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Square D QOB120AFI AFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Square D
QOB120AFI
AFCI Miniature Circuit Breaker
Brand
Square D
SKU
QOB120AFI
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Square D QOB120AFI - 20A AFCI Miniature Circuit Breaker
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Description
Delivering branch and feeder arc-fault mitigation, this 20-amp bolt-on breaker is designed for commercial and industrial applications. It installs into Square D NQ and legacy NQOD panelboards, utilizing a standard pigtail neutral connection. While this specific model has been superseded by the combination-type QOB120CAFI to meet updated NEC requirements, it remains suitable for specific maintenance needs requiring 10kAIC at 120VAC. Features include the signature Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB120AFI |
| 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), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Special Classification | AFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | HACR, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersCan I install the QOB120AFI in a standard QO load center?
No. The QOB120AFI features a bolt-on connection specifically intended for NQ and legacy NQOD commercial panelboards. Standard residential QO load centers require plug-on circuit breakers, such as the QO120AFI.
How is the pigtail neutral on this AFCI breaker wired?
The coiled white pigtail wire must be routed and connected directly to the neutral bar inside the panelboard. The neutral wire from the branch circuit load is then terminated at the designated neutral lug on the breaker itself.
What does a bolt-on connection require for installation?
Unlike plug-on breakers that snap onto the bus, the QOB120AFI must be physically screwed directly to the panelboard bus bar. Ensure all power supplying the panel is safely disconnected and verified off before attempting to install or remove the breaker.
Can the QOB120AFI be used on multi-wire branch circuits with a shared neutral?
No. This arc-fault circuit breaker requires a dedicated neutral for the specific circuit it protects. Installing it on a circuit with a shared neutral will cause the breaker to nuisance trip.
What does combination arc-fault protection mean?
As a combination AFCI, this breaker provides comprehensive protection by detecting both parallel arcing (between line and neutral or ground) and series arcing (along a single compromised conductor).
How often should the arc-fault detection be tested?
Schneider Electric recommends pressing the integrated test button on the breaker monthly to verify that the internal arc-fault detection circuitry is functioning correctly.
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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