ABB / General ElectricTHQB1120GFT
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ABB / General Electric THQB1120GF GFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
ABB / General Electric
THQB1120GF
GFCI Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB1120GF
Quantity
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ABB / General Electric THQB1120GF - 20A GFCI Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB1120GF - 20A GFCI Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB1120GF |
| Series | THQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series 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 | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Special Classification | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Padlock Attachment |
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Non-Interchangeable Trip, Quick-Make/Quick-Break, Self-Test |
Sold out
Quantity
ABB / General Electric THQB1120GF - 20A GFCI Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB1120GF-R |
| Series | THQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series 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 | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Special Classification | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Padlock Attachment |
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Non-Interchangeable Trip, Quick-Make/Quick-Break, Self-Test |
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Description
Rated for 20 amps at 120V, this 1-pole GFCI breaker combines thermal-magnetic trip technology with 5mA Class A ground-fault detection. It is engineered for commercial and industrial environments requiring strict adherence to NEC safety codes for wet locations. This unit bolts into GE A-Series panelboards, utilizing box lug terminals that accept 14-8 AWG copper or 12-8 AWG aluminum wiring. The breaker delivers a 10kAIC interrupting capacity and is SWD rated for fluorescent lighting loads.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB1120GF |
| Series | THQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series 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 | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Special Classification | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Padlock Attachment |
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Non-Interchangeable Trip, Quick-Make/Quick-Break, Self-Test |
Product FAQs
7 answersWhich panelboards are compatible with the THQB1120GF breaker?
This breaker is designed to fit GE A-Series panelboards, including AQ, AE, and AD lighting panels that accept bolt-on Q-Line circuit breakers.
Are THQB and THQL circuit breakers interchangeable in the same panel?
No, they are not interchangeable. While both belong to the GE Q-Line family, THQB breakers feature a bolt-on mounting style for commercial panels, whereas THQL breakers use a plug-on connection typically found in residential load centers.
What is the ground fault trip threshold for the THQB1120GF?
This breaker provides Class A personnel protection with a 5mA ground fault trip threshold. It is designed to interrupt the circuit quickly if current leakage reaches this level to protect users from electrical shock.
Does this GFCI breaker require a dedicated neutral connection?
Yes, it includes a built-in pigtail neutral wire that must be securely connected to the neutral bar in your panel for the ground fault detection circuitry to function properly.
How does a bolt-on breaker like the THQB1120GF secure to the panel?
It mounts directly to the panel bus bar using a screw. This bolted connection provides a secure, vibration-proof contact that is preferred in commercial and industrial applications.
Why is this THQB breaker listed as both ABB and General Electric?
ABB acquired GE Industrial Solutions. As a result, THQB Q-Line circuit breakers may feature either the ABB or General Electric brand name on the label, but they are the exact same component and fully compatible.
How often should I test the ground fault function on this breaker?
It is recommended to test the GFCI function monthly using the integrated test button. Pushing this button simulates a ground fault and should immediately trip the breaker, confirming the safety mechanism is working.
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Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
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All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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.