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Leviton Plug-On Mount AFCI/GFCI Thermal Magnetic Circuit Breaker, 1-Pole
Model: LEV-LB120-DFT
Leviton Plug-On Mount AFCI/GFCI Thermal Magnetic Circuit Breaker, 1-PoleThe Leviton Plug-On Mount AFCI/GFCI Thermal Magnetic Circuit Breaker is a combination arc-fault and ground-fault branch circuit...
Leviton
$81.48
Leviton Plug-On Mount AFCI Thermal Magnetic Branch Circuit Breaker
The Leviton Plug-On Mount AFCI Thermal Magnetic Branch Circuit Breaker is engineered to deliver dependable arc-fault and overcurrent protection for branch circuit wiring in residential and commercial electrical systems. This 1-Pole, 20-Amp, 120-Volt AC device combines AFCI (Arc-Fault Circuit Interrupter) detection with a thermal magnetic trip mechanism, responding to dangerous arcing conditions as well as sustained overloads and short-circuit currents. The plug-on mount design installs directly into compatible panelboards without additional hardware, simplifying both new installations and panel upgrades. As a branch circuit breaker from Leviton, it is built to integrate into standard panelboard layouts used across a wide range of electrical distribution applications, helping protect branch circuit wiring, connected equipment, and the building electrical system as a whole.
Key Features
- AFCI Protection: Arc-Fault Circuit Interrupter technology detects dangerous arcing conditions in branch circuit wiring that standard thermal magnetic breakers alone can miss.
- Thermal Magnetic Trip: Combines thermal response to sustained overloads with magnetic response to short-circuit currents for layered branch circuit protection.
- Electrical Rating: Rated 1-Pole, 20-Amp, 120-Volt AC for standard residential and commercial branch circuits.
- Plug-On Mount: Installs directly onto compatible panelboard bus bars for straightforward, tool-minimal mounting during installation or replacement.
- Branch Circuit Application: Purpose-built for branch circuit protection, helping isolate individual circuits from the rest of the electrical distribution system in the event of a fault.
- Panelboard Compatibility: Designed to fit into standard panelboard configurations, supporting straightforward integration into existing electrical distribution equipment.
- Leviton Build Quality: Manufactured by Leviton, a recognized name in electrical wiring devices and circuit protection components for professional installations.
Technical Specifications
- Amperage: 20A
- Voltage: 120V
- Poles: 1
- Device Type: AFCI
Typical Applications
- Residential and Commercial Panelboards
- Branch Circuit Arc-Fault Protection
- Load Center and Panelboard Wiring
- Electrical Distribution System Upgrades
- Renovation and New Construction Electrical Work
Why Leviton?
Leviton is a widely recognized manufacturer of electrical wiring devices and circuit protection products used across residential and commercial installations. This plug-on mount AFCI thermal magnetic branch circuit breaker reflects that focus, pairing arc-fault detection with a thermal magnetic trip mechanism to support code-compliant branch circuit protection. Electrical professionals can specify this Leviton circuit breaker as part of a broader panelboard system where consistent, reliable overcurrent and arc-fault protection is required for branch circuit wiring.
Manufacturer Resources
Product Specs
- Product Type:
- GFCI/AFCI Circuit Breaker
- Device Type:
- AFCI
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Circuit Breakers
Leviton LB220-T – Frequently Asked Questions
1) What amperages and pole configurations does the Leviton LB series plug-on breaker come in?
The Leviton LB plug-on branch breakers run 15A and 20A in 1-pole at 120V (LB115-GFT and LB120-AFT), and 15A, 20A, 30A, 50A and 60A in 2-pole at 120/240V (LB215-T, LB220-T, LB230-T, LB250-T, LB260-T). Pick the 1-pole 120V parts for lighting and general receptacle circuits, and the 2-pole 120/240V parts for the 240V loads on a panel, water heater, dryer, range circuit or a hardwired AC unit.
2) Will a Leviton LB plug-on breaker fit my existing panel, or do I need a mounting kit?
Plug-on mount means the breaker snaps straight onto the panelboard bus bar, so there is no rail, adapter or extra hardware to buy. What it does need is a load center built to take a plug-on breaker of this type. If the panel you are working in is a DIN rail enclosure rather than a bus-bar load center, this is the wrong mounting style and you want a DIN rail breaker such as the Square D C60 UL489 miniature circuit breaker instead.
3) Does the Leviton 20A 1-pole breaker give me arc-fault protection, or just overload protection?
Both. The 20-amp 120V single-pole unit is an AFCI device with a thermal magnetic trip, so it watches for arcing faults in the branch wiring on top of tripping on sustained overload and short circuit. A plain thermal magnetic breaker sees the overload and the short but not the low-current series arc in a damaged cable or a loose backstab connection, which is what AFCI is there for.
4) Can I use a Leviton LB 2-pole breaker on a 240-volt circuit?
Yes. The 2-pole LB breakers are rated 120/240V AC and land on both bus legs, which is what a 240-volt load needs. They go up to 60 amps: 15A, 20A, 30A, 50A and 60A. Size to the circuit conductors and the equipment nameplate, and note the 1-pole versions are 120V only, so they cannot be used in pairs to make a 240-volt circuit.
5) What is the difference between the Leviton LB120-AFT AFCI breaker and the Square D Multi9 C60 1-pole breaker?
The Leviton LB120-AFT is a 1-pole, 20-amp, 120-volt AC branch circuit breaker whose device type is AFCI, so it combines arc-fault detection with a thermal magnetic trip for overloads and short circuits. The Square D Multi9 C60 is a 1-pole C-curve miniature circuit breaker rated 120V AC, so it is an overcurrent device without arc-fault detection. On a circuit where the electrical code calls for arc-fault protection, the AFCI unit is the one that answers that requirement; the C60 is a straight branch overcurrent breaker with a C trip curve for loads with inrush.
6) Can a DIN rail mount breaker be used in place of a plug-on Leviton LB breaker?
No. The Leviton LB series is a plug-on mount breaker that installs directly onto compatible panelboard bus bars without additional hardware. The Square D C60 UL489 miniature circuit breaker is a DIN rail mount device, so it needs a DIN rail inside an enclosure or panel rather than a bus stab. The two are not interchangeable in the same panelboard; choose the plug-on unit for a bus-bar panelboard and the DIN rail unit where equipment is built up on rail.
7) Is a Square D PowerPacT B thermal magnetic breaker an equivalent to the Leviton LB120-AFT?
They share a thermal magnetic trip mechanism but they are not equivalents. The LB120-AFT is a 1-pole, 20-amp, 120V AC plug-on AFCI branch circuit breaker, so the arc-fault detection is part of the device. The Square D PowerPacT B is a thermal magnetic circuit breaker, which addresses overload and short circuit only. Substituting it on a circuit specified for arc-fault protection leaves that function uncovered.
8) What is the difference between a plug-on branch breaker like the Leviton LB and a molded case breaker like the Square D PowerPacT?
Different jobs at different points in the distribution. The Leviton LB is a branch circuit breaker, 15 to 60 amps, that plugs onto a load center bus to protect one circuit's wiring. The Square D PowerPacT B is a thermal magnetic molded case breaker, the class used for feeders, mains and larger equipment where a plug-on branch device does not have the frame for it. If you are protecting a receptacle or lighting circuit, the LB is the right level; if you are feeding a subpanel or a large motor load, look at the molded case line.
9) Is the Leviton LB120-AFT the same physical size slot as the 15-amp version?
Both the LB115 and the LB120 are single-pole plug-on devices, so each occupies one breaker position at 120V; the 2-pole LB215 through LB260 take two adjacent positions on opposite bus legs at 120/240V. Count your open spaces before ordering a 2-pole part, because a panel with one free single space will not take it.
10) What should be used instead of a Leviton LB 2-pole breaker for a feeder or main rather than a branch circuit?
The Leviton LB 2-pole units, such as the LB230-T at 30 amps and the LB260-T at 60 amps on 120/240V, are branch circuit breakers built to protect individual branch circuits within a panelboard. Where the application is a molded case breaker for larger distribution duty, the Square D PowerPacT B is a thermal magnetic circuit breaker, and the Square D PowerPacT Q is an I-Line circuit breaker for I-Line panelboard mounting. Match the frame to the equipment: the LB units for panelboard branch circuits, the PowerPacT series where the gear is built for a molded case or I-Line connection.
11) For a standard 15-amp 120V lighting circuit, is there a simpler alternative to the Leviton LB115-GFT?
The LB115-GFT is a 1-pole, 15-amp, 120V unit in the Leviton LB plug-on line. If the circuit does not call for the added protection built into that device and the panel is DIN rail equipment rather than a bus-bar panelboard, the Square D Multi9 C60 1-pole C-curve miniature circuit breaker at 120V AC is a plain overcurrent option. In a plug-on panelboard, stay within the Leviton LB line, where the 1-pole 120V positions are the 15-amp LB115-GFT and the 20-amp LB120-AFT.
12) A drawing calls for an I-Line breaker. Will a Leviton LB breaker satisfy it?
No. The Leviton LB breakers are plug-on mount branch circuit breakers that stab onto compatible panelboard bus bars. An I-Line callout refers to a specific panelboard connection system, which the Square D PowerPacT Q I-Line circuit breaker is built for. Use the I-Line breaker where the drawing specifies it, and the plug-on LB units where the panelboard takes plug-on branch breakers.
13) I manage apartment units and want the same breaker across every panel. How many parts does the Leviton LB line cover?
Seven configurations cover most of what turns up in a residential or light commercial panel: 15A and 20A single-pole at 120V for lighting and receptacle circuits, and 15A, 20A, 30A, 50A and 60A two-pole at 120/240V for water heaters, dryers, ranges and AC. Standardizing on the LB series means one manufacturer's plug-on profile across the building, and the 20A single-pole carries AFCI detection for the circuits where arc-fault protection is required.
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Does the Leviton LB220-T come with a warranty?
Absolutely. The Leviton LB220-T is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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