ABB / General ElectricTHQB32045ST1
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ABB / General Electric THQB32050ST1 Miniature Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
ABB / General Electric
THQB32050ST1
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB32050ST1
Quantity
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ABB / General Electric THQB32050ST1 - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
ABB / General Electric THQB32050ST1 - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32050ST1-R |
| Series | THQB |
| Amperage | 50A |
| 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, GE AQ Lighting Panels |
| 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 |
| Available Options | Auxiliary Switch, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Sold out
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ABB / General Electric THQB32050ST1 - 50A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32050ST1-R |
| Series | THQB |
| Amperage | 50A |
| 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, GE AQ Lighting Panels |
| 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 |
| Available Options | Auxiliary Switch, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
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Description
Built for commercial applications, this 50A Q-Line circuit breaker includes a factory-installed shunt trip for remote shutdown capabilities. The thermal-magnetic design utilizes a quick-make, quick-break mechanism for reliable protection. This three-pole device bolts into GE A-Series panelboards and AQ lighting panels. It features box lug terminals that accept 8-3 AWG wiring. Rated at 10kAIC at 240VAC, the breaker provides standard LI trip functions. It is HACR rated and features a common trip.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32050ST1-R |
| Series | THQB |
| Amperage | 50A |
| 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, GE AQ Lighting Panels |
| 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 |
| Available Options | Auxiliary Switch, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break |
Product FAQs
5 answersWhat does the ST1 suffix mean on this THQB breaker?
The ST1 suffix indicates that this model features a factory-installed 120V AC shunt trip accessory. This allows the breaker to be tripped remotely via an external control signal, which is commonly required for emergency stops, fire alarm systems, or equipment shutdown circuits.
Are ABB and General Electric THQB breakers the same?
Yes. Following ABB's acquisition of GE Industrial Solutions, they continue to manufacture the THQB product line under the exact same catalog numbers. An ABB-branded THQB32050ST1 is a direct, interchangeable replacement for a legacy GE-branded breaker of the same model.
Can I install this bolt-on breaker in a standard GE residential load center?
No. THQB breakers utilize a bolt-on mounting design and are strictly for use in commercial lighting and distribution panels like the GE A-Series or AQ panels. If you need a breaker for a standard GE load center, you must use a plug-in THQL series breaker.
Is this 240V-rated breaker suitable for use on 208V commercial power systems?
Yes. Although its maximum rating is 240V AC, this three-pole breaker is fully compatible with 208V and 208Y/120V three-phase systems standard in commercial facilities. It carries a 10kA interrupting rating at 208V.
Does the THQB32050ST1 provide ground fault or arc fault protection?
No. This is a standard thermal-magnetic breaker featuring long-time and instantaneous trip functions to protect against overloads and short circuits. It does not include GFCI or AFCI protection.
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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.