ABB / General Electric THHQB32020ST1 Miniature Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Quantity
ABB / General Electric THHQB32020ST1 - 20A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Featuring a factory-installed 120VAC shunt trip accessory, this 20-amp miniature breaker enables remote tripping capabilities for emergency shutdowns or automated control systems. The three-pole configuration delivers reliable thermal-magnetic protection. Designed to mount into GE AQ, A-Series, and ReliaGear panelboards. The bolt-on terminals provide a highly secure, vibration-proof connection for industrial applications.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THHQB |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 120VAC, 22kA @ 240VAC, 22kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series Panelboards, GE AQ Panelboards, ReliaGear Panelboards |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 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, Undervoltage Release, Padlock Attachment, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 10C to 50C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
6 answersWhat panelboards are compatible with the THHQB32020ST1?
This commercial-grade breaker is designed specifically for bolt-on installation in GE A-Series, GE AQ, and ReliaGear panelboards.
What does the ST1 suffix mean on this GE circuit breaker?
The ST1 suffix indicates that the breaker is equipped with a factory-installed 120V shunt trip accessory. This allows the breaker to be tripped remotely by applying a voltage signal.
Why might my THHQB32020ST1 arrive with ABB branding instead of GE?
ABB acquired GE Industrial Solutions in 2018. As a result, current production models of this exact breaker may feature either ABB or GE branding, but they are identical in form, fit, and function.
What is the difference between GE THQB and THHQB circuit breakers?
The difference lies in their interrupting capacity. Standard THQB breakers typically have a 10kAIC rating, while the THHQB series features a higher 22kAIC rating for environments with higher available fault currents.
How does a bolt-on connection differ from a plug-in breaker?
Bolt-on breakers like the THHQB32020ST1 feature mounting brackets that physically bolt to the panelboard bus bars. This provides a highly secure, vibration-resistant connection commonly required in commercial and industrial electrical systems.
What type of protection does the THHQB32020ST1 provide?
It utilizes a fixed thermal magnetic trip unit with long-time and instantaneous (LI) functions. The thermal component protects against prolonged overloads, while the magnetic component instantly clears severe short circuits.
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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