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Square D QO330GFI GFCI Miniature Circuit Breaker
- 30A
- 3 Pole
- Plug-On
Square D
QO330GFI
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QO330GFI
Quantity
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Square D QO330GFI - 30A GFCI Miniature Circuit Breaker
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Description
Built to safeguard three-phase 208Y/120V circuits, this 30A thermal-magnetic breaker provides essential Class A ground fault protection. The integrated pigtail neutral and Visi-Trip visual indicator streamline both setup and ongoing maintenance for electrical contractors. Designed specifically for Square D QO load centers and NQ panelboards, the plug-on configuration ensures a secure fit. Pressure plate terminals accept 14-8 AWG copper or 12-8 AWG aluminum conductors.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO330GFI |
| Series | QO |
| Amperage | 30A |
| 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 Thermal, Fixed Magnetic |
| Special Classification | GFCI |
|---|---|
| Available Options | Padlock Attachment, Handle Tie |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 144, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Mercury Free, RoHS Compliant |
Product FAQs
5 answersWhich panels are compatible with the QO330GFI circuit breaker?
This plug-on breaker is designed exclusively for Square D QO load centers and NQ panelboards. It cannot be installed in Homeline panels or other brands.
How many panel spaces does the QO330GFI require?
As a 3-pole breaker, it requires three standard 3/4-inch spaces in a QO load center or NQ panelboard.
What level of ground fault protection does the QO330GFI provide?
This breaker provides Class A ground fault protection, which is designed to trip when a fault current to ground reaches 6 mA or more to protect personnel.
How do I wire the neutral connection for the QO330GFI?
The breaker includes a white factory-installed pigtail that must be connected directly to the panel neutral bus bar. This powers the internal ground-fault sensing circuitry, even if the connected 3-phase load does not require a neutral conductor.
What types of applications typically require a 3-pole 30A GFCI breaker?
This breaker is commonly used for 3-phase 208Y/120V commercial equipment in wet environments, such as commercial pool pumps, hot tubs, fountains, and commercial kitchen equipment that mandates Class A personnel protection.
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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.
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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