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Square D QO350GFI GFCI Miniature Circuit Breaker
- 50A
- 3 Pole
- Plug-On
Square D
QO350GFI
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QO350GFI
Quantity
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Square D QO350GFI - 50A GFCI Miniature Circuit Breaker
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Quantity
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Description
Engineered for commercial and industrial applications, this three-pole 50A ground-fault interrupter delivers Class A 6mA personnel protection. The unit mounts into standard QO load centers and NQ panelboards using a secure plug-on connection and includes a pigtail neutral for straightforward wiring. Featuring Visi-Trip technology for rapid fault identification, it meets strict NEC requirements for wet or damp locations while maintaining a 10kA interrupt rating at 208Y/120VAC.Specifications
| Brand | Square D |
|---|---|
| Series | QO |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 208Y/120VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 208Y/120VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 14-6 AWG (Cu), 12-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| 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, Shunt Trip |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 5, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Mercury Free, Common Trip |
Product FAQs
8 answersWill the QO350GFI fit in a Square D Homeline panel?
No. The QO350GFI is a QO format breaker and is not compatible with Homeline load centers. It is designed exclusively for use in Square D QO load centers and NQ panelboards.
Can I use the QO350GFI for a standard single-phase residential hot tub?
No. The QO350GFI is a 3-pole breaker intended for 3-phase systems up to 208Y/120VAC. Most standard residential hot tubs require a 2-pole breaker, such as the QO250GFI, for 120/240V single-phase service.
What is the ground fault trip threshold for the QO350GFI?
This breaker provides Class A ground fault protection. The GFCI circuitry is designed to trip when a fault current to ground reaches 6 milliamperes (mA) or more, which meets NEC requirements for personnel protection.
How many panel spaces does the QO350GFI require?
This 3-pole breaker requires three standard 3/4-inch spaces in a compatible QO load center or NQ panelboard.
Does the QO350GFI feature Visi-Trip indication?
Yes. When the breaker trips due to an overcurrent or ground fault condition, a highly visible red flag appears in the indicator window to help you rapidly identify the tripped circuit.
How do I connect the neutral on this circuit breaker?
The QO350GFI features a factory-attached pigtail neutral wire. This coiled white wire must be terminated directly to the neutral bus bar in the panelboard to power the internal ground fault detection circuitry.
Is there a limit to the circuit length when using this GFCI breaker?
Yes. Square D recommends that the one-way run of the load conductor should not exceed 250 feet. Connecting to a load conductor longer than 250 feet increases the risk of nuisance tripping due to normal capacitive leakage.
What is the difference between the QO350GFI and the QO350EPD?
The QO350GFI provides Class A personnel protection with a 6 mA ground fault trip threshold. The QO350EPD is an Equipment Protection Device (EPD) that offers Class B protection with a 30 mA trip threshold. They are engineered for different code requirements and cannot be used interchangeably for personnel safety.
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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