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Square D QOB330GFI GFCI Miniature Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
Square D
QOB330GFI
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QOB330GFI
Quantity
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Square D QOB330GFI - 30A GFCI Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB330GFI - 30A GFCI Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB330GFI |
| Series | QOB |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 208Y/120VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 208Y/120VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 12-4 AWG (Al), 14-6 AWG (Cu) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| Min Wire | 12 AWG (Al), 14 AWG (Cu) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | 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, Mercury Free, RoHS Compliant |
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Square D QOB330GFI - 30A GFCI Miniature Circuit Breaker
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Quantity
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 208Y/120VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 208Y/120VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 12-4 AWG (Al), 14-6 AWG (Cu) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| Min Wire | 12 AWG (Al), 14 AWG (Cu) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | 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, Mercury Free, RoHS Compliant |
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Description
Part of the QO family, the QOB330GFI offers 30A thermal-magnetic protection alongside 6mA ground-fault interruption. This three-pole device operates on 208Y/120V systems to meet NEC standards. Designed for robust use, it mounts into Square D NQ and NQOD panelboards via a secure bolt-on connection. The breaker comes equipped with a pigtail neutral to facilitate accurate sensing. Rated for 10kAIC, it includes the Visi-Trip indicator flag to quickly locate tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB330GFI |
| Series | QOB |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 208Y/120VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 208Y/120VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 12-4 AWG (Al), 14-6 AWG (Cu) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| Min Wire | 12 AWG (Al), 14 AWG (Cu) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | 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, Mercury Free, RoHS Compliant |
Product FAQs
5 answersWhich panelboards are compatible with the QOB330GFI?
This breaker is designed for use in Square D NQ and NQOD series panelboards. It features a bolt-on connection, which securely fastens the breaker directly to the panel bus bars for commercial and industrial applications.
Can the QOB330GFI be used on a 240V ungrounded Delta system?
No. The breaker is strictly rated for 208Y/120V AC solidly grounded wye systems. It requires a proper neutral connection to power the internal ground fault circuitry and will not function correctly on straight 240V delta or ungrounded electrical systems.
What level of ground fault protection does this breaker offer?
It provides Class A ground fault protection, which is specifically designed for personnel protection. The breaker will trip and interrupt the circuit if it detects a ground fault leakage current between 4 and 6 milliamps (mA).
How is the neutral connection handled during installation?
The QOB330GFI features a pigtail neutral wire. This coiled white wire must be permanently landed on the panelboard neutral bus for the ground fault protection circuitry to operate properly.
Are the QOB330GFI and QO330GFI interchangeable?
While both breakers provide identical Class A ground fault protection and 30A capacities, they mount differently. The QOB330GFI is a bolt-on breaker commonly required in commercial environments, whereas the QO330GFI is a plug-on breaker. Always verify whether your panel or project specification mandates a bolt-on connection before substitution.
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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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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 206 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 3/11/26
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
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Rating
206 reviews
- KHKristopher H.Verified BuyerReviewingSquare D QOB120GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/28/26Great Price!
Great price. Fast delivery. My local electric distributor wanted double for the same breaker, so it was a no brainer to order this one. Ordered another one since with the same great service.
- BLBOOSTIX L.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/17/26QOB220
That's nice breakers!
- PHPaul H.Verified BuyerReviewingSquare D QOB330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Quick shipping and delivery
Shipped and delivered on time for installation at one of our projects. Thank you!
- RMRick M.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Project Mgr
Just what I needed.
- DHDoug H.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Square D QOB breakers
As always, our order arrived timely, and accurate. You can’t beat their prices that’s why we have used this company for years.