ABB
1-Pole Q-Line Bolt-On Miniature Circuit Breakers
- Availability:
- Allow 2-3 Days to Ship
- Weight:
- 0.00 LBS
Description
1-Pole Q-Line Bolt-On Miniature Circuit Breakers
ABB Q-Line 1-Pole Bolt-On Miniature Circuit Breakers are designed for compatible panelboard and electrical distribution applications requiring compact single-pole branch circuit protection. This product family includes standard 15A, 20A, 25A, and 30A breakers, plus a 20A model with GFCI protection.
All five models use a 1-pole bolt-on configuration. Select the correct breaker according to the required ampere rating, protection type, system voltage, panelboard compatibility, conductor requirements, and complete electrical installation.
Product Highlights
- ABB Q-Line miniature circuit breaker family
- 1-pole configuration
- Bolt-on mounting
- 15A, 20A, 25A, and 30A standard breaker options
- 20A GFCI-protected option
- Compact branch circuit protection
- Designed for compatible panelboard applications
- Five catalog-number configurations
- Catalog numbers THQB1115, THQB1120, THQB1120GFT, THQB1125, and THQB1130
- Verify exact panelboard and voltage compatibility before ordering
Technical Specifications
| Manufacturer | ABB |
|---|---|
| Product Family | Q-Line |
| Product Type | Miniature Circuit Breaker |
| Mounting | Bolt-On |
| Number of Poles | 1 |
| Available Ampere Ratings | 15A, 20A, 25A, 30A |
| Available Protection Types | Standard Overcurrent Protection, GFCI Protection |
| Available Catalog Numbers | THQB1115, THQB1120, THQB1120GFT, THQB1125, THQB1130 |
| Primary Application | Compatible Panelboard Branch Circuit Protection |
Construction Details
ABB Q-Line breakers use a compact bolt-on mounting design for connection to compatible panelboard bus structures.
The breakers in this product group are all single-pole models. Standard configurations provide conventional branch circuit overcurrent protection, while THQB1120GFT adds GFCI protection for applications requiring ground-fault personnel protection.
Because bolt-on breakers are equipment-specific, confirm the exact panelboard, bus design, breaker family, system voltage, and installation requirements before ordering.
Available Circuit Breakers
Catalog Number & Configuration
| Catalog Number | Ampere Rating | Poles | Protection Type | Mounting |
|---|---|---|---|---|
| THQB1115 | 15A | 1 | Standard | Bolt-On |
| THQB1120 | 20A | 1 | Standard | Bolt-On |
| THQB1120GFT | 20A | 1 | GFCI Protection | Bolt-On |
| THQB1125 | 25A | 1 | Standard | Bolt-On |
| THQB1130 | 30A | 1 | Standard | Bolt-On |
Selecting the Correct Breaker
15A
Select THQB1115 for the standard 15A, 1-pole bolt-on configuration.
20A
Select THQB1120 for the standard 20A, 1-pole bolt-on configuration.
20A GFCI
Select THQB1120GFT when the application requires a 20A, 1-pole bolt-on breaker with GFCI protection.
25A
Select THQB1125 for the standard 25A, 1-pole bolt-on configuration.
30A
Select THQB1130 for the standard 30A, 1-pole bolt-on configuration.
Standard vs. GFCI Protection
Standard Breakers
THQB1115, THQB1120, THQB1125, and THQB1130 provide standard branch circuit overcurrent protection for compatible applications.
GFCI-Protected Breaker
THQB1120GFT combines a 20A single-pole breaker configuration with GFCI protection for compatible applications where ground-fault personnel protection is required.
Bolt-On Mounting
These Q-Line breakers use bolt-on mounting and must be installed only in compatible panelboards or electrical distribution equipment approved for the THQB breaker family.
Bolt-on construction provides a direct connection to the approved bus assembly, but the mounting method does not make the breaker universally interchangeable with other breaker families.
Common Applications
Branch Circuit Protection
- Compatible lighting panelboards
- Commercial electrical panels
- Branch circuit distribution
- Lighting circuits
- General electrical loads
GFCI Applications
- Compatible circuits requiring GFCI protection
- Service and maintenance areas
- Locations requiring personnel ground-fault protection
- Compatible commercial branch circuits
- Approved replacement applications
Installation & Selection Considerations
- Confirm the exact catalog number before ordering.
- Verify that a 1-pole bolt-on breaker is required.
- Select the required 15A, 20A, 25A, or 30A rating.
- Select THQB1120GFT only where a 20A GFCI-protected breaker is required.
- Confirm compatibility with the exact panelboard and bus system.
- Verify the applicable system voltage.
- Confirm the available fault current does not exceed the applicable breaker rating.
- Verify conductor material and size requirements.
- Follow ABB terminal and torque requirements.
- Do not substitute a plug-in breaker for a required bolt-on configuration.
- De-energize equipment before installation or service.
- Verify absence of voltage before working inside electrical equipment.
- Installation should be performed by qualified electrical personnel.
- Follow current ABB instructions and applicable electrical codes.
Product Documents
Review the ABB combined Q-Line 1-Pole breaker specifications for catalog-specific ampere ratings, electrical characteristics, protection types, dimensions, conductor requirements, listings, and additional manufacturer product information.
Need Help Selecting a Circuit Breaker?
Our electrical and industrial product specialists can help review your panelboard, required amperage, system voltage, GFCI requirements, conductor size, available fault current, and breaker compatibility before you order.
Frequently Asked Questions
How many poles do these breakers have?
All five breakers in this product group are single-pole Q-Line bolt-on breakers.
What ampere ratings are available?
The standard breaker options are 15A, 20A, 25A, and 30A. A 20A GFCI-protected option is also available.
What is THQB1115?
THQB1115 is the standard 15A, 1-pole bolt-on configuration.
What is THQB1120?
THQB1120 is the standard 20A, 1-pole bolt-on configuration.
What is THQB1120GFT?
THQB1120GFT is the 20A, 1-pole bolt-on configuration with GFCI protection.
What is THQB1125?
THQB1125 is the standard 25A, 1-pole bolt-on configuration.
What is THQB1130?
THQB1130 is the standard 30A, 1-pole bolt-on configuration.
Are these plug-in breakers?
No. These are bolt-on Q-Line breakers and must be matched to compatible panelboard equipment.
What is the difference between THQB1120 and THQB1120GFT?
Both are rated 20A and use a 1-pole bolt-on configuration, but THQB1120GFT adds GFCI protection.
Can I choose a breaker based only on amperage?
No. Also verify panelboard compatibility, system voltage, available fault current, conductor requirements, mounting type, and any required GFCI protection.
Where can I review ABB's specifications?
The ABB Q-Line 1-Pole Breaker Specifications PDF is linked in the Product Documents section above.
Important Ordering & Installation Notes
- Product: 1-Pole Q-Line Bolt-On Miniature Circuit Breakers.
- THQB1115: 15A.
- THQB1120: 20A.
- THQB1120GFT: 20A with GFCI Protection.
- THQB1125: 25A.
- THQB1130: 30A.
- Manufacturer: ABB.
- Product family: Q-Line.
- Number of poles: 1.
- Mounting: Bolt-On.
- Confirm exact panelboard compatibility before ordering.
- Verify system voltage and available fault current.
- Confirm conductor and terminal requirements.
- Select GFCI protection only where required by the application.
- De-energize equipment before installation or service.
- Installation should be performed by qualified electrical personnel.
- Follow current ABB instructions and applicable electrical codes.
