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Eaton BR Series Main Lug Loadcenter 400A Single-Phase 42-Circuit NEMA 3R Electrical PanelProfessional electrical distribution for residential and commercial applicationsThe Eaton BR Series Main Lug...
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Eaton BR Series Three-Phase Main Breaker Loadcenter 100A 24-Circuit 12-Space NEMA 1 Electrical Panel
Professional three-phase power distribution for commercial and industrial applications
The Eaton BR Series Three-Phase Main Breaker Loadcenter delivers reliable 100A power distribution with 24-circuit capacity in a compact 12-space configuration. This UL 67 listed electrical panel features a galvanized steel NEMA 1 enclosure with aluminum bus construction and 10 kAIC interrupt rating, providing professional-grade performance for three-phase 208Y/120V and 240V applications. Listed for use as service entrance equipment with preattached neutral bonding strap for streamlined installation.
Professional Features & Benefits
- 100A Three-Phase Capacity: Handles substantial electrical loads for commercial and light industrial applications with reliable power distribution.
- 24-Circuit 12-Space Design: Maximizes circuit capacity while maintaining compact footprint for efficient space utilization.
- NEMA 1 Galvanized Steel Enclosure: Provides durable protection against environmental factors with corrosion-resistant construction.
- 10 kAIC Interrupt Rating: Delivers robust fault protection capability for enhanced electrical safety and system reliability.
- UL 67 Listed Service Entrance: Meets stringent safety standards with preattached neutral bonding strap for compliant installation.
- Aluminum Bus Construction: Ensures efficient power transmission with reliable conductivity and thermal performance.
- Type BR Breaker Compatibility: Works with standard 1-inch BR breakers for flexible circuit protection options.
Technical Specifications
- Amperage Rating: 100 A
- Box Size: C1
- Bus Material: Aluminum
- Catalog Notes: Listed for use as service entrance equipment and shipped with a neutral bonding strap preattached,
- Certifications: UL 67
- Cover Type: Cover included
- Enclosure: NEMA 1
- Enclosure Material: Galvanized steel
- Interrupt Rating: 10 kAIC
- Main Circuit Breaker: BR
- Mounting Method: Combination
- Nema Rating: NEMA 1
- Number Of Circuits: 24
- Number Of Spaces: 12
- Number Of Wires: 4
- Phase: Three-phase
- Product Details: Main circuit breaker
- Product Height: 21 in
- Product Length Depth: 3.88 in
- Product Weight: 23 lb
- Product Width: 14.31 in
- Special Features: No feed-thru lugs
- Used With: Type BR 1-inch breakers
- Voltage Rating: 208Y/120, 240V
- Wire Size: #4-1/0 AWG Cu/Al
Professional Applications
- Commercial Buildings and Office Complexes
- Light Industrial Facilities
- Multi-Unit Residential Properties
- Retail and Service Establishments
- Educational and Healthcare Facilities
- Professional Service Centers
- Mixed-Use Developments
Why Choose Eaton Quality?
Eaton BR Series loadcenters deliver proven reliability with UL 67 certification and robust galvanized steel construction. The combination mounting method and comprehensive wire size compatibility from #4-1/0 AWG Cu/Al ensures versatile installation options while maintaining professional performance standards for demanding three-phase applications.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 100 A
- Box Size:
- C1
- Bus Material:
- Aluminum
- Certifications:
- UL 67
- Cover Type:
- Cover included
- Configuration:
- NEMA 1
- Enclosure Material:
- Galvanized steel
- Interrupt Rating:
- 10 kAIC
- Main Circuit Breaker:
- BR
- Mounting Method:
- Combination
- Nema Rating:
- NEMA 1
- Number Of Circuits:
- 24
- Number Of Spaces:
- 12
- Number Of Wires:
- 4
- Phase:
- Three-phase
- Product Details:
- Main circuit breaker
- Product Height:
- 21 in
- Product Length Depth:
- 3.88 in
- Product Weight:
- 23 lb
- Product Width:
- 14.31 in
- Special Features:
- No feed-thru lugs
- Used With:
- Type BR 1-inch breakers
- Voltage Rating:
- 208Y/120, 240V
- Product Size:
- #4-1/0 AWG Cu/Al
- Department:
- Electrical
- Product Type:
- Load Center
- Product Group:
- Load Centers & Panel Boards
Eaton 3BR1224B100 – Frequently Asked Questions
1) Will an Eaton 3BR1224B100 loadcenter work on a 208Y/120V three-phase service?
Yes. The Eaton BR Series 3BR1224B100 is a three-phase, 4-wire panel rated 208Y/120 and 240V, so it lands on a wye 208Y/120 service with a neutral and a ground, and it also takes a 240V three-phase supply. The 4-wire configuration is what lets you pull 120V single-pole circuits off the phases as well as three-phase loads. Main breaker is 100A.
2) Does 12-space 24-circuit mean I actually get 24 breaker positions in the Eaton 3BR1224B100?
You get 12 physical full-size spaces, and 24 is the maximum circuit count you reach by using tandem breakers in those spaces. The panel takes Type BR 1-inch breakers. If every load is a full-size single-pole, three-pole, or two-pole breaker, plan around 12 spaces, not 24. Three-pole breakers eat three spaces each, so a panel feeding several three-phase loads fills up fast.
3) What breakers fit an Eaton BR three-phase loadcenter?
Type BR 1-inch breakers, Eaton's own classified BR line. That is the interior bus stab pattern, so a Cutler-Hammer CH breaker will not seat in it and neither will another manufacturer's 1-inch breaker unless it is specifically listed as BR-compatible. On the three-phase bus, single-pole BR breakers land on whichever phase that stab sits on, and balancing across A, B and C is on you at install.
4) Can the Eaton 3BR1224B100 be used as service entrance equipment?
Yes, it is listed for service entrance use and ships with the neutral bonding strap already attached, so the neutral-to-ground bond is made at the panel without a separate kit. If you are installing it downstream as a subpanel instead, that strap has to come out and neutrals and grounds get separated onto isolated bars. The panel is UL 67 listed.
5) What size feeder conductors land on the main lugs of a 100A Eaton BR three-phase panel?
The main terminals accept #4 through 1/0 AWG, copper or aluminum. That covers the usual 100A feeder choices, 1/0 aluminum or #3/#2 copper depending on your termination temperature rating and derating. Anything larger than 1/0 does not land here, so if your design calls up-size for voltage drop on a long run, check the conductor against that 1/0 ceiling before you order.
6) Will an Eaton 3BR1224B100 panel fit in my wall cavity or on a surface?
The enclosure measures 21 x 14.31 x 3.88 inches and uses combination mounting, so it goes in flush or surface without a different box. At 14.31 inches wide it will not drop between studs on standard 16-inch centers without cutting, so flush work usually means framing the opening. Depth is 3.88 inches, which clears a 2x4 wall. It weighs 23 lb, a one-person hang.
7) Is a 10 kAIC panel enough fault current rating for my commercial service?
The BR three-phase loadcenter carries a 10 kAIC interrupt rating. On a small 208Y/120 commercial or multi-family service fed from a modest transformer that is typically adequate, but you need the available fault current at the panel location from your utility or the engineer's short circuit study. If the calculated available fault current exceeds 10 kA, this panel is the wrong choice and the job needs a higher AIC panelboard or series-rated protection ahead of it.
8) Is a NEMA 1 loadcenter OK outdoors or in a wet mechanical room?
No. NEMA 1 is indoor, dry location only, general purpose enclosure protecting against incidental contact and falling dirt. The galvanized steel box gives corrosion resistance but no water protection. For an exterior wall, a parking structure, a wash-down area or anywhere subject to rain or hose spray, you need a NEMA 3R rated loadcenter instead. Indoor electrical rooms, back-of-house, corridors and utility closets are where this one belongs.
9) Can I feed a second panel through the Eaton 3BR1224B100?
No. This one has no feed-thru lugs, so you cannot pass the service through it to a downstream panel from the main terminals. To feed another panel you run a three-pole BR branch breaker in one of the 12 spaces and take the feeder from there, sized to that breaker. Plan the three spaces that breaker consumes into your circuit count.
10) Does the Eaton 3BR1224B100 come with a cover, or do I order the trim separately?
The cover is included, so there is no separate trim or door to specify. Because mounting is combination, the same cover works whether you set the panel flush or surface mount it. What is not included is breakers: the 100A BR main is part of the panel, but every branch breaker is ordered separately as Type BR 1-inch.
11) Should I use a main breaker loadcenter or a main lug panel for a 100A three-phase feed?
The 3BR1224B100 is a main breaker panel, meaning the 100A overcurrent device and the service disconnect are built in. That is what you want when this is the service entrance or when code requires a disconnecting means at the panel. A main lug panel has no main device and relies on an upstream breaker for protection, which suits a subpanel already protected by the feeder breaker. Pick the main breaker version if you want a single local shutoff for the whole panel.
12) Is aluminum bus a problem in an Eaton BR loadcenter?
No. The bus is aluminum, which is standard construction across BR Series loadcenters and is what the UL 67 listing covers. Where it does matter is at terminations: the main lugs are rated for both copper and aluminum conductors from #4 to 1/0 AWG, and torquing those terminations to spec at install is what keeps an aluminum connection tight over time.
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Does the Eaton 3BR1224B100 come with a warranty?
Absolutely. The Eaton 3BR1224B100 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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