ABB / General ElectricTHQB2150ST1
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ABB / General Electric THQB2140ST1 Miniature Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB2140ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB2140ST1
Quantity
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ABB / General Electric THQB2140ST1 - 40A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB2140ST1 - 40A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB2140ST1 |
| Series | THQB |
| Amperage | 40A |
| 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, ReliaGear RQ Panelboards |
| Wire Gauge | 8-3 AWG (Cu/Al) |
| Max Wire | 3 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| 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 THQB2140ST1 - 40A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB2140ST1-R |
| Series | THQB |
| Amperage | 40A |
| 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, ReliaGear RQ Panelboards |
| Wire Gauge | 8-3 AWG (Cu/Al) |
| Max Wire | 3 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| 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
Designed for advanced control applications, this 40A miniature circuit breaker combines standard thermal-magnetic protection with remote tripping capabilities. The bolt-on form factor mounts into GE A-Series, AQ lighting, and ReliaGear RQ panelboards, ensuring a rigid and dependable electrical connection. A factory-installed 120/240VAC shunt trip accessory enables automated shutdown from remote switches or emergency stop buttons, complementing its 10kAIC rating.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB2140ST1 |
| Series | THQB |
| Amperage | 40A |
| 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, ReliaGear RQ Panelboards |
| Wire Gauge | 8-3 AWG (Cu/Al) |
| Max Wire | 3 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| 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
6 answersWhat does the ST1 suffix indicate on the THQB2140ST1 circuit breaker?
The ST1 designation means this breaker includes a factory-installed 120VAC shunt trip accessory. This allows the breaker to be tripped remotely via an external signal, such as an emergency stop button or automated control system.
Can I install the THQB2140ST1 in a standard residential load center?
No. The THQB2140ST1 is a bolt-on breaker designed specifically for commercial and industrial panelboards, such as GE A-Series, GE AQ Lighting Panels, and ABB ReliaGear RQ panelboards. Standard residential load centers typically require plug-on breakers like the THQL series.
How does the bolt-on connection of the THQB2140ST1 benefit industrial applications?
The breaker physically bolts directly to the panelboard bus. This provides a highly secure and rigid electrical connection that resists loosening over time, making it ideal for commercial and industrial environments subject to vibration or heavy use.
What type of protection does the thermal-magnetic trip unit provide?
The THQB2140ST1 features Long-Time and Instantaneous (LI) trip functions. The thermal element provides long-time protection against sustained overloads, while the magnetic element offers instantaneous protection against severe short circuits.
Why might this breaker arrive with either ABB or GE branding?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, the THQB2140ST1 may feature either ABB or General Electric labeling, but the physical dimensions, fit, and technical specifications remain identical.
Can the shunt trip accessory on the THQB2140ST1 be field-installed?
No, the ST1 shunt trip mechanism is factory-installed internally alongside the common trip mechanism. It cannot be added, removed, or modified in the field.
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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.