D QO2801021 - 80A 2 Pole Miniature Circuit Breaker
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Description
Designed for advanced control applications, the Square D QO2801021 provides 80A of thermal-magnetic protection with remote tripping capabilities. It secures 120/240V commercial and industrial circuits. The breaker mounts into QO load centers, NQ, and NQOD panelboards using a convenient plug-on connection. A factory-installed 120/208/240V AC shunt trip allows facility managers to open the circuit remotely via a separate push-button or control system.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO2801021 |
| Series | QO |
| Amperage | 80A |
| 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, 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 | Shunt Trip (120/208/240VAC) |
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip |
Product FAQs
7 answersWhat does the 1021 suffix mean on the QO2801021 part number?
The 1021 suffix indicates that this breaker includes a factory-installed 120/208/240V AC shunt trip. This accessory allows the breaker to be tripped remotely using a separate control signal or push-button.
Which panelboards accept the QO2801021 circuit breaker?
This plug-on breaker is compatible with Square D QO load centers, as well as NQ and NQOD panelboards. It requires two standard spaces on the busbar for installation.
How does the shunt trip function operate on this breaker?
The integrated shunt trip requires an external 120V to 240V AC control voltage. When power is applied to the shunt trip leads, it activates a coil that mechanically trips the breaker, opening the circuit for remote shutdown or safety interlocking.
What type of trip indication does this breaker provide?
It features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent event or a remote shunt trip command, a red flag appears in the indicator window to help quickly identify the open circuit.
What are the wire size limits for the terminals on the QO2801021?
The box lugs are rated to accept 4 AWG through 2/0 AWG conductors. Both copper and aluminum wire can be used, provided they are torqued to the specifications printed on the breaker label.
How does the thermal-magnetic trip mechanism protect the circuit?
The breaker uses fixed long-time and instantaneous (LI) trip functions. The thermal element provides a delayed trip for sustained overloads, while the magnetic element trips instantaneously in the event of a short circuit.
Is the QO2801021 suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires overcurrent protection.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 285 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
285 reviews
- 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
- JCJerry C.Verified BuyerReviewingSquare D QO250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26Great quality
No issues