ABB / General Electric THHQB1120AF AFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
ABB / General Electric THHQB1120AF - 20A AFCI Miniature Circuit Breaker
New
Quantity
Description
Built to handle 20-amp commercial loads, this branch/feeder AFCI detects parallel arcing conditions before they can cause electrical fires. The breaker installs securely into GE A-Series and ReliaGear panelboards via a standard bolt-on connection. Delivering a robust 22kAIC interrupting capacity, it ensures reliable thermal-magnetic protection. While highly effective for legacy installations, modern NEC codes often require the upgraded THHQB1120AF2 combination AFCI for new residential circuits.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THHQB1120AF |
| Series | THHQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series Panelboards, ReliaGear Panelboards |
| Wire Gauge | 14-10 AWG (Cu), 14-10 AWG (Al) |
| Max Wire | 10 AWG |
| Min Wire | 14 AWG |
| 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, Padlock Attachment |
| Accessories | Arc Fault Circuit Interrupter |
| Standards | CSA C22.2 No. 5, UL 1699, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
8 answersWhich panelboards are compatible with the THHQB1120AF circuit breaker?
This bolt-on breaker is designed for use in GE A-Series panelboards, ReliaGear panelboards, and AQ lighting panels.
What is the difference between GE THQB1120AF and THHQB1120AF?
The primary difference is the interrupting rating. The THQB1120AF is rated at 10kAIC, while the THHQB1120AF has a higher interrupting capacity of 22kAIC. Both share the same physical dimensions and bolt-on mounting style.
What type of arc fault protection does the THHQB1120AF provide?
The THHQB1120AF is a Branch/Feeder Arc Fault Circuit Interrupter (AFCI). It is designed to detect unintended electrical arcs in branch and feeder wiring to help prevent electrical fires. It is not a Combination AFCI.
How is the neutral connection wired on this AFCI breaker?
This breaker features a pigtail neutral connection. The coiled white pigtail wire must be connected directly to the panelboard neutral bus bar for the arc fault circuitry to function correctly.
What is the recommended terminal torque for the box lugs on this breaker?
The terminal screws on the THHQB1120AF should be torqued to 20 in-lb. Always verify with the manufacturer labeling or instructions prior to installation.
Can this breaker be used with aluminum wiring?
Yes, the box lugs are rated for both copper (Cu) and aluminum (Al) conductors. It accepts wire gauges from 14 AWG to 10 AWG.
Does this breaker mount by plugging in or bolting on?
The THHQB1120AF is a bolt-on circuit breaker. It must be securely bolted to the bus connections in compatible GE load centers or lighting panels, unlike plug-on Q-Line breakers.
Can I use a THQP breaker in place of this THHQB breaker?
No. THQP breakers are half-inch plug-on breakers, whereas the THHQB1120AF is a one-inch wide bolt-on breaker. They mount differently and are not interchangeable.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
- JLJames L. L.Verified BuyerReviewingABB / General Electric THHQB21100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/6/26ABB / General Electric THHQB21100
Fast Service and delivery, The breaker was as described and brand new! Great pricing and great Service. I paid extra for UPS ground, it was delivered quickly.
- SNScott N.Verified BuyerReviewingABB / General Electric THHQB32030 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/30/25Perfect
The correct breaker the first time - every time.
- AGAlejandra G.Verified BuyerReviewingABB / General Electric THHQB1140 - 40A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Everithing is good!
Everithing is good!
- LMLuis M.ReviewingABB / General Electric THHQB2145 - 45A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/19/23Good product and good service
Good product and good service
- SHScott H.ReviewingABB / General Electric THHQB2180 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/21/2280amp commercial breaker
Great how easy it was to order and how fast I got it. I will order one again when needed