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Square D QO320SWN Miniature Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Square D
QO320SWN
Miniature Circuit Breaker
Brand
Square D
SKU
QO320SWN
Quantity
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Square D QO320SWN - 20A 3 Pole Miniature Circuit Breaker
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Description
Tailored for applications requiring complete circuit isolation, the QO320SWN simultaneously disconnects two hot legs and the neutral conductor. This 20A plug-on breaker fits standard QO load centers and NQ panelboards, occupying three spaces. The switched neutral functionality is frequently utilized in fuel dispensing stations and specific commercial equipment setups to meet stringent safety codes.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO320SWN |
| Series | QO |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Pressure Plate |
|---|---|
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 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 | Switch Neutral (Factory Included) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Common Trip |
| Special Features | Switching Neutral |
Product FAQs
8 answersWhat is the purpose of the switched neutral feature on the QO320SWN?
The switched neutral simultaneously disconnects two hot legs and the neutral conductor. This provides complete circuit isolation, which is often required by safety codes for specific applications like fuel dispensing stations and certain commercial equipment.
How many panel spaces does this breaker require?
As a 3-pole breaker, it occupies three standard spaces in a compatible Square D QO load center or NQ panelboard.
Can I install this breaker in a Square D Homeline panel?
No. QO series breakers have a specific plug-on mounting design that is not interchangeable with Homeline panels. It must be installed in a QO load center or NQ panelboard.
Do I need special terminals to use aluminum wire with this breaker?
No special terminals are required. The factory-installed pressure plate terminals are dual-rated for both aluminum and copper conductors, accepting wire sizes from 14 AWG up to 8 AWG.
How does the Visi-Trip indicator work on this model?
When the breaker trips due to an overload or short circuit, a red visual indicator appears in the window. This allows electricians to quickly identify the tripped breaker in a crowded panel.
What does the LI trip function indicate?
The LI code stands for Long-Time and Instantaneous trip functions. The thermal-magnetic mechanism provides Long-Time protection against sustained overloads and Instantaneous protection against sudden short circuits.
Is this breaker rated for commercial use?
Yes, the QO320SWN is commonly used in commercial and industrial settings that require a switched neutral for safety compliance. It carries a 10kA interrupting rating at 120/240V AC.
Why choose a plug-on breaker over a bolt-on breaker for this application?
Plug-on breakers like the QO320SWN allow for faster installation and replacement in QO load centers and NQ panelboards compared to bolt-on alternatives, while still providing a secure, reliable connection to the busbar.
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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