ABB / General ElectricTHQB2130
ABB / General Electric THQB21WY30 Miniature Circuit Breaker
- 30A
- 2 Pole
- Bolt-On
ABB / General Electric
THQB21WY30
Miniature Circuit Breaker
Brand
ABB / General Electric
SKU
THQB21WY30
Quantity
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ABB / General Electric THQB21WY30 - 30A 2 Pole Miniature Circuit Breaker
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Description
Part of the Q-Line family, this 30-amp bolt-on component features a specialized switched neutral configuration. Utilizing one protected pole alongside a switching neutral pole, it ensures complete circuit isolation during maintenance or fault conditions. It mounts into GE A-Series panelboards and AQ lighting panels via standard box lug terminals. The unit accepts 14-8 AWG copper or 12-8 AWG aluminum wiring. Rated for 10kAIC at 120VAC, it includes an internal common trip and HACR rating.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THQB |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Switched Neutral (Factory Construction) |
| Standards | UL 489, HACR |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Switched Neutral, HACR Rated, Quick-Make/Quick-Break, Non-Interchangeable Trip, Internal Common Trip |
| Special Features | Switching Neutral |
Product FAQs
5 answersWhich panelboards accept the THQB21WY30 breaker?
This bolt-on Q-Line breaker is specifically designed for GE A-Series panelboards and GE AQ lighting panels. Unlike plug-on residential breakers, it physically bolts to the panel bus, providing a secure, vibration-resistant connection for commercial applications.
What does the WY suffix indicate in the THQB21WY30 catalog number?
The WY suffix designates this as a switching neutral circuit breaker. Although it requires two panel spaces and mounts like a standard 2-pole breaker, it functions by providing thermal-magnetic protection on the hot conductor while simultaneously disconnecting the neutral conductor.
Why would an application require a switching neutral breaker?
Switching neutral breakers are used when safety codes mandate that all conductors, including the grounded neutral, must be completely isolated. This is commonly required by the National Electrical Code (NEC) for fuel dispensing equipment and certain hazardous locations to protect maintenance personnel.
Can I install this bolt-on breaker in a standard residential load center?
No. The THQB21WY30 features a bolt-on mounting style intended for commercial A-Series and AQ panels. Standard residential load centers typically require plug-on breakers, such as the THQL series, and do not have the threaded bus connections necessary for bolt-on installation.
Does the THQB21WY30 provide independent trip protection on both poles?
No. Because it is a switching neutral breaker, only the primary pole contains thermal-magnetic trip elements for overload and short-circuit protection. The second pole acts solely as a mechanical disconnect for the neutral wire when the primary pole trips or is manually turned off.
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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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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.