ABB / General Electric THQB1120GFT GFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
ABB / General Electric THQB1120GFT - 20A GFCI Miniature Circuit Breaker
New
Quantity
Description
Built for commercial and industrial safety, the THQB1120GFT features an automatic self-test function to ensure continuous 5mA ground fault protection. This 20A, 1-pole breaker mounts into GE A-Series panelboards and AQ lighting panels via a secure bolt-on connection. It serves as the direct, upgraded replacement for the older THQB1120GF model. The unit includes a pigtail neutral and is HACR and SWD rated, meeting strict NEC requirements for wet or damp locations.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB1120GFT |
| 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 | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Padlock Attachment |
| Accessories | Load Side Lugs Included, Pigtail Neutral |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Class A Ground Fault Protection (5mA), Self-Test, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Product FAQs
8 answersIs the THQB1120GFT a direct replacement for the older THQB1120GF breaker?
Yes. The THQB1120GFT is the direct manufacturer upgrade for the discontinued THQB1120GF, featuring an added automatic self-test function to meet updated UL 943 safety standards.
Can I install this bolt-on breaker in a GE Powermark Gold residential load center?
No. Powermark load centers require THQL series plug-on breakers. The THQB1120GFT is a bolt-on breaker designed strictly for GE A-Series panelboards and AQ lighting panels.
What is the ground-fault trip threshold for this breaker?
This breaker provides Class A personnel protection with a 5mA ground-fault trip threshold. It is not an Equipment Protection Device (EPD), which would typically feature a 30mA threshold.
How do I wire the neutral connection for this GFCI breaker?
You must connect the coiled white pigtail wire directly to the neutral bus bar in the panelboard. The neutral wire from your dedicated 120V branch circuit must then be terminated at the designated load neutral lug on the breaker itself.
Can I use this GFCI breaker for switching 120V fluorescent lighting loads?
Yes. GE THQB series 15A and 20A single-pole breakers are SWD (Switching Duty) rated, meaning they can be safely used as switches for standard fluorescent lighting circuits.
Does this breaker come with the necessary bolt-on hardware?
Yes, it includes the captive mounting screw required to securely bolt the breaker terminal to the panelboard bus.
What does the self-test feature on this GFCI breaker do?
The self-test function automatically performs routine internal diagnostics to ensure the ground-fault detection circuitry remains functional. This provides continuous personnel protection without relying solely on manual push-button testing.
Is the THQB1120GFT suitable for heating, air conditioning, and refrigeration equipment?
Yes. Like most GE Q-Line miniature circuit breakers, this model is HACR rated, making it suitable for protecting branch circuits that supply motorized HVAC equipment.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 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.