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ABB / General Electric THQB1120DF Dual Function Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
ABB / General Electric
THQB1120DF
Dual Function Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB1120DF
Quantity
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ABB / General Electric THQB1120DF - 20A Dual Function Miniature Circuit Breaker
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Description
Engineered for commercial applications, the THQB1120DF is a 20A, single-pole dual function breaker from GE. It integrates combination arc-fault (AFCI) and ground-fault (GFCI) protection to help facilities meet NEC requirements. This 120V device utilizes a secure bolt-on mounting style. It is designed to fit into GE A-Series panelboards and AQ lighting panels, accepting 14-8 AWG copper wire. Rated at 10kAIC, it features self-test functionality and is HACR and SWD rated for switching duty.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series Panelboards, GE AQ Lighting Panels |
| 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 | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | Dual Function (AFCI/GFCI) |
|---|---|
| Available Options | Padlock Attachment |
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, SWD, UL 489, UL 943, UL 1699 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Non-Interchangeable Trip, Quick-Make/Quick-Break, Self-Test |
Product FAQs
6 answersWhat panelboards are compatible with the THQB1120DF?
This breaker is designed for GE A-Series panelboards and GE AQ lighting panels. It features a bolt-on connection that fastens directly to the bus, which is standard for commercial applications rather than residential load centers.
Can I install this THQB breaker in a standard GE residential load center?
No. The THQB1120DF is a bolt-on breaker. Standard GE residential load centers require plug-on breakers, such as the THQL series.
How is the neutral connected on the THQB1120DF?
This breaker uses a pigtail neutral connection. The attached coiled white wire must be routed and secured to the panelboard neutral bus to ensure the internal AFCI and GFCI circuitry functions correctly.
What specific faults does the THQB1120DF dual function breaker detect?
As a dual function (DF) breaker, it provides both Arc Fault Circuit Interrupter (AFCI) protection against parallel and series arcs, and 5mA Ground Fault Circuit Interrupter (GFCI) protection for personnel safety.
Is this breaker suitable for systems requiring a 22kAIC rating?
No. The THQB1120DF is rated for a maximum of 10kAIC at 120V. If your panelboard requires a 22kAIC interrupting rating, you must source the THHQB1120DF dual function breaker instead.
Are GE and ABB THQB breakers the same?
Yes. ABB acquired GE Industrial Solutions and continues to manufacture the Q-Line breaker series under the same catalog numbers. The THQB1120DF may arrive in packaging branded as GE, ABB, or GE by ABB.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 110 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 4/16/26
Customers say these circuit breakers arrive quickly and work as expected. Many reviews mention fast shipping, with some receiving orders overnight or within days. Users report the breakers fit properly, install easily, and function correctly in both residential and commercial applications. Common feedback includes competitive pricing and good packaging that protects products during shipping. While most praise the ordering process as straightforward, some note occasional issues with missing installation screws or receiving updated product versions instead of pictured models. Several contractors and electricians appreciate having access to hard-to-find or obsolete breakers when local suppliers lack inventory.
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Rating
110 reviews
- SPSarah P.Verified BuyerReviewingABB / General Electric THQB1120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/15/26Exactly as Described
These are so hard to find at a good price. Will be ordering again.
- SBSeth B.Verified BuyerReviewingABB / General Electric THQB1120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/8/26Hard to find older style breakers
I am pleased to have access to these breakers. We have a number of them at our church. Local suppliers said that they had never seen this kind of breaker. They fit our panel perfectly.
- TZThomas Z.Verified BuyerReviewingABB / General Electric THQB32040 - 40A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/30/26Great company
This company is awesome. Every time I call them and I need help with something. They’re right there to help me. They’re also very knowledgeable. They go out of their way to get you the product that you need right away and not a great price.
- TDTerry D.Verified BuyerReviewingABB / General Electric THQB2130GFT - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/24/2630 AMP GFCI @ POLE
Breakers were new in box as advertised. Good turn around on orders Reasonable pricing much less than abb dealer
- LMLeslie M.Verified BuyerReviewingABB / General Electric THQB21100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/16/26Perfect fit.
Always timely with delivery and a perfect.fit.