Eaton BR Series Main Breaker L...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$9,642.49
Eaton BR Series Main Breaker Loadcenter, 400A, 42-Circuit, Aluminum Bus

Eaton BR Series Main Breaker Loadcenter, 400A, 42-Circuit, Aluminum Bus

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Model: 3BR4242B400S

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

$9,642.49
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Eaton BR Series Main Breaker Loadcenter, 400A, 42-Circuit, Aluminum Bus

The Eaton BR Series Main Breaker Loadcenter is a three-phase main circuit breaker loadcenter rated 400 A, built with an aluminum bus and housed in a NEMA 1 surface-mount enclosure. Featuring the BWH main circuit breaker and 42 circuit spaces (42 circuits), this loadcenter is engineered for demanding power distribution in commercial and light industrial settings. It carries a 22 kAIC interrupt rating and is UL Listed (file E52977) for dependable, code-compliant performance.

Key Features

  • Amperage Rating: 400 A main circuit breaker for high-capacity power distribution.
  • Durable Construction: Aluminum bus material for reliable current-carrying performance.
  • Main Circuit Breaker: BWH main breaker provides centralized disconnect and overcurrent protection.
  • Configuration: 42 circuit spaces (42 circuits) to accommodate extensive branch-circuit wiring.
  • Three-Phase Design: Configured for three-phase electrical systems.
  • Interrupt Rating: 22 kAIC for robust fault-current handling.
  • Mounting & Enclosure: Surface-mount NEMA 1 enclosure suited for indoor installations.
  • Factory Options: Available with factory-integrated surge protection; no feed-thru lugs.

Certifications & Compliance

  • UL Listed, file E52977
  • NEMA 1 Enclosure Rating

Technical Specifications

  • Number of spaces: 42
  • Product Type: Load Center
  • Number of circuits: 42
  • Warranty: 10 year limited
  • Main circuit breaker: BWH

Typical Applications

  • Commercial and Light Industrial Electrical Installations
  • Main Power Distribution and Load Centers
  • Panelboard and Branch-Circuit Wiring
  • Three-Phase Electrical Systems
  • New Construction and Facility Upgrades

Why Eaton?

Eaton's BR Series loadcenters combine an aluminum bus, a 400 A BWH main circuit breaker, and a 22 kAIC interrupt rating in a UL Listed, NEMA 1 enclosure backed by a 10 year limited warranty. Built for three-phase power distribution, this loadcenter delivers the reliability and code-compliant performance professional electricians expect from Eaton.

Manufacturer Resources

Product Specs

Product Width:
19 in
Amperage Rating:
400A
Product Length/Depth:
58 in
Number Of Spaces:
42
Product Height:
7.5 in
Product Type:
Load Center
Phase:
Three-phase
Number Of Circuits:
42
Warranty:
10 year limited
Main Circuit Breaker:
BWH
Mounting Method:
Surface
Option Details:
Factory integrated surge, No feed thru lugs
Interrupt Rating:
22 kAIC
Bus Material:
Aluminum
Nema Rating:
NEMA 1
Configuration:
42-Circuit
Certifications:
UL Listed file E52977
Department:
Electrical
Product Material:
Aluminum
Standards:
NEMA 1
Listing:
UL Listed
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers
Product Length:
58 in
Product Weight:
76.25 lb

Eaton 3BR4242B400S – Frequently Asked Questions

1) Will the Eaton 3BR4242B400S loadcenter work on a single-phase service?
No. The Eaton BR 3BR4242B400S is configured for three-phase power, so it is the wrong panel for a single-phase residential or light commercial service. If your service is three-phase, this one carries a 400A BWH main breaker and 42 circuit spaces.
2) Can this Eaton BR 400A loadcenter be installed outdoors or in a wet area?
Indoor only. The enclosure is NEMA 1, which is a general-purpose indoor rating with no protection against rain, sleet, or hose-directed water. For an exterior wall or a washdown area you need a NEMA 3R or better enclosure. It is a surface-mount cabinet, so it hangs on the wall rather than sitting flush in it.
3) Can I feed another panel downstream from this Eaton BR loadcenter?
Not through feed-thru lugs. This configuration is built with no feed-thru lugs, so a downstream panel has to be fed from a branch breaker in one of the 42 spaces, not from a lug extension off the bus. If you need a straight pass-through to a second panel, order a feed-thru version instead.
4) What breakers go in an Eaton BR loadcenter?
BR Series loadcenters take Eaton BR type plug-on branch breakers. The 400A main itself is a BWH breaker. Eaton CH type breakers are a different bus and will not seat in this panel, which is the most common mix-up when someone is restocking a truck for both panel families.
5) How much wall space do I need for the Eaton 3BR4242B400S panel?
Plan the wall for a cabinet measuring 58 x 19 x 7.5 inches. It is surface-mounted, so the full depth stands off the finished wall rather than being buried in it, and you still need NEC working clearance in front of it. The 58-inch figure is the long dimension, which matters most in a mechanical room with ductwork or piping overhead.
6) Does the Eaton BR 400A loadcenter have an aluminum or copper bus, and does it matter?
Aluminum bus. That is standard on BR Series loadcenters and it carries the full 400A rating. Where it matters is on a spec that explicitly calls for a copper bus panel, which some institutional and healthcare specifications do; in that case this panel will not pass submittal review and you need a copper-bus panelboard instead.
7) Do I need to add a separate surge protective device to this Eaton panel?
This configuration is built with factory integrated surge protection, so the SPD is part of the panel rather than a field-installed accessory hung off a breaker. That saves a two-pole space and the external mounting work an add-on device would require.
8) Does 42 circuits mean 42 usable spaces, or does the main breaker eat some of them?
42 spaces and 42 circuits, and the 400A BWH main does not consume any of them. The main is a separate main breaker section, so every one of the 42 spaces is available for branch breakers. Bear in mind that on a three-phase panel a 3-pole breaker takes three spaces, so a panel loaded with 3-pole circuits fills up faster than the space count suggests.
How fast can I get the Eaton 3BR4242B400S delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 Eaton 3BR4242B400S come with a warranty?
Absolutely. The Eaton 3BR4242B400S 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 Eaton 3BR4242B400S?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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