ABB / General ElectricTHQB32020
ABB / General Electric THQB31WY20 Miniature Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
ABB / General Electric
THQB31WY20
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB31WY20
Quantity
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ABB / General Electric THQB31WY20 - 20A 3 Pole Miniature Circuit Breaker
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Description
Rated for 20 amps, this three-pole Q-Line miniature breaker incorporates a factory-configured switched neutral to meet specific commercial isolation requirements. The device bolts firmly into GE A-Series panelboards and AQ lighting panels, offering a robust mechanical connection for industrial environments. Delivering a standard 10kAIC interrupt capacity, it includes quick-make/quick-break contacts and an internal common trip to guarantee reliable performance under load.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THQB |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | THQB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | GE A-Series Panelboards, GE AQ Lighting Panels |
| 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Padlock Attachment |
|---|---|
| Accessories | Switched Neutral (Factory Configured) |
| Standards | UL 489, HACR |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Switched Neutral, Internal Common Trip, HACR Rated, Quick-Make/Quick-Break |
| Special Features | Switching Neutral |
Product FAQs
8 answersWhat does the "WY" suffix mean in the THQB31WY20 catalog number?
The "WY" suffix indicates that this breaker includes a switching neutral. It is a 3-pole breaker where two poles provide thermal-magnetic overcurrent protection for the hot legs, and the third pole acts as a switching neutral to disconnect the neutral conductor when the breaker trips or is manually opened.
When is a switching neutral circuit breaker required?
Switching neutral breakers are used in applications where all conductors, including the grounded neutral conductor, must be disconnected simultaneously. This is commonly required for fuel dispensing equipment or specific medical and industrial equipment to ensure complete isolation for maintenance and safety.
Can I use this breaker for 3-phase applications?
No. Although it is a 3-pole breaker, the THQB31WY20 is designed for single-phase 120/240V applications where two poles connect to the hot legs and the third pole switches the neutral. It is not intended for 3-phase power distribution.
Can I use the THQB31WY20 in a standard GE load center?
No. The THQB31WY20 is a bolt-on circuit breaker designed for GE A-Series panelboards and AQ lighting panels. It will not fit in standard residential GE PowerMark Gold load centers, which require plug-on THQL series breakers.
What is the difference between THQB and THQL breakers?
THQB breakers, like the THQB31WY20, feature a bolt-on connection designed for commercial panelboards. THQL breakers have a plug-on connection typically used in residential load centers. They are not interchangeable.
How does the trip indication work on this breaker?
Like all GE Q-Line circuit breakers, the THQB31WY20 features an easy-to-spot trip indication. When the breaker trips due to an overcurrent or short circuit, the handle snaps to a center position, making it easy to identify the tripped breaker in a crowded panel.
Are the trip settings adjustable on the THQB31WY20?
No. This breaker features fixed long-time and instantaneous trip functions. The thermal-magnetic trip settings are non-interchangeable and cannot be adjusted in the field.
What does the "LI" trip function code mean?
The "LI" code stands for Long-Time and Instantaneous trip functions. The long-time function provides thermal protection against sustained overloads, while the instantaneous function provides magnetic protection against sudden short circuits.
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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.