ABB / General Electric THQB32090ST1 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Quantity
ABB / General Electric THQB32090ST1 - 90A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed specifically for remote shutdown requirements, this 90-amp, 3-pole breaker includes a factory-installed 120-240VAC shunt trip mechanism. It fastens into GE A-Series and AQ lighting panels, providing a secure bolt-on connection for commercial and industrial environments. The unit features a 10kAIC rating at 240VAC, an internal common trip, and HACR certification, making it ideal for integrating with emergency stop systems or fire alarms.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQB32090ST1 |
| Series | THQB |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 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 | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, 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 answersCan I install the THQB32090ST1 in a standard GE residential load center?
No. This is a bolt-on circuit breaker designed specifically for commercial GE A-Series panelboards and AQ lighting panels. Standard residential GE load centers typically require plug-in style breakers, such as the THQL series.
What does the ST1 suffix mean in the THQB32090ST1 part number?
The ST1 suffix indicates that this breaker includes a factory-installed shunt trip accessory. This allows the breaker to be tripped remotely, which is commonly required for emergency stop systems, equipment shutdowns, or fire alarm integration.
How does the shunt trip mechanism on this breaker operate?
The factory-installed shunt trip requires an external voltage signal from a remote switch or relay. When the control voltage is applied to the shunt trip leads, it mechanically trips the breaker to open the circuit.
How does the THQB32090ST1 mount into the panelboard?
This is a bolt-on breaker, meaning it fastens directly to the panelboard bus bars using screws. This provides a highly secure mechanical and electrical connection, which is preferred in commercial and industrial environments subject to vibration.
Do I need special lugs to use aluminum wire with the THQB32090ST1?
No. The factory installed box lugs are dual-rated for both copper and aluminum conductors. You can directly terminate 4 to 1/0 AWG aluminum wire or 6 to 1/0 AWG copper wire into the standard lugs.
Is this breaker suitable for high fault current commercial applications?
The THQB32090ST1 has a standard interrupting rating of 10kAIC at 240V AC. If your commercial panel requires a higher short circuit rating, such as 22kAIC, you will need to source a high interrupting THHQB version instead.
Does this breaker provide ground fault or arc fault protection?
No. The THQB32090ST1 features standard thermal magnetic trip functions for overload and short circuit protection, along with the remote shunt trip capability. It does not include GFCI or AFCI protection.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 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.