ABB / General ElectricTHHQB1120GFT
ABB / General Electric THHQB1120GF GFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
ABB / General Electric
THHQB1120GF
GFCI Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THHQB1120GF
Quantity
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ABB / General Electric THHQB1120GF - 20A GFCI Miniature Circuit Breaker
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Description
Designed for commercial lighting applications, this 20-amp miniature circuit breaker delivers reliable 5mA Class A personnel protection. It mounts into GE A-Series and ReliaGear lighting panelboards via a secure bolt-on connection. While eventually replaced by the self-testing THHQB1120GFT, this exact match unit maintains a robust 22kAIC interrupting rating at 120VAC. The thermal-magnetic trip mechanism ensures consistent defense against overloads, short circuits, and ground faults.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THHQB1120GF |
| Series | THHQB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series Panelboards, ReliaGear Lighting 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 | Padlock Attachment |
| Accessories | Ground Fault Protection (Factory Installed) |
| Standards | CSA C22.2 No. 5, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
6 answersWhat panelboards are compatible with the THHQB1120GF?
This bolt-on Q-Line breaker is designed for use in GE A-Series and ReliaGear lighting panelboards. It is not compatible with standard residential plug-on load centers like PowerMark Gold.
What is the difference between the THHQB1120GF and the THQB1120GF?
The primary difference is the interrupting rating. The THHQB1120GF has a 22kAIC rating, while the THQB1120GF has a standard 10kAIC rating. Both are 20A, 1-pole, bolt-on GFCI breakers.
What level of ground fault protection does this breaker provide?
The THHQB1120GF is a Class A Ground Fault Circuit Interrupter (GFCI), meaning it is designed to trip when a ground fault of 4 to 6 milliamps (mA) is detected, providing personnel protection.
How is the neutral connection made for this GFCI breaker?
This breaker features a pigtail neutral wire that must be connected directly to the panelboard neutral bus bar to ensure proper ground fault detection.
Is the THHQB1120GF suitable for high fault current applications?
Yes, as part of the high-interrupting THHQB series, this breaker provides a 22kAIC rating at 120V. This is required in many commercial and industrial environments where standard 10kAIC breakers are insufficient.
Is there a self-testing version of this breaker available?
Yes, the THHQB1120GFT is the newer, self-testing equivalent of this breaker. It performs routine internal diagnostics to ensure the ground fault protection remains active.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
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Rating
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