ABB / General Electric THHQB32070ST1 Miniature Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Quantity
ABB / General Electric THHQB32070ST1 - 70A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial environments, this 70A thermal-magnetic breaker features a factory-installed 120VAC shunt trip mechanism. It bolts securely into GE A-Series and AQ lighting panelboards, providing reliable overcurrent protection and remote tripping capabilities. Rated for 22kAIC at 240VAC, the unit includes internal common trip and quick-make/quick-break mechanisms to ensure consistent performance across all three phases.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THHQB |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 240VAC |
| 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 Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip, Reverse Feed, High Interrupting Capacity |
Product FAQs
7 answersWhat panelboards are compatible with the THHQB32070ST1?
This Q-Line bolt-on circuit breaker is designed for installation in GE A-Series panelboards and GE AQ lighting panels.
What does the ST1 suffix indicate on this GE breaker?
The ST1 suffix means this breaker is equipped with a factory-installed shunt trip. This accessory allows the breaker to be opened remotely via an electrical signal, making it ideal for emergency stop systems or remote equipment shutdown.
Can I use aluminum wire with this 70A breaker?
Yes, the box lugs are rated for both copper and aluminum conductors. You can use 4 to 1/0 AWG aluminum wire or 6 to 1/0 AWG copper wire.
Why might my THHQB32070ST1 arrive with ABB branding?
ABB acquired GE Industrial Solutions in 2018. Because of this transition, Q-Line circuit breakers may carry either ABB or General Electric branding. The breakers are identical in form, fit, and function regardless of the label.
How does a bolt-on breaker differ from a plug-on breaker?
Bolt-on breakers like the THHQB32070ST1 physically screw into the panelboard busbars rather than snapping into place. This creates a more secure, vibration-resistant connection that is typically required in commercial and industrial applications.
What type of protection does the thermal-magnetic trip unit provide?
The thermal-magnetic mechanism provides two layers of protection. The thermal element responds to prolonged overcurrents with a delayed trip, while the magnetic element provides an instantaneous trip to quickly clear severe short circuits.
What is the interrupting capacity of this breaker?
The THHQB32070ST1 features a high interrupting rating of 22kAIC at both 208V and 240VAC, making it suitable for systems with higher available fault currents compared to standard 10kAIC breakers.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
- JLJames L. L.Verified BuyerReviewingABB / General Electric THHQB21100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/6/26ABB / General Electric THHQB21100
Fast Service and delivery, The breaker was as described and brand new! Great pricing and great Service. I paid extra for UPS ground, it was delivered quickly.
- SNScott N.Verified BuyerReviewingABB / General Electric THHQB32030 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/30/25Perfect
The correct breaker the first time - every time.
- AGAlejandra G.Verified BuyerReviewingABB / General Electric THHQB1140 - 40A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Everithing is good!
Everithing is good!
- LMLuis M.ReviewingABB / General Electric THHQB2145 - 45A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/19/23Good product and good service
Good product and good service
- SHScott H.ReviewingABB / General Electric THHQB2180 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/21/2280amp commercial breaker
Great how easy it was to order and how fast I got it. I will order one again when needed