ABB / General ElectricTHQB2130ST1
Free Shipping Over $99
ABB / General Electric THQB2120ST1 Miniature Circuit Breaker
- 20A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB2120ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB2120ST1
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
ABB / General Electric THQB2120ST1 - 20A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB2120ST1 - 20A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB2120ST1 |
| Series | THQB |
| Amperage | 20A |
| 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, 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 Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip, Reverse Feed |
Quantity
ABB / General Electric THQB2120ST1 - 20A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB2120ST1-R |
| Series | THQB |
| Amperage | 20A |
| 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, 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 Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip, Reverse Feed |
Similar Items
ABB / General ElectricTHQB2140ST1
40A 2 Pole Miniature Circuit Breaker
ABB / General ElectricTHQB2150ST1
50A 2 Pole Miniature Circuit Breaker
ABB / General ElectricTHQB2160ST1
60A 2 Pole Miniature Circuit Breaker
Description
Built for commercial and industrial environments, the THQB2120ST1 delivers robust overcurrent protection with the added functionality of a factory-installed shunt trip. This allows for remote tripping of the circuit, which is essential for emergency shutdowns and automated control systems. It mounts securely into GE A-Series panelboards and AQ lighting panels. Rated at 10 kAIC at 120/240VAC, this two-pole breaker features a quick-make, quick-break mechanism and an internal common trip.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB2120ST1 |
| Series | THQB |
| Amperage | 20A |
| 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, 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 Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip, Reverse Feed |
Product FAQs
8 answersWhat does the ST1 suffix indicate on the THQB2120ST1 breaker?
The ST1 suffix indicates that this breaker includes a factory-installed 120VAC shunt trip. This allows the circuit breaker to be opened remotely for emergency power cutoff.
Can I install this breaker in a standard GE residential load center?
No. The THQB2120ST1 is a bolt-on breaker intended for commercial GE A-Series panelboards and AQ lighting panels. Standard GE residential load centers require plug-in THQL style breakers.
What is the difference between GE THQB and THQL circuit breakers?
THQB breakers, like the THQB2120ST1, are bolt-on devices used primarily in commercial lighting panels and panelboards. THQL breakers are plug-in devices designed for residential load centers. They are not interchangeable.
How does this breaker connect to the panel bus?
The THQB2120ST1 features a bolt-on mounting style. It secures directly to the panelboard bus with screws, ensuring a reliable mechanical and electrical connection in commercial applications compared to plug-in alternatives.
Can I use this breaker in systems requiring a 22kAIC short-circuit rating?
No. The THQB2120ST1 has a maximum interrupting rating of 10kAIC at 120/240VAC. You will need to specify a breaker with a higher interrupting rating for systems with elevated available fault currents.
What trip technology does the THQB2120ST1 use?
This breaker utilizes a thermal magnetic trip unit with fixed long-time and instantaneous trip functions. The thermal element protects against gradual overloads, while the magnetic element trips instantly during severe short circuits.
Can I replace an older ABB THQB2120ST1 with a General Electric branded one?
Yes. ABB and General Electric THQB breakers are the exact same product manufactured to identical specifications, which is why they share the same catalog numbers.
How does the shunt trip function improve safety?
The factory-installed ST1 shunt trip allows auxiliary safety systems, emergency stop buttons, or fire alarms to remotely trigger the breaker to open. This cuts power to the circuit immediately during an emergency event.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
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.
Same Day Shipping
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.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
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.
Search
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.