ABB / General ElectricTHQB2120ST1
ABB / General Electric THQB2115ST1 Miniature Circuit Breaker
- 15A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB2115ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB2115ST1
Quantity
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ABB / General Electric THQB2115ST1 - 15A 2 Pole Miniature Circuit Breaker
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Description
Featuring a factory-installed 120VAC shunt trip mechanism, this 15-amp two-pole breaker allows facility managers to open circuits from a remote location. It fastens securely into GE A-Series panelboards using standard bolt-on connections for commercial and industrial applications. The thermal-magnetic design provides reliable long-time and instantaneous protection with a 10kAIC rating at 120/240VAC. It also includes a common trip function and carries a standard HACR certification.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THQB |
| Amperage | 15A |
| Poles | 2 |
| 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 |
| 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 |
| Available Options | Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Quick-Make/Quick-Break, Common Trip |
Product FAQs
7 answersWhat does the ST1 suffix indicate on the THQB2115ST1 breaker?
The ST1 suffix indicates that this breaker includes a factory-installed 120VAC shunt trip mechanism. This allows the breaker to be tripped remotely via an external control signal, which is commonly used for emergency shutdowns or automated safety systems.
How many panel spaces does the THQB2115ST1 require?
Although it is a 2-pole breaker, the factory-installed shunt trip requires an additional pole space. Therefore, the THQB2115ST1 requires three standard 1-inch panel spaces in your GE A-Series panelboard or AQ lighting panel.
What voltage is required to operate the shunt trip on the THQB2115ST1?
The factory-installed shunt trip on the THQB2115ST1 requires a 120VAC control signal to operate and remotely open the breaker contacts.
Can I install the THQB2115ST1 in a standard GE residential load center?
No. The THQB2115ST1 is a bolt-on breaker designed specifically for commercial panelboards, such as the GE A-Series. It will not fit in standard residential GE PowerMark load centers, which require plug-in style THQL breakers.
Can I add a shunt trip to a standard THQB2115 breaker in the field?
No, the shunt trip mechanism on the THQB2115ST1 is factory-installed and cannot be added in the field. If your application requires remote tripping capabilities, you must purchase a breaker with the ST1 suffix already integrated.
What is the difference between the THQB2115ST1 and THHQB2115ST1?
The THQB2115ST1 has a standard interrupting rating of 10kAIC at 120/240VAC. The THHQB version is the high-interrupting model, which raises the short-circuit rating to 22kAIC. Both versions feature the same bolt-on mounting and 120VAC shunt trip.
Will I receive an ABB or General Electric branded breaker?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, the THQB2115ST1 may be branded as either ABB or General Electric. The form, fit, function, and catalog numbers remain identical regardless of the label.
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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.