ABB / General ElectricTHQB2130ST1
ABB / General Electric THQB2125ST1 Miniature Circuit Breaker
- 25A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB2125ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB2125ST1
Quantity
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ABB / General Electric THQB2125ST1 - 25A 2 Pole Miniature Circuit Breaker
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Description
Built for commercial applications, the THQB2125ST1 is a 2-pole, 25A miniature circuit breaker equipped with a factory-installed shunt trip for remote tripping capabilities. The unit features a bolt-on mounting style, making it fully compatible with GE A-Series panelboards and AQ lighting panels. It accommodates 14-8 AWG copper or 12-8 AWG aluminum wiring. Rated for 10kAIC at 120/240VAC, this Q-Line breaker provides dependable thermal-magnetic protection and is HACR rated for HVACR use.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THQB |
| Amperage | 25A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| 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 | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Product FAQs
8 answersWhat panelboards accept the THQB2125ST1?
This bolt-on Q-Line breaker is designed specifically for GE A-Series panelboards and GE AQ lighting panels. It will not fit in standard residential load centers that require plug-in THQL breakers.
What does the ST1 suffix mean on this GE circuit breaker?
The ST1 suffix indicates the breaker is equipped with a factory-installed 120V AC shunt trip. This allows the breaker to be opened remotely via an external control signal for emergency shutdowns or automated safety systems.
How does the THQB2125ST1 connect to the panel bus?
It features a bolt-on connection, meaning it fastens directly to the panelboard bus bar with screws. This provides a rigid, vibration-resistant mechanical connection suitable for commercial and industrial environments.
What wire gauges are compatible with the box lugs on this breaker?
The load side terminals accept 14 AWG to 8 AWG copper conductors, or 12 AWG to 8 AWG aluminum conductors.
How does the shunt trip function operate on the THQB2125ST1?
The internal shunt trip mechanism requires a 120V AC external voltage signal to actuate. When the signal is applied, it mechanically trips the breaker to open the circuit, providing a reliable method for remote power disconnection.
Will I receive an ABB or GE branded breaker when ordering the THQB2125ST1?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, the breaker may carry either the GE or ABB logo, but the THQB2125ST1 catalog number, form factor, and UL listings remain exactly the same.
What type of overcurrent protection does this breaker provide?
It uses a fixed thermal-magnetic trip unit with Long-Time and Instantaneous (LI) functions. The thermal element responds to sustained overloads, while the magnetic element reacts immediately to short circuits.
Can the THQB2125ST1 replace a standard THQB2125?
It shares the same 25A rating, 2-pole configuration, and bolt-on mounting as the standard THQB2125, but includes a 120V shunt trip. It is typically used only when remote tripping capabilities are required by the system design.
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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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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.