ABB / General ElectricTHQL2130ST1
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ABB / General Electric THQL2120ST1 Miniature Circuit Breaker
- 20A
- 2 Pole
- Plug-On
ABB / General Electric
THQL2120ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQL2120ST1
Quantity
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ABB / General Electric THQL2120ST1 - 20A 2 Pole Miniature Circuit Breaker
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Description
Built for commercial and industrial applications, the THQL2120ST1 features an integrated 120VAC shunt trip for remote disconnect capabilities. This 2-pole, 20A miniature circuit breaker provides reliable thermal-magnetic protection with a 10kAIC rating at 120/240VAC. It mounts into GE Q-Line load centers and A-Series panelboards using a standard 1-inch per pole plug-on design. The unit includes box lug terminals, an internal common trip mechanism, and is fully HACR rated for HVAC equipment.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQL2120ST1 |
| Series | THQL |
| Amperage | 20A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | THQL |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE Q-Line Load Centers, 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 Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 60C to 75C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break |
Product FAQs
8 answersWhat does the ST1 suffix indicate on the THQL2120ST1 part number?
The ST1 suffix designates a factory-installed 120VAC shunt trip. This allows the breaker to be tripped remotely via a 120V control signal for emergency shutdowns or automated control applications.
Will my THQL2120ST1 breaker be branded as GE or ABB?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, your breaker may feature either GE or ABB branding. The form, fit, function, and UL listings remain identical regardless of the label.
Is the THQL2120ST1 compatible with bolt-on panelboards?
No, the THQL2120ST1 features a plug-in connection designed for GE Q-Line load centers and plug-on A-Series panelboards. If your panel requires a bolt-on connection, you will need the equivalent THQB2120ST1 breaker.
Is the THQL2120ST1 rated for HVAC equipment?
Yes, GE THQL series breakers are HACR rated. This makes the THQL2120ST1 suitable for protecting heating, air conditioning, and refrigeration equipment that requires a 20A, 2-pole circuit.
How does the shunt trip function operate on the THQL2120ST1?
The internal shunt trip mechanism requires a separate 120VAC control signal. When 120V is applied to the shunt trip circuit, it mechanically trips the breaker to open the primary contacts.
Can I add a shunt trip to a standard THQL2120 breaker in the field?
No, the 120VAC shunt trip on the THQL2120ST1 is factory-installed. GE Q-Line miniature circuit breakers do not support field-installable shunt trip accessories, so you must order the ST1 version if remote tripping is required.
Does the THQL2120ST1 provide ground fault or arc fault protection?
No, this is a standard thermal-magnetic circuit breaker that provides long-time overload and instantaneous short-circuit protection. It does not include GFCI, AFCI, or dual-function capabilities.
Are the trip settings adjustable on the THQL2120ST1?
No, this breaker features a fixed thermal-magnetic trip unit. Both the long-time overload and instantaneous short-circuit trip functions are factory set and cannot be adjusted.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 90 reviews.
Total 5 star reviews: 88 Total 4 star reviews: 1 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 0
Reviews Summary
Generated by AI from 78 most recent customer reviews
Last updated 8/5/25
Customers say these circuit breakers arrive quickly and fit their electrical panels perfectly. Many reviews mention competitive pricing compared to local suppliers. Frequent comments address the secure packaging and prompt delivery. Reviews highlight the exact match to specifications and ease of installation. The selection receives particular praise, especially for hard-to-find models.
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Rating
90 reviews
- KLKim L.Verified BuyerReviewingABB / General Electric THQL2130 - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/6/26Circuit Breaker
Thank you for your fast efficient service! We had a power outage and several power surges that took out our breaker. Fast easy inexpensive repair!!
- RHRussell H.Verified BuyerReviewingABB / General Electric THQL1120GF - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/20/26Hard To Find
Had an old breaker that was hard to find but they had it and at a reasonable price!
- JBJeff B.Verified BuyerReviewingABB / General Electric THQL32030 - 30A 3 Pole Miniature Circuit BreakerRated 3 out of 5 stars7/14/26No paperwork
Part arrived, would have been nice to receive a packing slip or something in the box beside the part.
- SNScott N.Verified BuyerReviewingABB / General Electric THQL32100 - 100A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/26/26Owner
Worked great, breaker was the exact match
- JDJerry D.Verified BuyerReviewingABB / General Electric THQL32050 - 50A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/19/26Best place to get great prices on 3pole breakers
i have bought from super breakers before & when i need these for a job i know they will be great. i buy to restock my truck.