Eaton 3BR4242L400R Main Lug Loadcenter - NEMA 3R
Part Number: 3BR4242L400R
Quick Summary
Eaton BR main lug loadcenter delivers reliable power distribution for commercial and light-industrial panels. The unit addresses common field challenges such as space constraints, downtime from fault events, and evolving load profiles. With a 400 A rating, aluminum bus, and three-phase capability, it supports scalable branch circuits while maintaining robust protection. The enclosure carries UL Listed certification (E52977) and UL 67 and a NEMA 3R rating, enabling installation in both indoor and outdoor environments. Surface mounting simplifies integration into existing enclosures and reduces installation time. By combining surge protection with a 42-circuit framework, this loadcenter helps reduce maintenance costs and improve system uptime for critical facilities.
Product Information
Extended Description
3BR4242L400R Eaton: Eaton BR main lug loadcenter,Main lug,400 A,Aluminum,NEMA 3R,Surface,NEMA 3R,42 Circuits,42 Spaces,Factory integrated surge, No feed thru lugs,Three-phase
Product Name
Eaton BR main lug loadcenter
Catalog Number
3BR4242L400R
UPC
786685895369
Product Length/Depth
57 in
Product Height
7 in
Product Width
19 in
Product Weight
73 lb
Warranty
10 year limited
Certifications
UL Listed file E52977 UL 67
Type
Main lug
Amperage Rating
400 A
Bus material
Aluminum
Mounting
Surface
Number of circuits
42
Number of spaces
42
Options
Factory integrated surge, No feed thru lugs
Phase
Three-phase
Enclosure
NEMA 3R
NEMA rating
NEMA 3R
Residential and Light Commercial, Load centers and Circuit Breakers, Volume 1 Tab 1
Eaton Specification Sheet - 3BR4242L400R
Eaton type BR circuit breaker limited warranty June 2024
Feature → 400 A main lug capacity with aluminum bus. Business Impact → Supports high-load distribution with corrosion resistance and lower thermal rise, improving long-term reliability. Application → Ideal for service upgrades in manufacturing, HVAC, and data centers where heavy-duty three-phase distribution is needed. Feature → NEMA 3R enclosure with surface mounting. Business Impact → Enables outdoor or damp-location installations and faster retrofits, reducing installation risk and time. Application → Suitable for exterior electrical rooms, weather-protected zones, and high-traffic facilities. Feature → 42 circuits and 42 spaces. Business Impact → Provides ample headroom for future expansion without panel redesign, lowering total cost of ownership. Application → Power distribution in commercial offices, light industrial spaces, and large machinery environments. Feature → Factory integrated surge protection and no feed-thru lugs. Business Impact → Enhances fault and surge resilience while simplifying wiring, reducing field labor and maintenance. Application → Critical-load protection for motors, drives, and sensitive electronics in manufacturing lines. Feature → UL Listed (E52977, UL 67) and Three-phase NEMA 3R readiness with a 10-year warranty. Business Impact → Compliance-ready with predictable performance and long-term support, lowering risk in audits and uptime guarantees. Application → Regulated environments and facilities requiring documented protection and service life expectancy.
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FAQs
The 3BR4242L400R is designed as a BR main lug loadcenter and provides a compatible footprint for BR-series components. When upgrading, verify bus material and mounting compatibility, ensure proper labeling, and confirm that the panel’s enclosure rating and current rating align with your system design. Always consult the Eaton specification sheet for confirmation of breaker compatibility and installation guidance.
This unit features a NEMA 3R enclosure, which provides rain and ice protection for outdoor or damp environments. Its surface-mount design supports easy retrofits in existing facilities, and the aluminum bus offers corrosion resistance, helping to maintain performance in challenging conditions. For outdoor installations, ensure proper weatherproofing around the enclosure and compliant cable entry methods.
Key specs include a 400 A amperage rating, three-phase configuration, aluminum bus material, 42 circuits, and 42 spaces. The enclosure is UL Listed (E52977, UL 67) and rated NEMA 3R. Consider space constraints, current load calculations, the need for surge protection, and whether surface mounting aligns with your panel layout. Review the Eaton data sheet for detailed terminal and wiring requirements.
Factory integrated surge protection centralizes transient protection at the point of distribution, reducing the risk of equipment damage and nuisance trips. For facilities with sensitive electronics and variable loads, this translates to lower maintenance costs, less unplanned downtime, and easier compliance with reliability standards. It also minimizes field installation steps and potential wiring errors.
The ROI comes from improved reliability, reduced field labor for wiring and surge protection, and faster panel upgrades thanks to standard BR-compatible components. With 42 circuits and a robust 400 A capacity, the unit supports projected load growth while maintaining protective features and compliance. Businesses benefit from lower downtime, extended equipment life, and predictable maintenance budgeting.