ABB THQLT Q-Line Tandem Circui...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$20.86
ABB THQLT Q-Line Tandem Circuit Breaker, 120/240V, 15-20A

ABB THQLT Q-Line Tandem Circuit Breaker, 120/240V, 15-20A

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Model: THQLT1515

In Stock (leaves warehouse same day if ordered before 3pm ET)

$20.86
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ABB THQLT Q-Line Tandem Circuit Breaker, 120/240V, 15-20A

The ABB THQLT Q-Line Tandem Circuit Breaker delivers twice the circuits in the same panel space, giving electricians and facility managers a code-compliant way to add capacity without expanding the load center enclosure. This page covers the Q-Line tandem breaker family, available in 15 ampere and 20 ampere ratings and configured for 120 volt and 240 volt single phase distribution. Every option in this family shares a 2-1p tandem pole arrangement, an HACR SWD load rating, and a 10kA interrupt rating at 120 Vac and 10kA at 120/240 Vac, so installers get dependable thermal magnetic overcurrent protection no matter which amperage or voltage configuration the job calls for. It is compatible with new and existing single phase ABB and GE by ABB PowerMark load centers, with or without wing stabs, making it a practical retrofit option as well as a spec for new panel builds.

Key Features

  • Tandem Configuration: 2-1p pole arrangement fits two single-pole circuits into one standard breaker space, maximizing usable panel capacity without adding a subpanel.
  • Amperage Range: Available in 15 ampere and 20 ampere ratings to match circuit load requirements.
  • Voltage Range: Offered in 120 volt and 240 volt configurations for standard single phase residential and light commercial load centers.
  • Load Rating: HACR SWD rated, suitable for heating, air conditioning, refrigeration, and switching duty applications.
  • Interrupt Rating: 10kA@120 Vac and 10kA@120/240 Vac for dependable fault-current protection across the family.
  • Trip Mechanism: Thermal Magnetic trip mechanism with a Non-Interchangeable trip range and LI trip type for consistent, predictable overcurrent response.
  • Connection: Accepts (2) #14-8 CU / #12-8 AL conductors, giving installers flexibility in wire gauge and material.
  • Load Center Compatibility: Q-Line frame designed to fit new and existing single phase ABB and GE by ABB PowerMark load centers, with or without wing stabs.
  • Packaging: Sold as 1 EA for straightforward single-unit ordering.

Certifications & Compliance

  • Listed to Standard E11592

Technical Specifications

  • Trip Type: LI
  • Amperage Options: 15A, 20A
  • Voltage Options: 120V, 240V
  • Interrupt Rating: 10kA@120 Vac, 10kA@120/240 Vac
  • Wire Range: (2) #14-8 CU / #12-8 AL

Typical Applications

  • Residential and Light Commercial Load Centers
  • Panel Space-Saving Circuit Additions
  • Single Phase ABB and GE by ABB PowerMark Panelboards
  • Renovation and Retrofit Panel Upgrades
  • New Construction Electrical Distribution
  • HVAC and Refrigeration Circuit Protection

Why ABB?

ABB Q-Line tandem breakers across this 15A-20A, 120V-240V family are engineered for dependable thermal magnetic overcurrent protection, with a documented 10kA interrupt rating and HACR SWD load rating that support code-compliant panel work in demanding residential and light commercial settings. Their compatibility with existing ABB and GE by ABB PowerMark load centers makes them a straightforward choice for adding circuits without replacing the panel entirely, backed by ABB's Q-Line engineering and consistent Non-Interchangeable trip range design across every amperage and voltage option in the lineup.

Product Specs

Product Type:
Circuit Breaker
Voltage Rating:
120V-240V
Series:
Q-Line
Standards:
E11592
Country of Origin:
Unknown
Department:
Electrical
Product Group:
Wiring Devices
Configuration:
Tandem 2-1p
Amperage Rating:
15A-20A
Product Subgroup:
Circuit Breakers

ABB THQLT1515 – Frequently Asked Questions

1) What does a tandem breaker do that a standard single-pole breaker doesn't?
A tandem puts two independent single-pole circuits into one standard breaker space. The ABB Q-Line tandem is a 2-1p arrangement rated 120/240V, so you get two 120V branch circuits out of one slot. Use it when the panel has no spare spaces left but the busbar and panel schedule still allow more circuits. It is not a two-pole breaker and will not feed a 240V load; a 240V circuit needs a true 2-pole device spanning both bus legs.
2) What wire sizes will the ABB Q-Line tandem breaker terminals accept?
Each Q-Line tandem accepts (2) #14-8 copper or #12-8 aluminum conductors, so you can land 14 AWG through 8 AWG copper on it. That range covers standard 15A and 20A branch circuits in copper as well as aluminum branch wiring down to 12 AWG.
3) Can a Square D Multi9 C60 breaker be used in place of an ABB Q-Line tandem breaker in a PowerMark load center?
No. The ABB Q-Line tandem breaker uses a Q-Line plug-on frame designed to fit new and existing single phase ABB and GE by ABB PowerMark load centers, with or without wing stabs. The Square D Multi9 C60 is a 1-pole C-curve miniature circuit breaker rated 120V AC from the Multi9 C60 series, a DIN rail style device rather than a load center plug-on breaker, so it will not land on PowerMark bus stabs. To add circuits in a PowerMark panel, stay with the Q-Line tandem, offered in 15 ampere and 20 ampere configurations.
4) What should I use instead of a Q-Line tandem breaker if the panel is a DIN rail enclosure rather than a load center?
The ABB Q-Line tandem breaker is a load center plug-on device rated 120/240V that seats on PowerMark bus stabs, so it has no place in a DIN rail enclosure. For DIN rail mounting, the Square D C60 UL489 miniature circuit breaker is built as a DIN rail mount MCB from the C60 series. Note that the C60 is a single-device miniature breaker and does not provide the two-circuits-in-one-space tandem arrangement the Q-Line gives you.
5) Is the Square D PowerPacT Q I-Line breaker the same thing as an ABB Q-Line breaker because both say Q?
No, the names are coincidental. The Square D PowerPacT Q is an I-Line circuit breaker in the PowerPacT Q series, an I-Line mounting style used in Square D panelboards. The ABB Q-Line tandem breaker is a plug-on branch breaker rated 120/240V for single phase ABB and GE by ABB PowerMark load centers, supplied in 15 ampere and 20 ampere tandem configurations. Neither will mount in the other's panel, so order by the panel make, not by the letter in the series name.
6) Is this ABB breaker rated for an air conditioner or refrigeration circuit?
The Q-Line tandem carries an HACR SWD load rating, which covers heating, air conditioning and refrigeration equipment as well as switching duty. SWD also means it can be used for switching fluorescent lighting loads. Size it to the equipment nameplate, not just the wire.
7) What is the interrupting rating on the ABB Q-Line tandem breaker?
10kA at 120 Vac and 10kA at 120/240 Vac. That matters when the available fault current at the panel exceeds the more common 10kA floor on residential breakers, so check the service transformer and conductor run on light commercial work before you assume it clears.
8) Which amperages does the ABB Q-Line tandem come in?
Two: a 15 amp version, part number THQLT1515, and a 20 amp version, part number THQLT2020. Both are tandem 2-1p devices in one panel space. Order by the part number so you don't end up with a 20 amp breaker on 14 AWG wire.
9) How is this different from a Square D PowerPacT or Multi9 breaker?
Different classes of device. The ABB Q-Line tandem is a plug-on load center breaker for single phase ABB and GE by ABB PowerMark panels. The Square D Multi9 C60 and C60 UL489 are DIN rail mount miniature circuit breakers, used in control panels and equipment enclosures rather than a residential load center. The Square D PowerPacT B is a thermal magnetic molded case breaker and the PowerPacT Q is an I-Line device for I-Line panelboards. None of those plug into a PowerMark bus, so they are not substitutes for a Q-Line tandem.
10) Can I put tandem breakers anywhere in the panel?
Not necessarily. The ABB Q-Line tandem is physically built for single phase ABB and GE by ABB PowerMark load centers with or without wing stabs, but the panel's own label dictates how many tandems the enclosure permits and which bus positions will take them. Check the label inside the door against your circuit count before ordering.
11) When is a molded case breaker like the Square D PowerPacT B the right call instead of an ABB Q-Line tandem?
The ABB Q-Line tandem is a branch-circuit device for single phase residential and light commercial load centers, rated 120/240V with a 10kA interrupt rating and thermal magnetic, non-interchangeable trip. When the application is a feeder or main rather than a branch circuit, a molded case device applies instead: the Square D PowerPacT B is a thermal magnetic circuit breaker in the PowerPacT B series. Both use thermal magnetic tripping, but the PowerPacT B is a molded case frame rather than a plug-on load center breaker, so it mounts differently and is not interchangeable with Q-Line spaces.
12) For HVAC and refrigeration branch circuits, does the ABB Q-Line tandem cover the duty or do I need a different breaker family?
The ABB Q-Line tandem carries an HACR SWD load rating, which covers heating, air conditioning, refrigeration and switching duty branch circuits, with a 10kA interrupt rating and LI trip type. It is the branch-level device. The Square D PowerPacT B thermal magnetic breaker is a molded case unit in the PowerPacT B series and suits equipment or feeder protection rather than a plug-on load center branch space, so the two serve different points in the same distribution path rather than substituting for each other.
13) What kind of trip mechanism does the Q-Line tandem use?
Thermal magnetic, with an LI trip type and a non-interchangeable trip rating. Thermal handles sustained overload, magnetic handles short circuit, and non-interchangeable means the trip unit is fixed at the marked ampere rating and cannot be swapped or adjusted in the field.
How fast can I get the ABB THQLT1515 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ABB THQLT1515 come with a warranty?
Absolutely. The ABB THQLT1515 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the ABB THQLT1515?
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