Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Square D QO320GFI GFCI Miniature Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Square D
QO320GFI
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QO320GFI
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D QO320GFI - 20A GFCI Miniature Circuit Breaker
New
Quantity
Similar Items
30A GFCI Miniature Circuit Breaker
40A GFCI Miniature Circuit Breaker
50A GFCI Miniature Circuit Breaker
Description
Engineered for commercial and industrial applications, this 20A three-pole device delivers Class A ground fault protection for 208Y/120V three-phase systems. It features a pigtail neutral connection and Square D's signature Visi-Trip indicator for rapid fault identification. Mounting securely into standard QO load centers and NQ panelboards, the unit utilizes a plug-on design with pressure plate terminals.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO320GFI |
| Series | QO |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 208Y/120VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 208Y/120VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No 144, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Product FAQs
8 answersIs the QO320GFI compatible with Homeline load centers?
No, this breaker is specifically designed for use in Square D QO load centers and NQ panelboards. It cannot be installed in Homeline panels, which require HOM series breakers.
How many panel spaces does the QO320GFI require?
This circuit breaker requires three adjacent 3/4-inch spaces in a compatible QO load center or NQ panelboard.
How is the neutral connection made for this ground fault breaker?
The QO320GFI is equipped with a pigtail neutral wire. This wire must be routed and connected directly to the neutral bus bar in your panel for the ground fault protection to function correctly.
What is the maximum recommended load conductor length for this GFCI breaker?
To prevent nuisance tripping due to line capacitance, Square D recommends that the total one-way run of the load conductor does not exceed 250 feet.
What is the ground fault trip threshold for the QO320GFI?
As a Class A ground fault circuit interrupter, this breaker is designed to trip when a ground fault current of 6 mA or higher is detected, providing personnel protection against electrical shock.
How can I visually identify if the QO320GFI has tripped?
This breaker features Square D's Visi-Trip indicator, which displays a highly visible red flag in the indicator window when the breaker has tripped due to an overload, short circuit, or ground fault.
What is the catalog number for the standard version of this breaker without ground fault protection?
If ground fault sensing is not required for your specific application, the standard thermal-magnetic equivalent circuit breaker is catalog number QO320.
Is there an Equipment Protection Device (EPD) version of this circuit breaker?
Yes. If your application requires 30 mA equipment ground fault sensing rather than 6 mA personnel protection, the correct alternate part number is QO320EPD.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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.
Search
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