Leviton Plug-On Mount Standard Thermal Magnetic Branch Circuit Breaker
The Leviton Plug-On Mount Standard Thermal Magnetic Branch Circuit Breaker delivers reliable overcurrent protection for residential and light commercial panelboards, available with a 1-Pole configuration rated 15A at 120V AC. This thermal magnetic branch breaker combines a bimetal thermal element for sustained overload protection with a magnetic trip mechanism for rapid response to short-circuit conditions, and its plug-on mounting design snaps directly onto compatible bus bars for fast, tool-free installation. As a standard branch circuit breaker from Leviton, it is built to deliver dependable, code-compliant circuit protection for everyday electrical distribution needs, making it a practical choice for electricians and facility maintenance teams working on panelboard upgrades or new circuit additions.
Key Features
- Plug-On Mount: Snaps directly onto compatible panelboard bus bars for a quick, secure, tool-free connection that speeds up installation and future maintenance.
- Thermal Magnetic Trip: Combines a thermal element for gradual overload protection with a magnetic element for instantaneous response to fault currents, protecting branch circuit wiring and connected equipment.
- Electrical Rating: Configured for 15A at 120V AC with a 1-Pole design, sized for typical lighting and receptacle branch circuits.
- Standard Branch Breaker: Designed as a standard branch circuit breaker suited to typical residential and light commercial load center applications.
- Leviton Build Quality: Manufactured by Leviton, a recognized name in electrical distribution products, for consistent performance in demanding panelboard environments.
- Simplified Field Installation: The plug-on configuration reduces installation time compared to bolt-on alternatives, helping electricians complete panel work efficiently.
- Circuit Protection Reliability: The dual thermal and magnetic tripping action helps safeguard branch circuits from both sustained overloads and sudden short-circuit events, supporting safe, continuous operation of connected loads.
- Panelboard Compatibility: The plug-on style is intended for use in load centers designed to accept plug-on branch breakers, streamlining breaker replacement and panel servicing.
Technical Specifications
- Amperage: 15A
- Voltage: 120V
- Poles: 1
Typical Applications
- Residential Load Center and Panelboard Circuit Protection
- Light Commercial Electrical Distribution
- Branch Circuit Wiring for Lighting and Receptacle Loads
- Panel Upgrades and Circuit Breaker Replacements
- New Construction and Renovation Electrical Work
- General Overcurrent Protection in Load Centers
Why Leviton?
Leviton is a well-established manufacturer of electrical distribution and wiring products, and this plug-on mount thermal magnetic branch circuit breaker reflects that focus on dependable, code-compliant performance. Electrical professionals rely on Leviton circuit protection products to deliver consistent thermal magnetic trip behavior across residential and light commercial panelboard installations. Choosing a Leviton branch circuit breaker for panel work helps ensure straightforward installation and steady, predictable overcurrent protection for the life of the electrical system.
Manufacturer Resources
Product Specs
- Product Type:
- Circuit Breaker
- Connection Type:
- Plug-On Mount
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Circuit Breakers
Leviton LB115-T – Frequently Asked Questions
1) What amperage and pole combinations does the Leviton LB-T plug-on breaker come in?
Three configurations are offered: a 1-pole 15A at 120V (LB115-T), a 2-pole 25A at 120/240V (LB225-T), and a 2-pole 40A at 120/240V (LB240-T). The 1-pole 15A is the standard lighting and receptacle branch breaker; the 2-pole versions are for 240V loads such as water heaters, dryers, or small HVAC equipment.
2) Will a Leviton plug-on breaker fit a bolt-on panelboard?
No. The Leviton LB-T series is a plug-on mount breaker, meaning it snaps onto the panel bus stabs. A bolt-on panelboard needs a breaker that lands on a bus pad with screws, and the two are not interchangeable. Check that your load center is built to accept plug-on branch breakers before ordering.
3) Is a thermal magnetic breaker the right choice for a general lighting and receptacle circuit?
Yes for ordinary branch wiring. The thermal element uses a bimetal that reacts to sustained overload, while the magnetic element trips instantly on a short circuit, so both slow overcurrent and hard faults are covered. What it does not do is ground fault or arc fault detection, so if the circuit serves a location where the code requires GFCI or AFCI protection, you need a GFCI/AFCI breaker or a protected receptacle instead of this standard breaker.
4) Can I use the 15A 1-pole Leviton breaker on a 240V circuit?
No. The LB115-T is rated 120V AC, 1 pole, and only lands on a single bus leg. For a 240V load you need one of the 2-pole versions, the 25A LB225-T or the 40A LB240-T, both rated 120/240V.
5) What is the closest DIN rail alternative to the Leviton LB115-T when the panel is not a plug-on load center?
The Leviton LB115-T is a plug-on mount breaker, 1-pole, 15A, 120V, and it snaps onto the bus bar of a load center built to accept plug-on branch breakers. If the enclosure is a DIN rail assembly instead, the Square D C60 UL489 miniature circuit breaker is DIN rail mount, and the Square D Multi9 C60 1-pole C-curve miniature breaker is also rated 120V AC. Those mount to a rail rather than a bus stab, so the enclosure decides which one fits, not the amperage.
6) Is the ABB ST200M a substitute for a Leviton LB115-T branch breaker?
No. The ABB ST200M is a miniature circuit breaker built to UL1077, which is a supplementary protector standard rather than a branch circuit device standard. The Leviton LB115-T is a standard branch circuit breaker for load center branch wiring, 1-pole 15A at 120V. If the circuit needs branch protection in a panelboard, a UL489 device such as the Square D C60 UL489 miniature breaker is the comparable category; the ST200M serves supplementary protection inside equipment.
7) I need a 3-phase breaker for a commercial panel. Does Leviton make this in 3-pole?
Not in the LB-T line. The Leviton plug-on breakers are 1-pole and 2-pole only. For 3-pole work, ABB's A2N Series and E150 Series molded case breakers and the XT4 Series 3-pole kit are the three-pole options to look at.
8) Which Leviton breaker do I order for a 240V water heater or dryer circuit?
Size it to the nameplate and the conductor. The 2-pole 40A LB240-T covers the common 40A range on 120/240V, and the 2-pole 25A LB225-T handles lighter 240V loads. Both are plug-on mount, so the panel has to be a plug-on load center.
9) When should a molded case breaker be used instead of a Leviton plug-on branch breaker?
The Leviton plug-on breakers cover branch circuits in residential and light commercial load centers, in 1-pole 15A 120V, 2-pole 25A 120/240V and 2-pole 40A 120/240V. For feeder or main disconnect duty on larger three-phase distribution, a molded case device is the usual choice: the Square D PowerPacT B is a thermal magnetic molded case breaker, and the ABB A2N Series is a 3-pole molded case breaker that is UL listed. Those are a different frame class than a snap-in branch breaker, not a bigger version of one.
10) What three-phase thermal magnetic breaker compares to the Leviton thermal magnetic branch breaker?
The Leviton units use a thermal magnetic trip - a bimetal element for sustained overload and a magnetic element for short circuit - in 1-pole and 2-pole branch configurations. For three-phase service, the ABB E150 Series is a 3-pole thermal magnetic circuit breaker and uses the same trip principle in a three-pole frame. The Square D PowerPacT Q I-Line breaker is another three-phase distribution option, designed for I-Line panelboard mounting rather than a plug-on load center bus.
11) Do I need tools to install a Leviton LB series plug-on breaker?
Not to seat it. The plug-on design snaps directly onto the bus bar, so the breaker itself goes in without hardware, which is faster than a bolt-on for both new circuits and swap-outs during panel service. You still need a screwdriver to land the branch conductor in the breaker's lug, and the panel has to be de-energized and locked out for the work.
12) Do I need a breaker kit like the ABB XT4 instead of a Leviton plug-on breaker?
The ABB MBB33 is an XT4 Series 3-pole molded case circuit breaker kit, which is aimed at three-pole molded case installations rather than single or two-pole branch circuits. The Leviton plug-on breakers install by snapping onto a compatible panelboard bus bar with no tools and cover 15A 1-pole 120V, 25A 2-pole 120/240V and 40A 2-pole 120/240V lighting and receptacle circuits. For a straight branch breaker replacement in a plug-on load center, the Leviton is the matching form factor.
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Does the Leviton LB115-T come with a warranty?
Absolutely. The Leviton LB115-T is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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