ABB / General ElectricTHQB1120AF2
ABB / General Electric THQB1120AF AFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
ABB / General Electric
THQB1120AF
AFCI Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB1120AF
Quantity
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ABB / General Electric THQB1120AF - 20A AFCI Miniature Circuit Breaker
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Description
Engineered for commercial and industrial applications, this 20-amp single-pole breaker provides essential branch and feeder arc fault mitigation. It helps facilities meet older NEC requirements for specific circuit types. The bolt-on design mounts securely into GE A-Series panelboards, AQ lighting panels, and ReliaGear RQ enclosures. Note that this specific model has been superseded by the combination-type THQB1120AF2.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB1120AF |
| Series | THQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series Panelboards, GE AQ Lighting Panels, ReliaGear RQ 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 Thermal, Fixed Magnetic |
| Special Classification | AFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release, Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 1699, UL 489, NEMA AB 1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Arc Fault (Branch/Feeder), HACR Rated, SWD Rated, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
6 answersCan I install the THQB1120AF in a standard residential GE Powermark load center?
No. The THQB1120AF is a bolt-on circuit breaker designed for commercial and industrial panelboards, such as GE A-Series, AQ Lighting Panels, and ReliaGear RQ enclosures. Standard residential GE Powermark load centers require plug-on THQL or THQP breakers.
What is the difference between the THQB1120AF and the THQB1120AF2?
The THQB1120AF provides branch and feeder arc fault mitigation, which meets older NEC requirements. The newer THQB1120AF2 is a combination arc fault circuit interrupter that detects both parallel and series arcs to comply with modern electrical codes.
How is the neutral connection wired on this AFCI breaker?
This breaker features a pigtail neutral wire. During installation, the pigtail must be connected directly to the panel neutral bus bar to power the internal arc fault detection circuitry.
Are THQB and THHQB arc fault breakers interchangeable?
They share the same physical dimensions and bolt-on mounting, but they have different interrupting ratings. The THQB1120AF is rated for 10kAIC, while the THHQB equivalent is rated for 22kAIC. You must verify your panel and system fault current requirements before substituting.
Does this breaker provide ground fault protection?
No. The THQB1120AF is strictly an Arc Fault Circuit Interrupter designed to detect dangerous arcing conditions. If your circuit requires personnel ground fault protection, you will need a dual-function breaker or a separate GFCI receptacle at the point of use.
What wire sizes and materials are compatible with the THQB1120AF terminals?
The box lugs are rated for both copper and aluminum conductors. You can use 14 to 8 AWG copper wire or 12 to 8 AWG aluminum wire, making it suitable for standard 20-amp branch circuit wiring in commercial environments.
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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.