ABB / General ElectricTHQB2190ST1
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ABB / General Electric THQB21100ST1 Miniature Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB21100ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB21100ST1
Quantity
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ABB / General Electric THQB21100ST1 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB21100ST1 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB21100ST1 |
| 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 | Auxiliary Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Sold out
Quantity
ABB / General Electric THQB21100ST1 - 100A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB21100ST1-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 | Auxiliary Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
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Description
Engineered for commercial and industrial power distribution, this 100-amp breaker provides robust thermal-magnetic overcurrent protection. It bolts into GE A-Series panelboards and AQ lighting panels to ensure a stable, vibration-resistant connection. An integrated 120VAC shunt trip allows facility managers to remotely open the circuit when needed. This Q-Line breaker features a 10kAIC rating and a quick-make, quick-break mechanism.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB21100ST1 |
| 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 | Auxiliary Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
7 answersWhich panelboards are compatible with the THQB21100ST1 breaker?
This bolt-on breaker is specifically designed for installation in GE A-Series panelboards and GE AQ lighting panels.
What does the ST1 suffix mean on this GE circuit breaker?
The ST1 designation indicates that the breaker is equipped with a factory-installed 120VAC shunt trip. This allows facility managers or automated systems to remotely open the circuit for emergency shutdowns or load shedding.
How is the integrated shunt trip wired and activated?
The shunt trip accessory requires a dedicated 120VAC control circuit. Applying voltage to the shunt trip circuit via a remote normally open contact, such as an emergency stop button or relay, will mechanically trip the breaker.
Can I substitute a THQL breaker for the THQB21100ST1?
No. While both are Q-Line breakers, the THQL series uses a plug-in connection. The THQB series requires a bolt-on connection to secure directly to the panel bus, making them non-interchangeable.
How does the breaker indicate that it has tripped?
Like other GE Q-Line breakers, it features a quick-make, quick-break mechanism with a common trip bar. When a fault is detected, the handle moves to a center position for easy visual identification of a tripped circuit.
Can this two-pole breaker be used in a three-phase panelboard?
Yes. It can be bolted into a three-phase GE A-Series panelboard, where it will connect to two of the three bus bars to supply a single-phase 240VAC load.
Why is this breaker listed under both ABB and General Electric?
ABB acquired GE Industrial Solutions in 2018. As a result, GE-branded breakers like the THQB series are now manufactured and distributed under the ABB brand, though they retain the exact same form, fit, and function for legacy GE panels.
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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.
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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.