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Square D QO3801021 Miniature Circuit Breaker
- 80A
- 3 Pole
- Plug-On
Square D
QO3801021
Miniature Circuit Breaker
Brand
Square D
SKU
QO3801021
-4%
Quantity
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Square D QO3801021 - 80A 3 Pole Miniature Circuit Breaker
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Description
Built for applications requiring remote shutdown, the Square D QO3801021 features a factory-installed 120/240VAC shunt trip. This three-pole, 80-amp miniature circuit breaker delivers robust thermal-magnetic protection. The plug-on mounting style ensures an efficient installation. It fits seamlessly into Square D QO load centers, NQ panelboards, and Speed-D switchboards. Featuring a 10kAIC rating at 240VAC, this breaker includes the Visi-Trip visual indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO3801021 |
| Series | QO |
| Amperage | 80A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards, Speed-D Switchboards |
| 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 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Mercury Free, Common Trip |
Product FAQs
8 answersWhat does the 1021 suffix mean in the QO3801021 catalog number?
The 1021 suffix indicates that this circuit breaker includes a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be tripped remotely when a voltage signal is applied to the shunt trip coil.
Which panelboards and load centers are compatible with the QO3801021?
This plug-on breaker is designed for use in Square D QO load centers, NQ panelboards, and Speed-D switchboards. It is not compatible with Homeline or I-Line panels.
What wire sizes and materials are accepted by the box lugs on this breaker?
The terminals accept 4 AWG to 2/0 AWG aluminum or copper conductors. Ensure you torque the connections to the manufacturer specifications printed on the breaker label.
How does the shunt trip function operate on this breaker?
The factory-installed shunt trip requires an external 120/240VAC control signal. When energized, the coil mechanically trips the breaker to open the circuit, making it ideal for emergency shutdown or remote control applications.
Does this breaker feature a visual trip indicator?
Yes, Square D QO breakers feature the Visi-Trip indicator. When the breaker trips due to an overcurrent or via the shunt trip, the handle moves to a center position and a red indicator appears in the window to easily identify the tripped circuit.
Can the QO3801021 be used in DC applications?
Yes, in addition to its AC ratings, this breaker is rated for 48VDC applications with an interrupting capacity of 5kAIC.
Is this a bolt-on or plug-on circuit breaker?
The QO3801021 is a plug-on circuit breaker. If your panel requires a bolt-on connection, you will need the equivalent QOB version, catalog number QOB3801021.
What is the difference between the QO380 and the QO3801021?
The base QO380 is a standard 3-pole, 80A breaker. The QO3801021 includes the factory-installed 120/240VAC shunt trip accessory for remote tripping capabilities.
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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