ABB / General ElectricTHQB2120ST1
ABB THQBB5DAAMAXXXX THQB2120 - 20A 2 Pole Miniature Circuit Breaker
- 20A
- 2 Pole
- Bolt-On
ABB
THQBB5DAAMAXXXX
THQB2120 - 20A 2 Pole Miniature Circuit Breaker
Brand
ABB
SKU
THQBB5DAAMAXXXX
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ABB THQB2120 - 20A 2 Pole Miniature Circuit Breaker
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Description
Engineered for commercial applications, the ABB THQBB5DAAMAXXXX is a 2-pole, 20A miniature circuit breaker from the Q-Line family. It provides reliable thermal-magnetic protection for circuits requiring remote tripping capabilities. This unit mounts into ABB and GE AQ lighting panels or ReliaGear panelboards. It serves as a drop-in replacement for the legacy GE THQB2120ST1. Rated 10kAIC at 120/240VAC, it features a factory-installed 120VAC shunt trip and a HACR rating for HVAC use.Specifications
| Brand | ABB |
|---|---|
| Series | THQB |
| Amperage | 20A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | ABB/GE AQ Lighting Panels, ReliaGear 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 | Shunt Trip, Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | HACR, UL 489 |
| Approval | cULus, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Product FAQs
6 answersWhich panelboards are compatible with the THQB2120 circuit breaker?
This bolt-on breaker is designed for use in ABB and legacy GE Q-Line panelboards, including AQ Lighting Panels and ReliaGear Panelboards. It is not compatible with load centers that require plug-in style breakers.
Is the THQBB5DAAMAXXXX the same as the THQB2120?
THQBB5DAAMAXXXX is an internal ABB catalog number associated with this 20A, 2-pole bolt-on circuit breaker. It serves as a direct replacement for legacy GE THQB2120 models.
What wire sizes are accepted by the lugs on this breaker?
The box lugs accept 14 to 8 AWG copper conductors or 12 to 8 AWG aluminum conductors. While a 20A circuit is typically paired with 12 AWG copper wire, always verify your specific application against local electrical codes.
Is the THQB2120 suitable for HVAC applications?
Yes, this breaker is HACR rated, making it approved for use with heating, air conditioning, and refrigeration equipment that requires a 20A, 2-pole circuit.
Does this 2-pole breaker feature a common trip mechanism?
Yes, it includes an internal common trip bar. If an overload or short circuit occurs on either pole, both poles will disconnect simultaneously to prevent single-phasing and ensure system safety.
How much panel space does this 2-pole breaker occupy?
Q-Line miniature circuit breakers are 1 inch wide per pole. This 2-pole device requires 2 inches of mounting space on the panelboard bus.
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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.