ABB / General ElectricTHQB21100ST1
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ABB / General Electric THQB21100 Miniature Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB21100
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB21100
Quantity
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ABB / General Electric THQB21100 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB21100 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB21100 |
| Series | THQB |
| Amperage | 100A |
| 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 | 6-1/0 AWG (Cu), 4-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Sold out
Quantity
ABB / General Electric THQB21100 - 100A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB21100-R |
| Series | THQB |
| Amperage | 100A |
| 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 | 6-1/0 AWG (Cu), 4-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
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Description
Rated at 10kAIC, the GE THQB21100 handles demanding commercial and industrial electrical loads. This 2-pole, 100-amp miniature circuit breaker provides dependable thermal-magnetic protection for 120/240VAC branch circuits, utilizing a quick-make/quick-break mechanism to ensure consistent operation. The breaker installs into GE A-Series panelboards and AQ lighting panels. Its bolt-on mounting style creates a secure, vibration-resistant connection to the panel bus. The unit is HACR rated.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB21100 |
| Series | THQB |
| Amperage | 100A |
| 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 | 6-1/0 AWG (Cu), 4-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
6 answersIs the ABB THQB21100 the same breaker as the GE THQB21100?
Yes. Following ABB's acquisition of GE Industrial Solutions, the Q-Line circuit breaker family is now manufactured by ABB. The THQB21100 catalog number, physical dimensions, and electrical specifications remain identical regardless of whether the breaker carries the GE or ABB brand label.
What is the difference between the GE THQB21100 and a THQL21100 circuit breaker?
The THQB21100 features a bolt-on mounting style designed specifically for commercial A-Series panelboards and AQ lighting panels. The THQL series uses a plug-in connection designed for standard residential GE load centers. Because of the distinct mounting designs, these breakers are not interchangeable.
What panelboards are compatible with the THQB21100?
This 100A bolt-on breaker is authorized for use in General Electric A-Series panelboards and GE AQ Lighting Panels. It cannot be installed in GE PowerMark Gold load centers, which require plug-in style breakers.
How is a bolt-on breaker like the THQB21100 installed into the panelboard?
Unlike plug-in breakers that snap onto the bus bar, the THQB21100 is mechanically fastened directly to the panelboard bus using mounting screws. This bolt-on connection provides a secure, highly vibration-resistant contact that is standard for commercial and industrial electrical distribution.
What wire sizes are accepted by the terminal lugs on the THQB21100?
The integrated box lugs accept 6 AWG to 1/0 AWG copper (Cu) wire, or 4 AWG to 1/0 AWG aluminum (Al) wire. Always verify the manufacturer torque specifications printed on the side of the breaker before securing the conductors.
How does the thermal magnetic trip unit operate on this breaker?
This breaker utilizes a fixed Long-Time and Instantaneous (LI) trip function. The Long-Time thermal element protects against sustained overloads by heating a bimetallic strip, while the Instantaneous magnetic element responds immediately to severe short circuits using an internal electromagnet.
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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.