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ABB THQC Q-Line Lug-Lug Thermal-Magnetic Circuit Breaker, 120/240V
Model: ABB-THQC
ABB THQC Q-Line Lug-Lug Thermal-Magnetic Circuit Breaker, 120/240VThe ABB THQC Q-Line Lug-Lug Circuit Breaker is a compact, one-inch-wide-per-pole thermal-magnetic device engineered for residential...
ABB
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$508.45
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ABB THHQB Q Line Bolt-On Thermal-Magnetic Circuit Breaker
The ABB THHQB Q Line circuit breaker is a one-inch-wide-per-pole, compact thermal-magnetic device engineered for residential and commercial electrical systems. As the bolt-on version of the Q Line family, this breaker bolts directly to the bus connections of load centers and lighting panels for a secure, code-compliant fit. This family is offered across amperage ratings from 15 amperes to 100 amperes (15A, 20A, 30A, 50A, 60A, 70A, and 100A options) and in 1, 2, and 3 pole configurations, so installers can match the exact overcurrent protection required for a given circuit. Built to Standard E11592 with an LI thermal-magnetic trip type, the Q Line THHQB delivers dependable overcurrent protection backed by a quick-make/quick-break mechanism for fast, safe circuit interruption.
Key Features
- Bolt-On Mounting: designed to bolt directly to the bus connections of load centers and lighting panels for a secure, vibration-resistant fit.
- Thermal-Magnetic Trip: LI trip type provides reliable thermal-magnetic overcurrent protection built to Standard E11592.
- Amperage Range: available in 15, 20, 30, 50, 60, 70, and 100 ampere ratings to suit a wide range of branch-circuit and feeder applications.
- Pole Configurations: offered in 1, 2, and 3 pole versions to cover single-circuit and multi-circuit protection needs.
- Quick-Make/Quick-Break Mechanism: ensures rapid, positive circuit make and break for improved safety and reliability.
- Common Trip Bar: multi-pole units trip together as a single unit for coordinated circuit protection.
- Visible Trip Indication: easy-to-spot trip indicator lets technicians quickly identify a tripped breaker.
- Accessory Ready: can be ordered with auxiliary contact and shunt trip accessories for expanded control and monitoring.
- HID Application Rated: available for use in HID (high-intensity discharge) lighting circuits.
- Non-Interchangeable Trip Range: fixed thermal-magnetic trip setting for consistent, tamper-resistant protection.
Certifications & Compliance
- Built to Standard E11592
Technical Specifications
- Trip Type: LI (Thermal-Magnetic)
- Mounting: Bolt-On
- Amperage Options: 15A, 20A, 30A, 50A, 60A, 70A, 100A
- Pole Options: 1, 2, 3 Pole
- Standard: E11592
Typical Applications
- Residential and Commercial Load Center Wiring
- Lighting Panel Circuit Protection
- Panelboard Bus Connections
- HID Lighting Circuit Protection
- Renovation and New Construction Electrical Work
Why ABB?
ABB's Q Line THHQB bolt-on breakers combine a compact, one-inch-per-pole footprint with a quick-make/quick-break mechanism, common trip bars, and clear trip indication to keep panelboards safe and easy to service. Built to Standard E11592 with a thermal-magnetic LI trip and available across 15A to 100A ratings in 1, 2, and 3 pole configurations, with auxiliary contact and shunt trip accessories available, the Q Line THHQB is a dependable choice for professional electrical installations requiring code-compliant, reliable overcurrent protection.
"Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Circuit Breaker
- Series:
- Q Line
- Standards:
- E11592
- Country of Origin:
- Unknown
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Material:
- Thermoplastic
- Connection Type:
- Bolt-On
- Amperage Rating:
- 15A - 100A
- Configuration:
- 1, 2, 3 Pole
- Product Subgroup:
- Circuit Breakers
ABB THHQB1120 – Frequently Asked Questions
1) Is the ABB THHQB a plug-in breaker or does it bolt to the panel bus?
Bolt-on. The Q Line QB bolts directly to the bus connections of a load center or lighting panel rather than clipping on, which gives a vibration-resistant connection. That also means the panel has to be a bolt-on panelboard; a plug-in load center bus will not accept it.
2) What amperages and pole counts does the ABB THHQB circuit breaker come in?
Single-pole in 15 and 20 amp (THHQB1115, THHQB1120), two-pole in 20, 30 and 100 amp (THHQB2120, THHQB2130, THHQB21100), and three-pole in 20, 50, 60 and 70 amp (THHQB32020, THHQB32050, THHQB32060, THHQB32070).
3) On a two or three pole THHQB, do all poles trip together on a single-phase fault?
Yes. Multi-pole Q Line QB breakers use a common trip bar, so a fault on one pole trips the whole device as a unit. That is what you need for a three-phase motor or a 240V circuit where losing one leg is worse than losing all of them.
4) What is the difference between the ABB Q Line QB bolt-on breaker and a Square D C60 DIN rail breaker?
They mount in completely different ways. The ABB Q Line QB is a bolt-on breaker that bolts directly to the bus connections of a load center or lighting panel, at one inch wide per pole, in 1, 2, and 3 pole versions. The Square D C60 UL489 miniature circuit breaker is a DIN rail mount device, so it clips onto a DIN rail inside a control panel or enclosure rather than bolting to a panelboard bus. If the opening is a residential or commercial load center with a bolt-on bus, the Q Line QB is the fit; if you are populating a DIN rail in an industrial control cabinet, the C60 is the one that will physically land.
5) I need a 120V single-pole breaker for a lighting circuit but my panel takes DIN rail devices. What should I use instead of the ABB THHQB1115?
The ABB THHQB1115 is a 15 amp, 1 pole Q Line QB that bolts to a panelboard bus, so it will not mount to a DIN rail. For a DIN rail application, the Square D Multi9 C60 1-pole C-curve miniature circuit breaker is rated 120V AC and is the type of device that rail installation expects. Keep in mind the C-curve is a defined magnetic trip curve, while the Q Line QB uses a fixed LI thermal-magnetic trip built to Standard E11592, so verify the curve suits your load before swapping.
6) Is the Square D PowerPacT Q a direct replacement for an ABB Q Line QB breaker?
No, despite both carrying a Q in the name they are different classes of device. The ABB Q Line QB is a compact one-inch-per-pole plug-in-footprint breaker that bolts to load center and lighting panel bus connections, offered from 15 amps single pole up to 100 amps two pole. The Square D PowerPacT Q is an I-Line circuit breaker, meaning it is built for Square D I-Line panelboard bus stabs rather than a load center bolt-on bus. Confirm the panel make and bus style before ordering either one.
7) How much panel space does an ABB Q Line QB breaker take per pole?
One inch of panel width per pole. A single-pole eats one space, a two-pole two, a three-pole three. Useful when you are filling out a tight lighting panel and counting remaining spaces.
8) Can I use an ABB Q Line QB breaker on HID lighting circuits?
Yes, the Q Line QB is rated for HID (high-intensity discharge) lighting applications, which is why it turns up in parking lot and warehouse lighting panels where the inrush of ballasted HID loads nuisance-trips ordinary breakers.
9) Can I add a shunt trip or auxiliary contact to an ABB THHQB breaker?
Both are available. The Q Line QB can be ordered with auxiliary contact and shunt trip accessories for remote monitoring or remote tripping, so specify them at the time you place the order rather than assuming a standard breaker will take them later.
10) Can the trip setting on the ABB Q Line QB be adjusted in the field?
No. It has a non-interchangeable, fixed thermal-magnetic trip. Size the breaker to the circuit at order time, because there is no field adjustment and no swapping trip units. The upside for a facility is that nobody can quietly bump the setting up.
11) What is an alternative to an ABB bolt-on breaker if my panel is DIN rail rather than a bolt-on bus?
The Q Line QB will not work on DIN rail, it only bolts to a panelboard bus. For DIN rail mounting, Square D's C60 UL489 miniature circuit breaker is the DIN rail mount option we carry, and the Multi9 C60 1-pole C-curve unit covers 120V AC control and lighting branch circuits on the same rail.
12) I need more than 100 amps in a bolt-on panel. What should I look at instead of the ABB THHQB?
The Q Line QB tops out at 100 amps, on the two-pole THHQB21100. For larger frames, the Square D PowerPacT B thermal magnetic breaker is the molded case alternative we stock, and the PowerPacT Q I-Line breaker is the choice where the panel is an I-Line bus rather than a bolt-on load center.
13) What is a comparable thermal-magnetic molded case breaker if the ABB Q Line QB will not fit my panel?
The Square D PowerPacT B is also a thermal magnetic circuit breaker, so it protects on the same operating principle as the ABB Q Line QB with its LI thermal-magnetic trip. The difference is form factor: the Q Line QB is a one-inch-per-pole bolt-on device for load centers and lighting panels with a non-interchangeable fixed trip, while the PowerPacT B is a molded case frame sized for larger feeder and main applications. Match the frame to the panel interior you are working in.
14) For a 3-pole 60 amp HID lighting circuit, is the ABB THHQB32060 the right choice over a miniature DIN rail breaker?
The THHQB32060 is a 60 amp, 3 pole Q Line QB, and the Q Line QB family is offered for HID high-intensity discharge lighting circuits, with a common trip bar so all three poles trip as one unit and a visible trip indicator for fast troubleshooting. The Square D Multi9 C60 and C60 comparables are single-pole and DIN rail miniature breakers respectively, which serve control panel and small branch duty rather than a three-phase HID lighting feeder in a lighting panel.
15) Which breaker should I standardize on across a multi-family load center retrofit, the ABB Q Line QB or a Square D PowerPacT?
For branch circuits in residential and commercial load centers and lighting panels, the ABB Q Line QB covers the range with one part family: 15 and 20 amp single pole, 20 through 100 amp two pole, and 20 through 70 amp three pole, all one inch wide per pole with a fixed non-interchangeable trip that keeps settings tamper-resistant across a portfolio. The Square D PowerPacT B thermal magnetic and PowerPacT Q I-Line breakers are larger molded case devices suited to mains and feeders rather than dense branch circuit panels. Many jobs use both, with the Q Line QB filling the branch positions.
16) How does a technician tell which ABB Q Line breaker has tripped in a full panel?
The Q Line QB carries a visible trip indicator, so a tripped device is identifiable at a glance without cycling every handle. The quick-make/quick-break mechanism means the handle position is positive on both making and breaking the circuit.
17) What standard is the ABB Q Line QB thermal-magnetic breaker built to?
It is built to Standard E11592, with an LI (thermal-magnetic, long-time plus instantaneous) trip characteristic. That is the spec to quote when an engineer asks what the breaker is manufactured against.
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Does the ABB THHQB1120 come with a warranty?
Absolutely. The ABB THHQB1120 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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