ABB
3-Pole Q-Line Bolt-On Miniature Circuit Breakers
- Availability:
- Allow 2-3 Days to Ship
- Weight:
- 0.00 LBS
Description
3-Pole Q-Line Bolt-On Miniature Circuit Breakers
ABB Q-Line 3-Pole Bolt-On Miniature Circuit Breakers are designed for compatible panelboard and electrical distribution applications requiring three-pole branch or feeder circuit protection. This product family includes seven ampere ratings from 20A through 100A.
All listed models use a 3-pole bolt-on configuration. Select the correct breaker according to the required ampere rating, system voltage, available fault current, conductor requirements, and exact panelboard compatibility.
Product Highlights
- ABB Q-Line miniature circuit breaker family
- 3-pole configuration
- Bolt-on mounting
- 20A, 30A, 40A, 45A, 50A, 60A, and 100A options
- Designed for compatible panelboard and electrical distribution applications
- Seven catalog-number configurations
- Suitable for branch and feeder protection in approved equipment
- Verify exact panelboard and electrical ratings before ordering
Technical Specifications
| Manufacturer | ABB |
|---|---|
| Product Family | Q-Line |
| Product Type | Miniature Circuit Breaker |
| Mounting | Bolt-On |
| Number of Poles | 3 |
| Available Ampere Ratings | 20A, 30A, 40A, 45A, 50A, 60A, 100A |
| Available Catalog Numbers | THQB32020, THQB32030, THQB32040, THQB32045, THQB32050, THQB32060, THQB32100 |
| Primary Application | Compatible Panelboard and Electrical Distribution Equipment |
Construction Details
These Q-Line circuit breakers use a three-pole bolt-on configuration for compatible electrical distribution equipment.
Bolt-on breakers attach directly to the approved panelboard bus structure and should only be installed in equipment that is listed for the specific breaker family and catalog configuration.
Confirm the panelboard series, bus arrangement, breaker mounting provisions, system voltage, available fault current, and conductor requirements before installation.
Available Circuit Breakers
Catalog Number & Ampere Rating
| Catalog Number | Ampere Rating | Poles | Mounting |
|---|---|---|---|
| THQB32020 | 20A | 3 | Bolt-On |
| THQB32030 | 30A | 3 | Bolt-On |
| THQB32040 | 40A | 3 | Bolt-On |
| THQB32045 | 45A | 3 | Bolt-On |
| THQB32050 | 50A | 3 | Bolt-On |
| THQB32060 | 60A | 3 | Bolt-On |
| THQB32100 | 100A | 3 | Bolt-On |
Selecting the Correct Breaker
20A
THQB32020 – 20A, 3-pole bolt-on breaker.
30A
THQB32030 – 30A, 3-pole bolt-on breaker.
40A
THQB32040 – 40A, 3-pole bolt-on breaker.
45A
THQB32045 – 45A, 3-pole bolt-on breaker.
50A
THQB32050 – 50A, 3-pole bolt-on breaker.
60A
THQB32060 – 60A, 3-pole bolt-on breaker.
100A
THQB32100 – 100A, 3-pole bolt-on breaker.
Model Selection Guide
| Ampere Rating | Catalog Number | Poles | Mounting |
|---|---|---|---|
| 20A | THQB32020 | 3 | Bolt-On |
| 30A | THQB32030 | 3 | Bolt-On |
| 40A | THQB32040 | 3 | Bolt-On |
| 45A | THQB32045 | 3 | Bolt-On |
| 50A | THQB32050 | 3 | Bolt-On |
| 60A | THQB32060 | 3 | Bolt-On |
| 100A | THQB32100 | 3 | Bolt-On |
Three-Pole Configuration
These breakers use a three-pole configuration for compatible electrical systems requiring coordinated switching and overcurrent protection across three conductors.
Breaker selection should be based on the complete electrical system requirements rather than ampere rating alone.
Bolt-On Mounting
Direct Bus Connection
The bolt-on design provides a direct mechanical and electrical connection to the compatible panelboard bus structure.
Equipment-Specific Compatibility
Bolt-on circuit breakers are not universally interchangeable. Confirm that the selected THQB breaker is approved for the exact panelboard or distribution equipment.
Common Applications
Electrical Distribution
- Compatible panelboards
- Commercial electrical distribution
- Branch circuit protection
- Feeder circuit protection
- Electrical equipment panels
Maintenance & Replacement
- Compatible Q-Line breaker replacement
- Panelboard maintenance
- Electrical distribution upgrades
- Service and equipment repairs
- Approved bolt-on breaker applications
Installation & Selection Considerations
- Confirm the exact catalog number before ordering.
- Verify that a 3-pole Q-Line bolt-on breaker is required.
- Select the correct ampere rating for the circuit and connected equipment.
- Confirm compatibility with the exact panelboard or electrical equipment.
- Verify the system voltage before installation.
- Verify available fault current against the applicable breaker interrupting rating.
- Confirm conductor material and wire size requirements for the exact model.
- Follow ABB terminal and torque requirements.
- Do not substitute a plug-in breaker where a bolt-on breaker is required.
- Do not exceed the breaker or connected equipment electrical ratings.
- Maintain applicable electrical working clearances.
- 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 Q-Line 3-Pole breaker combined product details for catalog-specific ampere ratings, electrical characteristics, breaker construction, conductor requirements, dimensions, listings, and additional manufacturer information.
Need Help Selecting a Circuit Breaker?
Our electrical and industrial product specialists can help review your panelboard, required amperage, system voltage, available fault current, conductor requirements, and breaker compatibility before you order.
Frequently Asked Questions
How many poles do these breakers have?
All seven breakers in this product group use a 3-pole configuration.
What ampere ratings are available?
Available ratings are 20A, 30A, 40A, 45A, 50A, 60A, and 100A.
What is THQB32020?
THQB32020 is the 20A, 3-pole bolt-on configuration.
What is THQB32030?
THQB32030 is the 30A, 3-pole bolt-on configuration.
What is THQB32040?
THQB32040 is the 40A, 3-pole bolt-on configuration.
What is THQB32045?
THQB32045 is the 45A, 3-pole bolt-on configuration.
What is THQB32050?
THQB32050 is the 50A, 3-pole bolt-on configuration.
What is THQB32060?
THQB32060 is the 60A, 3-pole bolt-on configuration.
What is THQB32100?
THQB32100 is the 100A, 3-pole bolt-on configuration.
Can I select the breaker based only on amperage?
No. Also verify panelboard compatibility, system voltage, available fault current, conductor requirements, mounting type, and complete equipment ratings.
Where can I review the ABB product documentation?
The ABB Q-Line 3-Pole Breaker Product Details PDF is linked in the Product Documents section above.
Important Ordering & Installation Notes
- Product: 3-Pole Q-Line Bolt-On Miniature Circuit Breakers.
- THQB32020 – 20A.
- THQB32030 – 30A.
- THQB32040 – 40A.
- THQB32045 – 45A.
- THQB32050 – 50A.
- THQB32060 – 60A.
- THQB32100 – 100A.
- Manufacturer: ABB.
- Product family: Q-Line.
- Number of poles: 3.
- Mounting: Bolt-On.
- Select the exact ampere rating required for the circuit and connected equipment.
- Confirm the exact panelboard, load center, and bus compatibility before ordering.
- Do not substitute a plug-in breaker where a bolt-on breaker is required.
- Verify the system voltage before installation.
- Confirm the available fault current does not exceed the applicable breaker interrupting rating.
- Verify conductor material and wire size requirements for the exact catalog number selected.
- Confirm terminal and conductor requirements before installation.
- Follow ABB terminal torque specifications for the selected breaker.
- Do not exceed the ampere, voltage, or interrupting ratings of the breaker or connected equipment.
- Maintain required electrical working clearances around the panelboard or distribution equipment.
- De-energize equipment before installing, removing, or servicing the circuit breaker.
- Verify absence of voltage before working inside electrical equipment or panelboards.
- Installation and service should be performed by qualified electrical personnel.
- Follow current ABB installation instructions and all applicable local and national electrical codes.
