Description
Tandem Plug-In Circuit Breakers
ABB Q-Line Tandem Plug-In Circuit Breakers provide two independent 1-pole circuits in a compact tandem configuration, allowing two circuits to occupy the same panel space where the load center is approved for tandem breaker use.
This product family includes 15A/15A THQLT1515 and 20A/20A THQLT2020. ABB identifies these tandem breakers as compatible with applicable new and existing single-phase ABB and GE by ABB PowerMark load centers with or without wing stabs. :contentReference[oaicite:0]{index=0}
Product Highlights
- ABB Q-Line tandem circuit breaker family
- Plug-in mounting
- Two independent 1-pole circuits in a tandem configuration
- 15A/15A and 20A/20A configurations
- 120/240V rating
- 120V AC / 120/240V AC system applications
- 10 kAIC interrupting capacity rating
- Non-interchangeable trip style
- LI trip function
- Fixed long-time and instantaneous functions
- Suitable for reverse feed
- Cu/Al conductor compatibility
- HACR and SWD special markings listed by ABB
- Designed for compatible single-phase ABB and GE by ABB PowerMark load centers
Technical Specifications
| Manufacturer | ABB |
|---|---|
| Product Family | Q-Line |
| Product Type | Tandem Plug-In Circuit Breaker |
| Mounting | Plug-In |
| Configuration | Two 1-Pole Circuits |
| Available Ampere Ratings | 15A/15A, 20A/20A |
| Voltage | 120/240V |
| System Voltage | 120V AC / 120/240V AC |
| Interrupting Capacity | 10 kAIC |
| Trip Style | Non-Interchangeable |
| Trip Function | LI |
| Long Time | Fixed |
| Instantaneous | Fixed |
| Reverse Feed | Suitable |
| Conductor Compatibility | Cu/Al |
| Copper Wire Range | #14-8 CU |
| Aluminum Wire Range | #12-8 AL |
| Special Markings | HACR, SWD |
| Available Catalog Numbers | THQLT1515, THQLT2020 |
Construction Details
ABB describes its tandem breakers as providing twice the circuits in the same panel space. Each breaker contains two 1-pole circuits within a tandem configuration for use in compatible load-center positions.
The THQLT1515 provides two 15A circuits, while the THQLT2020 provides two 20A circuits. Both models use Q-Line plug-in construction and have a published 10 kAIC interrupting capacity rating. :contentReference[oaicite:1]{index=1}
ABB lists the breakers with a non-interchangeable trip style, LI trip function, fixed long-time and instantaneous characteristics, and suitability for reverse feed. :contentReference[oaicite:2]{index=2}
Available Tandem Breakers
Catalog Number & Ampere Rating
| Catalog Number | Circuit 1 | Circuit 2 | Configuration | Mounting |
|---|---|---|---|---|
| THQLT1515 | 15A | 15A | Tandem - Two 1-Pole Circuits | Plug-In |
| THQLT2020 | 20A | 20A | Tandem - Two 1-Pole Circuits | Plug-In |
Selecting the Correct Breaker
15A / 15A Tandem
Select THQLT1515 when the approved load-center position requires two 15A, 1-pole circuits in a tandem breaker configuration.
20A / 20A Tandem
Select THQLT2020 when the approved load-center position requires two 20A, 1-pole circuits in a tandem breaker configuration.
Model Selection Guide
| Ampere Configuration | Catalog Number | Circuits | Configuration | Mounting |
|---|---|---|---|---|
| 15A / 15A | THQLT1515 | Two 1-Pole Circuits | Tandem | Plug-In |
| 20A / 20A | THQLT2020 | Two 1-Pole Circuits | Tandem | Plug-In |
Tandem Breaker Design
A tandem breaker allows two individual 1-pole circuits to occupy the panel space associated with a compatible tandem breaker position.
ABB describes its tandem and quad breakers as providing the same panel space with twice the circuits. These breakers are intended only for load centers and breaker positions specifically approved for tandem breaker installation. :contentReference[oaicite:3]{index=3}
15A/15A vs. 20A/20A
THQLT1515 – 15A / 15A
The THQLT1515 contains two 15A, 1-pole circuits. ABB lists the breaker as a tandem 15A/1P and 15A/1P configuration.
THQLT2020 – 20A / 20A
The THQLT2020 contains two 20A, 1-pole circuits. ABB lists the breaker as a tandem 20A/1P and 20A/1P configuration. :contentReference[oaicite:4]{index=4}
Electrical Ratings
120/240V
ABB lists a 120/240V voltage rating for both THQLT1515 and THQLT2020.
10 kAIC
Both models have a published 10 kAIC interrupting capacity rating.
Two 1-Pole Circuits
Each tandem breaker provides two individual 1-pole circuit positions within the tandem breaker assembly. :contentReference[oaicite:5]{index=5}
Conductor Compatibility
ABB lists Cu/Al conductor compatibility for these tandem breakers. The published conductor range is #14-8 copper and #12-8 aluminum. :contentReference[oaicite:6]{index=6}
Always confirm conductor material, conductor size, terminal requirements, and applicable torque specifications for the exact installation before terminating conductors.
Load Center Compatibility
ABB states that its tandem and quad breakers are compatible with applicable new and existing single-phase ABB and GE by ABB PowerMark load centers with or without wing stabs. :contentReference[oaicite:7]{index=7}
Tandem breaker acceptance depends on the exact load center and breaker position. Confirm the load-center labeling and approved breaker configuration before installing THQLT1515 or THQLT2020.
Common Applications
Residential Load Centers
- Compatible ABB load centers
- Compatible GE by ABB PowerMark load centers
- Single-phase electrical distribution
- Residential branch circuits
- Approved tandem breaker positions
Space-Saving Applications
- Two circuits in a compatible tandem breaker position
- Load-center circuit expansion
- Replacement tandem breaker applications
- 15A branch circuit configurations
- 20A branch circuit configurations
Installation & Selection Considerations
- Confirm the exact catalog number before ordering.
- Select THQLT1515 when two 15A circuits are required.
- Select THQLT2020 when two 20A circuits are required.
- Verify that the load center is approved for tandem circuit breakers.
- Confirm that the intended breaker position accepts a tandem breaker.
- Verify compatibility with the exact ABB or GE by ABB PowerMark load center.
- Do not assume every breaker position in a load center accepts tandem breakers.
- Confirm system voltage before installation.
- Verify available fault current against the published 10 kAIC interrupting rating.
- Confirm conductor material and wire size requirements.
- Verify terminal and torque requirements before installation.
- Do not substitute a standard full-size breaker when a tandem configuration is required.
- Do not use a tandem breaker to exceed the load center's approved circuit count.
- Maintain applicable electrical working clearances.
- De-energize equipment before installation or service.
- Verify absence of voltage before working inside electrical equipment.
- Installation and service should be performed by qualified electrical personnel.
- Follow current ABB instructions, equipment labeling, and applicable electrical codes.
Product Documents
Review the ABB Tandem Plug-In Circuit Breaker documentation for THQLT1515 and THQLT2020 specifications, ampere configurations, voltage ratings, interrupting capacity, conductor requirements, trip characteristics, and load-center compatibility information.
Need Help Selecting a Tandem Circuit Breaker?
Our electrical and industrial product specialists can help review your load center, available breaker positions, required amperage, system voltage, conductor requirements, and tandem breaker compatibility before you order.
Frequently Asked Questions
What catalog numbers are available?
The available models are THQLT1515 and THQLT2020.
What is THQLT1515?
THQLT1515 is the tandem configuration containing two 15A, 1-pole circuits.
What is THQLT2020?
THQLT2020 is the tandem configuration containing two 20A, 1-pole circuits.
What does tandem mean?
A tandem breaker provides two individual 1-pole circuits within a compact breaker configuration designed for an approved tandem breaker position.
What is the voltage rating?
ABB lists both THQLT1515 and THQLT2020 at 120/240V.
What is the interrupting rating?
Both models have a published 10 kAIC interrupting capacity rating.
Can these breakers be installed in any load center?
No. The exact load center and breaker position must be approved for tandem breaker installation.
Are these plug-in breakers?
Yes. ABB identifies THQLT1515 and THQLT2020 as Q-Line plug-in breakers.
Can these breakers use copper or aluminum conductors?
ABB lists Cu/Al compatibility with a published range of #14-8 copper and #12-8 aluminum. Always verify the exact installation requirements before terminating conductors.
Are these breakers suitable for reverse feed?
Yes. ABB identifies both documented models as suitable for reverse feed.
Where can I review the ABB specifications?
The ABB Tandem Plug-In Circuit Breaker Product Details PDF is linked in the Product Documents section above.
Important Ordering & Installation Notes
- Product: Tandem Plug-In Circuit Breakers.
- THQLT1515 – 15A / 15A | Two 1-Pole Circuits.
- THQLT2020 – 20A / 20A | Two 1-Pole Circuits.
- Manufacturer: ABB.
- Product family: Q-Line.
- Mounting: Plug-In.
- Breaker configuration: Tandem.
- THQLT1515 should be selected when the approved application requires two 15A, 1-pole circuits.
- THQLT2020 should be selected when the approved application requires two 20A, 1-pole circuits.
- Confirm that the exact load center is approved for tandem circuit breakers before ordering.
- Verify that the intended breaker position is specifically approved to accept a tandem breaker.
- Do not assume that every breaker position in a compatible load center accepts tandem breakers.
- Do not use tandem breakers to exceed the maximum circuit count permitted by the load-center labeling.
- Confirm compatibility with the exact ABB or GE by ABB PowerMark load center and bus configuration.
- Verify system voltage before installation.
- Both models have a published 10 kAIC interrupting capacity rating; confirm available fault current does not exceed the applicable rating.
- ABB lists Cu/Al conductor compatibility; verify conductor material and size for the exact installation.
- Published conductor range is #14-8 copper and #12-8 aluminum.
- Confirm terminal requirements and follow ABB torque specifications.
- Do not exceed the ampere, voltage, or interrupting ratings of the breaker or connected equipment.
- Maintain required electrical working clearances around the load center.
- De-energize equipment before installing, removing, or servicing the circuit breaker.
- Verify absence of voltage before working inside electrical equipment.
- Installation and service should be performed by qualified electrical personnel.
- Follow current ABB installation instructions, load-center labeling, and all applicable local and national electrical codes.
