Square D QOB-DF QO Series Dual...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$491.07
Square D QOB-DF QO Series Dual Function Miniature Circuit Breaker, 1-Pole, Bolt-On

Square D QOB-DF QO Series Dual Function Miniature Circuit Breaker, 1-Pole, Bolt-On

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Model: QOB120DF

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

$491.07
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Square D QOB-DF QO Series Dual Function Miniature Circuit Breaker, 1-Pole, Bolt-On

The Square D QOB-DF QO Series Dual Function Miniature Circuit Breaker delivers overcurrent protection and switching for AC and DC systems in a 1-pole, 120VAC configuration with a 10kA interrupt rating. This bolt-on breaker is available across a range of amperage ratings from 15A to 20A, letting installers match branch-circuit protection to the load while retaining the same dual-function (DF) design in every option. Built with an over-center, trip-free toggle mechanism for quick-make, quick-break action, it combines Combination Arc-Fault (CAFI) and Ground-Fault (GFCI) protection in a single device. It is UL Listed and CSA certified, HACR rated, and finished with a pigtail neutral connection for straightforward installation in QO series load centers and panelboards.

Key Features

  • Dual Function Protection: Combines Combination Arc-Fault (CAFI) and Ground-Fault (GFCI) circuit protection in one device for enhanced branch-circuit safety.
  • 1-Pole, 120VAC Rating: Rated operational voltage (Ue) of 120 V AC for single-pole residential and commercial branch circuits.
  • Amperage Range: Available in amperage ratings from 15A to 20A to suit a variety of branch-circuit loads.
  • 10kA Interrupt Rating: Provides reliable fault-current interruption for QO series panelboard applications.
  • Bolt-On Mounting: Bolt-on style construction for secure, vibration-resistant installation in compatible QO load centers.
  • Trip-Free Toggle Mechanism: Over-center, quick-make, quick-break toggle action with positive trip-free operation on both AC and DC systems.
  • Pigtail Neutral Connection: Pressure-plate electrical connection with pigtail neutral terminal for wire ranges of AWG 14...AWG 8 copper or aluminum, or AWG 14...AWG 10 copper.
  • HACR Rated: Suitable for heating, air conditioning, and refrigeration equipment circuits.
  • Installation Specs: Tightening torque of 4-4 N.m, rated for 40 °C ambient air temperature, and requires 1 panel space.

Certifications & Compliance

  • UL Listed
  • CSA Certified
  • TAA Compliant

Technical Specifications

  • Product Or Component Type: miniature circuit-breaker
  • Poles Description: 1P
  • Range Of Product: QO
  • H And D Enrichment Function: DF
  • Ambient Air Temperature For Operation: 40 °C
  • Number Of Spaces Required: 1
  • Compliance: TAA
  • Mercury Free: Yes

Typical Applications

  • Residential and Commercial Load Centers
  • QO Series Panelboards
  • Branch-Circuit Arc-Fault and Ground-Fault Protection
  • HACR Equipment Circuits
  • New Construction and Panel Retrofits

Why Square D?

Square D engineers the QO Series with a trip-free, quick-make quick-break toggle mechanism and dual-function CAFI plus GFCI protection to deliver dependable, code-compliant circuit protection across its full amperage lineup. Backed by UL Listed and CSA certification and built for compatibility with QO load centers, this breaker is designed for reliable performance in professional electrical installations.

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Manufacturer Resources

Product Specs

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

Square D QOB120DF – Frequently Asked Questions

1) Will a Square D QOB-DF dual function breaker fit a plug-on QO load center?
No. The QOB-DF is a bolt-on breaker, so it mounts with a screw to the bus in panelboards prepped for bolt-on QOB breakers. A plug-on QO panel takes the plug-in QO style instead. If the existing breakers in the panel snap on without a mounting screw, this is the wrong device for that panel.
2) What amp ratings does the Square D QOB-DF 1-pole dual function breaker come in?
Two: 15A (QOB115DF) and 20A (QOB120DF). Both are single pole, 120V AC, with the same CAFI plus GFCI dual function protection, so you pick purely on the branch circuit load, 15A for general lighting and receptacle circuits on 14 AWG, 20A for 12 AWG circuits.
3) Does one dual function breaker satisfy both the arc-fault and GFCI requirements on a branch circuit?
Yes. The QOB-DF combines Combination Arc-Fault (CAFI) and Ground-Fault (GFCI) protection in a single device, so one breaker covers both on that circuit instead of pairing an AFCI breaker with a GFCI receptacle. That matters on kitchen and laundry circuits where both protections apply.
4) How do I wire the pigtail neutral on a QOB-DF breaker, and what wire sizes does it take?
The white pigtail lands on the panel neutral bar, and the circuit neutral comes back to the breaker's neutral terminal, not the bar, which is what lets the device sense ground fault. Terminals accept AWG 14 to AWG 8 copper or aluminum, or AWG 14 to AWG 10 copper, with a pressure-plate connection. Torque the connections per the printed 4 N.m value.
5) Is the Eaton BAB bolt-on breaker a substitute for a Square D QOB115DF?
No. The Eaton BAB series Quicklag breaker is a thermal-magnetic bolt-on breaker, so it provides overcurrent protection only. The Square D QOB-DF is a dual function device that adds Combination Arc-Fault (CAFI) and Ground-Fault (GFCI) protection in the same 1-pole, 120VAC bolt-on body, and it is built for QO series load centers and panelboards. If the circuit is being protected to an AFCI/GFCI requirement, the BAB will not satisfy it; if the panel is an Eaton loadcenter, the QOB-DF will not fit it.
6) Can I use an ABB ST200M miniature breaker instead of a Square D QOB-DF on a branch circuit?
They are not interchangeable. The ABB ST200M is a C-curve miniature circuit breaker listed to UL1077, which is a supplementary protector standard used inside equipment rather than a branch-circuit breaker. The Square D QOB-DF is a UL Listed bolt-on breaker for QO load centers and panelboards, rated 120VAC, 1-pole, with CAFI and GFCI protection for branch circuits. Supplementary protectors cannot stand in for branch-circuit overcurrent protection.
7) I need three-pole protection, not single-pole. What should I look at instead of the QOB-DF?
The Square D QOB-DF is a 1-pole device and occupies one panel space, so it cannot serve a three-phase or three-pole load. For a three-pole bolt-on thermal-magnetic breaker, the Eaton BAB Quicklag 3-pole 240V breaker covers that configuration. For larger three-pole molded case applications, the ABB A2 series A2A150TT and the ABB XT4 and XT5 series kits are 3-pole molded case breakers. None of those carry the arc-fault and ground-fault sensing the QOB-DF provides.
8) How much panel space does a Square D QOB-DF breaker take up?
One space. The body is 0.75 in wide, 4.76 in high and 2.91 in deep, so a dual function QOB-DF drops into a single pole position without stealing the slot next to it, unlike older two-space AFCI/GFCI designs.
9) Is a 10kA interrupting rating enough for my panelboard?
The QOB-DF is rated 10kA interrupting at 120V AC. That covers the available fault current at most residential and light commercial branch panel locations. On a large commercial service, or where a short run feeds off a big transformer, have the available fault current at that panel confirmed against the 10kA figure before using it.
10) Can I use a QOB-DF breaker on an air conditioning or refrigeration circuit?
Yes, it is HACR rated, so it can serve heating, air conditioning and refrigeration equipment branch circuits. Keep in mind the ratings available are 15A and 20A single pole at 120V, so it suits 120V equipment and condensate pumps rather than a 240V two-pole condenser.
11) Is the Square D QOB-DF UL Listed and acceptable for a government job?
It is UL Listed and CSA certified, and the description states TAA compliance, which is what a federal or institutional buyer usually needs for domestic-preference procurement. Country of origin is Mexico.
12) What is the difference between a bolt-on miniature breaker like the QOB-DF and an Eaton BAB bolt-on?
Both are bolt-on miniature breakers, but they are not interchangeable: the QOB-DF fits Square D QO bus prep, and the Eaton BAB series is thermal-magnetic bolt-on for Eaton panels. The bigger functional difference is protection type, the QOB-DF adds combination arc-fault and ground-fault sensing, while the BAB Quicklag is overcurrent only. Match the breaker to the panel brand first, then the protection function.
13) Will a QOB-DF work in a 240V two-pole application?
No. It is a single pole device with a rated operational voltage of 120V AC, so it protects one 120V branch circuit only. A 240V load needs a two-pole breaker.
14) Are Bussmann CBC or CBF breakers an alternative to a Square D QOB-DF for 12V or 24V DC work?
No, and the reverse is also true. The Bussmann CBC and CBC-B are Type I automotive circuit breakers rated 14VDC, and the CBF is a Type II automotive breaker, all intended for vehicle and low-voltage DC circuits with stud or similar terminals. The Square D QOB-DF is a 120VAC, 1-pole bolt-on breaker that mounts in QO series load centers and panelboards. Neither will physically or electrically serve the other application.
15) Will a Square D QOB-DF work in place of a molded case breaker like the ABB A2A150TT or an Eaton Series C K-frame?
No. The Square D QOB-DF is a miniature circuit breaker occupying a single panel space, 0.75 in wide, 1-pole at 120VAC, for QO load centers. The ABB A2A150TT is a 3-pole molded case breaker and the Eaton Series C K-frame is a 400A 3-pole molded case breaker with an interchangeable rating plug. Those are feeder and equipment-class devices in their own enclosures and frames, not branch-circuit plug-in or bolt-on breakers for a residential or commercial load center.
16) I need overcurrent protection only, not arc-fault. Is there a simpler breaker than the QOB-DF?
If the circuit does not require AFCI or GFCI, a straight thermal-magnetic miniature breaker is the simpler buy. In bolt-on form, Eaton's BAB Quicklag series covers that for Eaton panels, including three-pole 240V versions like the BAB-302 for industrial loads. On a Square D QO bolt-on panel, specify a plain QOB breaker in the amperage you need rather than the DF version.
17) Can I standardize on the QOB-DF across a multi-family building's panels?
It works as a standard if the panels are QO bolt-on panelboards, since the 15A and 20A ratings cover typical dwelling-unit lighting and receptacle circuits with the same dual function design in both. The breaker is rated for 40 C ambient air temperature, so watch closets and mechanical rooms that run hotter than that.
How fast can I get the Square D QOB120DF delivered?
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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 QOB120DF come with a warranty?
Absolutely. The Square D QOB120DF 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 QOB120DF?
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