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Square D QOB120GFI GFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Square D
QOB120GFI
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QOB120GFI
Quantity
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Square D QOB120GFI - 20A GFCI Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB120GFI - 20A GFCI Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB120GFI |
| Series | QOB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Cu/Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| 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 | UL 489, CSA C22.2 No. 144 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Quantity
Square D QOB120GFI - 20A GFCI Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB120GFI-R |
| Series | QOB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Cu/Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| 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 | UL 489, CSA C22.2 No. 144 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
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Description
Rated for 20 amps at 120VAC, the QOB120GFI provides essential Class A 6mA ground fault protection for commercial environments. This single-pole breaker utilizes thermal-magnetic trip technology to safeguard against overloads. Featuring a robust bolt-on connection, it mounts securely into Square D NQ and NQOD panelboards. With a 10 kAIC interrupt rating, this unit includes the signature Visi-Trip indicator to easily spot tripped circuits and a pigtail neutral for code-compliant wiring.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB120GFI |
| Series | QOB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Cu/Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| 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 | UL 489, CSA C22.2 No. 144 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Product FAQs
8 answersCan I install the QOB120GFI in a standard residential QO load center?
No. The QOB120GFI features a bolt-on connection designed specifically for commercial NQ and NQOD panelboards. Standard QO load centers require plug-on circuit breakers.
What level of ground fault protection does the QOB120GFI provide?
This circuit breaker provides Class A ground fault protection. It is designed to trip when the ground leakage current reaches 4 to 6 milliamperes to protect personnel against electrical shock.
How does the QOB120GFI indicate a tripped condition?
It features the Square D Visi-Trip indicator. When the breaker trips due to an overload, short circuit, or ground fault, the handle moves to a center position and a highly visible red flag appears in the indicator window.
How is the neutral connection wired on this GFCI breaker?
The QOB120GFI includes a factory-attached pigtail neutral wire. This coiled white wire must be routed and connected securely to the panelboard neutral bar to power the internal ground fault sensor.
How much panel space does the QOB120GFI require?
As a standard 1-pole QOB format circuit breaker, it occupies exactly one 0.75-inch space on the panelboard bus.
What is the plug-on equivalent for the QOB120GFI?
The QO120GFI is the direct plug-on equivalent. It has identical electrical ratings and GFCI capabilities but utilizes a clip-on mounting mechanism for standard QO load centers instead of a bolt-on connection.
What does the LIG trip function indicate on the QOB120GFI?
LIG specifies the protection types included in this breaker. It provides thermal protection against sustained overloads (Long-Time), magnetic protection against short circuits (Instantaneous), and electronic monitoring for leakage current to ground (Ground Fault).
Does the QOB120GFI require manual testing?
Yes. The circuit breaker features a built-in push-to-test button on the front face. It must be pressed after installation and regularly during maintenance to verify the internal ground fault sensing circuitry is operating properly.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 205 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
205 reviews
- 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.
- RKRyan K.Verified BuyerReviewingSquare D QOB230VH - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26Awesome
Worked great