ABB / General ElectricTHQB32045ST1
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ABB / General Electric THQB32040ST1 Miniature Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
ABB / General Electric
THQB32040ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB32040ST1
Quantity
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ABB / General Electric THQB32040ST1 - 40A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB32040ST1 - 40A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32040ST1 |
| Series | THQB |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Sold out
Quantity
ABB / General Electric THQB32040ST1 - 40A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32040ST1-R |
| Series | THQB |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
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Description
Engineered for commercial and industrial power distribution, this 40-amp Q-Line miniature circuit breaker features a factory-installed 120VAC shunt trip mechanism. This allows facility managers to remotely open the circuit for emergency shutdowns or automated control sequences. It installs into GE A-Series panelboards using a secure bolt-on connection. The thermal-magnetic trip unit provides reliable overload and short-circuit protection with a 10kAIC rating at 240VAC.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32040ST1 |
| Series | THQB |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Product FAQs
6 answersWhich panelboards are compatible with the THQB32040ST1 breaker?
This 3-pole bolt-on breaker is designed for use in General Electric A-Series panelboards, AQ lighting panels, and ABB ReliaGear RQ panelboards. It is not compatible with standard plug-on style residential load centers.
What does the "ST1" suffix indicate on this catalog number?
The "ST1" suffix signifies that this unit is equipped with a factory-installed 120VAC shunt trip accessory. This allows the circuit breaker to be tripped remotely via an external 120V control signal, which is frequently required for fire alarm integration or emergency shut-off switches.
How is this Q-Line breaker mounted into the electrical panel?
The THQB32040ST1 features a bolt-on connection design. The line-side terminals must be mechanically bolted directly to the panelboard's busbars, providing a secure, vibration-resistant electrical connection that is standard in commercial enclosures.
Can I field-adjust the trip settings on this 40-amp breaker?
No. The internal trip mechanism is non-interchangeable and features fixed thermal and fixed magnetic (LI) elements. The long-time overload and instantaneous short-circuit response thresholds are pre-calibrated at the factory.
What are the accepted wire sizes for the load-side lugs?
The integral box lugs on this breaker are dual-rated for both copper (Cu) and aluminum (Al) conductors, and they are designed to accept wire sizes ranging from 8 AWG up to 3 AWG.
Can I use the THQB32040ST1 to replace a THHQB series breaker?
While it shares the same physical Q-Line frame and bolt-on mounting style, the THQB32040ST1 is only rated for 10kAIC at 240VAC. It cannot be used as a replacement if your electrical system's available fault current requires the higher 22kAIC interrupting rating provided by THHQB models.
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Shipping
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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We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
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Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
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All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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.