ABB / General ElectricTHQB32050ST1
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ABB / General Electric THQB32045ST1 Miniature Circuit Breaker
- 45A
- 3 Pole
- Bolt-On
ABB / General Electric
THQB32045ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB32045ST1
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ABB / General Electric THQB32045ST1 - 45A 3 Pole Miniature Circuit Breaker
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Description
Built for three-phase commercial applications, this 45A breaker provides dependable overcurrent protection. It is equipped with a factory-installed shunt trip, enabling remote disconnection for enhanced facility safety. The unit installs securely into GE A-Series panelboards using a robust bolt-on connection. Box lug terminals accept 8-3 AWG copper or aluminum wiring. Rated 10kAIC at 240VAC, the thermal-magnetic trip unit ensures precise response to overloads and short circuits.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THQB |
| Amperage | 45A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series Panelboards |
| Wire Gauge | 8-3 AWG (Cu), 8-3 AWG (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 (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Internal Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
7 answersWhich panelboards are compatible with the THQB32045ST1 circuit breaker?
This bolt-on breaker is designed for use in GE A-Series panelboards, AQ lighting panels, and ReliaGear RQ enclosures. It is not compatible with standard GE load centers that require plug-in THQL breakers.
Can I use a THQB32045ST1 in place of a THQL breaker?
No. The THQB series features a bolt-on mounting style for commercial panelboards, while the THQL series uses a plug-in connection for standard residential load centers. They are not interchangeable.
What does the ST1 suffix indicate on this GE THQB breaker?
The ST1 suffix means the breaker includes a factory-installed 120V shunt trip. This allows the breaker to be tripped remotely for emergency shutdown or automated control systems.
How does the THQB32045ST1 mount into the panel?
It features a bolt-on connection that fastens directly to the panel bus with screws. This provides a secure, vibration-resistant connection common in commercial and industrial applications compared to standard plug-in models.
Why is this breaker listed as both ABB and General Electric?
ABB acquired GE Industrial Solutions in 2018. The Q-Line breakers continue to be manufactured under the exact same catalog numbers, so an ABB THQB32045ST1 is a direct, interchangeable replacement for an older GE THQB32045ST1.
What type of trip unit is built into the THQB32045ST1?
It uses a non-interchangeable thermal magnetic trip unit with fixed long time and instantaneous trip functions to protect against overloads and short circuits.
What size wire is accepted by the box lugs on this 45A breaker?
The terminals accept 8 AWG to 3 AWG copper or aluminum wire. Always torque the connections to the manufacturer specifications printed on the breaker label.
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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.