Square D QO Series Miniature C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$429.33
Square D QO Series Miniature Circuit Breaker, Combination Arc-Fault (CAFI)

Square D QO Series Miniature Circuit Breaker, Combination Arc-Fault (CAFI)

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Model: QOB115CAFI

In Stock (leaves warehouse same day if ordered before 3pm ET)

$429.33
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Square D QO Series Miniature Circuit Breaker, Combination Arc-Fault (CAFI)

The Square D QO Series miniature circuit breaker delivers reliable overcurrent protection and switching for residential and light commercial panelboards. This unit is rated 15A, 1 pole, 120VAC, with a 10kA interrupt rating, and combines a bolt-on frame with a pigtail neutral connection for straightforward installation in compatible QO load centers. Combination arc-fault (CAFI) protection adds an extra layer of fire safety, and the breaker carries CSA and UL Listed certification for code-compliant performance.

Key Features

  • Electrical Rating: 15A, 1 pole, 120VAC for overcurrent protection sized to the branch circuit.
  • Interrupt Rating: 10kA short-circuit interrupt rating for dependable fault clearing.
  • Bolt-On Mounting: Bolt-on frame design for secure attachment in compatible QO panelboards.
  • Combination Arc-Fault (CAFI) Protection: Detects arc-fault conditions to help reduce electrical fire risk.
  • Pigtail Neutral Connection: Pigtail neutral terminal simplifies wiring at the panel.
  • Trip-Free Toggle Mechanism: Over-center, trip-free toggle with quick-make, quick-break action and positive trip indication.
  • Wire Compatibility: Accepts AWG 14...AWG 8 copper or AWG 12...AWG 8 aluminum conductors.
  • QO Series: Part of Square D's QO range of thermal magnetic circuit breakers.

Certifications & Compliance

  • CSA Certified
  • UL Listed
  • TAA Compliant
  • Mercury Free

Technical Specifications

  • Warranty: 18 months
  • Mercury Free: Yes
  • Number Of Spaces Required: 1
  • Poles Description: 1P
  • Range Of Product: QO
  • Compliance: TAA
  • Total Lifecycle Carbon Footprint: 39 kg CO2 eq.

Typical Applications

  • Residential Load Centers and Panelboards
  • Branch Circuit Overcurrent Protection
  • Arc-Fault Circuit Protection for Fire Safety Compliance
  • New Construction and Panel Upgrades or Renovation

Why Square D?

Square D is a trusted name in circuit protection, and this QO Series miniature circuit breaker reflects that reliability with CSA and UL Listed certification, a trip-free toggle mechanism, and combination arc-fault protection engineered for safety-focused electrical installations. Backed by an 18-month warranty, it is built for dependable, code-compliant performance in demanding panelboard applications.

Manufacturer Resources

Product Specs

Product Type:
GFCI/AFCI Circuit Breaker
Series:
QO
Voltage Rating:
120VAC
Amperage Rating:
15A
Configuration:
1-Pole
Listing:
UL Listed
Standards:
CSA
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers
Product Depth:
2.91 in
Product Height:
4.76 in
Product Width:
0.75 in

Square D QOB115CAFI – Frequently Asked Questions

1) Will a Square D QOB115CAFI breaker fit a plug-on QO load center?
No. The QOB115CAFI is a bolt-on breaker, so it mounts with a screw to the bus in a panelboard prepped for QOB bolt-on units. A standard residential QO load center with plug-in stabs will not take it. If your panel is plug-on, you need the plug-in QO version rather than the QOB.
2) Does the QOB115CAFI arc-fault breaker need a neutral connection at the panel?
Yes. It uses a pigtail neutral that lands on the panel neutral bar, and the branch circuit neutral terminates on the breaker itself. Arc-fault electronics need that reference to work, so you have to have a free neutral bar position available.
3) Is a CAFI breaker the same as a GFCI, or do I need both?
Combination arc-fault (CAFI) detects arcing conditions to reduce fire risk; it is not ground-fault protection for people. If the circuit needs ground-fault protection as well, a dual-function or GFCI device is the right choice, such as the ABB Q-Line THQL11 DFCI dual function AFCI/GFCI breaker or the Eaton CH Series Class A GFCI breaker with pigtail, in panels that accept those lines.
4) Is this breaker rated for a 120V bedroom branch circuit in an apartment?
Yes, that is exactly its range: 15A, 1 pole, 120VAC, with combination arc-fault protection for dwelling-unit branch circuits. It is not a 240V two-pole device, so it won't serve a dryer, range or straight 240V load.
5) Can I use this Square D arc-fault breaker in a GE or Eaton panel?
No. QOB is Square D's bolt-on frame and belongs in QO panelboards prepped for it. For other panel lines you need a breaker built for that bus, for example an ABB THQL series plug-on neutral unit for Q-Line panels or an Eaton CH Series breaker for CH panels.
6) What is the equivalent arc-fault breaker if the panel is an ABB or GE load center instead of a Square D QO?
The QOB115CAFI combination arc-fault breaker is a bolt-on QO frame breaker and only fits compatible Square D QO panelboards, so it cannot go into an ABB load center. For an ABB bus, the comparable arc-fault device is the ABB Q-Line THQL11 DFCI, which is a dual function AFCI/GFCI breaker in the THQL11 series. Match the breaker frame to the panel manufacturer; arc-fault breakers are not interchangeable across busbar designs.
7) If the circuit only needs ground-fault protection and not arc-fault, what should I use instead?
The QOB115CAFI provides combination arc-fault (CAFI) protection, which is what the code requires for dwelling branch circuits like bedrooms and living areas. If the location calls only for ground-fault protection, a GFCI-only breaker is the simpler device: on an ABB THQL bus that is the THQL Q-Line Model 3 self-test GFCI breaker, and on an Eaton CH bus it is the CH Series Class A GFCI breaker with pigtail. Those are different protection types, not lesser versions of the same device, so confirm what the circuit is required to have before substituting.
8) I need a two-pole fault-protection breaker for a 240V circuit - will the QOB115CAFI work?
No. The QOB115CAFI is a 1-pole device rated 120VAC, so it serves single-phase 120V branch circuits and occupies one panel space. A 240V two-pole load needs a two-pole fault-protection breaker; in the comparable set that is the ABB THQB 2-pole GFT breaker rated 10kA at 240V, which belongs to the ABB THQB series and goes into an ABB bus, not a Square D QO panelboard.
9) What wire sizes will the Square D QO 15A arc-fault breaker accept?
Terminals take AWG 14 through AWG 8 copper, or AWG 12 through AWG 8 aluminum. At a 15A rating you will normally be landing 14 AWG copper, and the terminal still accepts larger conductors if the circuit was pulled heavier for voltage drop.
10) How much panel space does one QOB115CAFI take up?
One pole, one space. The breaker is 0.75 in wide, 4.76 in high and 2.91 in deep, so it occupies a single standard QO space and clears a typical load center cover depth.
11) What is the short-circuit interrupting rating on the Square D QO CAFI breaker?
10kA. That covers the available fault current at most residential and light commercial service panels, which is what determines whether the breaker is acceptable where it is being installed.
12) Is the QO CAFI breaker UL Listed and CSA certified for inspection?
It is UL Listed and CSA certified, and the arc-fault function is covered by that listing. It is also TAA compliant and mercury free, which matters on federally funded and institutional work.
13) Is the ABB THQL11 DFCI a drop-in substitute for the Square D QOB115CAFI?
No. Both are arc-fault breakers, but the ABB Q-Line THQL11 DFCI is a dual function device that combines AFCI and GFCI protection, while the QOB115CAFI is combination arc-fault only, rated 15A, 1 pole, 120VAC. The two also use different manufacturer bus and mounting systems, so the THQL11 will not seat in a QO panelboard. Treat them as parallel solutions for two different panel brands rather than interchangeable parts.
14) My panel uses plug-on neutral breakers - does the QOB115CAFI fit?
The QOB115CAFI uses a bolt-on QO frame with a pigtail neutral lead that lands on the panel neutral bar, so it is intended for compatible Square D QO panelboards with that prep rather than a plug-on neutral bus. If the load center is built around plug-on neutral breakers, the comparable device on an ABB bus is the THQL Series plug-on neutral ground fault breaker rated 10kAIC. Check whether the panel neutral bus accepts a plug-on connection before ordering either style.
15) How does the Eaton CH Series GFCI with pigtail differ from the Square D QOB115CAFI?
Both land their neutral with a pigtail lead, but the protection type and panel family differ. The Eaton CH Series breaker is a Class A GFCI device for Eaton CH load centers, while the QOB115CAFI is a combination arc-fault breaker rated 15A, 1 pole, 120VAC with a 10kA interrupt rating and UL Listed and CSA certification, built on the Square D QO bolt-on frame. Pick by what the circuit must be protected against and by the brand of the existing panel.
16) How do I tell if this breaker tripped on an arc fault versus overload?
The QO CAFI uses an over-center, trip-free toggle with quick-make, quick-break action and positive trip indication, so the handle shows a tripped state rather than sitting ambiguously between on and off. You reset by pushing fully to off, then on.
How fast can I get the Square D QOB115CAFI delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D QOB115CAFI come with a warranty?
Absolutely. The Square D QOB115CAFI is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D QOB115CAFI?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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