Eaton 3MTBE400R Main Terminal Box - UL Listed
Part Number: 3MTBE400R
Quick Summary
Eaton 3MTBE400R main terminal box provides centralized, high-capacity terminations for 400A feeders in industrial and commercial buildings. Space constraints, wiring complexity, and weather exposure challenge projects, and this design addresses them with rugged construction and flexible mounting. UL Listed, EUSERC-compliant, and a NEMA 3R enclosure support reliable performance in harsh environments. This enclosure enhances power distribution with top/bottom feed capability and copper bus options, delivering scalable, maintainable solutions for facility upgrades and new installations.
Product Information
Extended Description
3MTBE400R Eaton: Eaton main terminal box, Riser box, 400A, Copper, NEMA 3R, Overhead/underground, Three-wire, Single-phase, 120/240V, Crimp lug landing pads (no lugs included)
Product Name
Eaton main terminal box
Catalog Number
3MTBE400R
UPC
782113965420
Product Length/Depth
25.875 in
Product Height
61 in
Product Width
11.875 in
Product Weight
150 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Compliances
EUSERC Approved
Certifications
UL Listed
Catalog Notes
Indoor or outdoor. Terminal box UL listed short-circuit rating is the least AIC rating of any installed main tenant breaker-to a maximum of 100,000 rms symmetrical amperes. For top feed, use Myer type hub
Type
EUSERC
Amperage Rating
400A
Bus material
Aluminum
Feed type
Top/bottom
Phase
Three-phase
Voltage rating
120/208 V
Wire size
Crimp lug landing pads (no lugs included)
Utility approvals
ID : Idaho Power OR : Idaho Power WA : Seattle City Light AK : Anchorage Municipal Light & Power NV : NV Energy CA : City of Los Angeles - DWP (LADWP) AZ : Southern California Edison CA : Southern California Edison CA : Pacific Gas and Electric (PG&E) CA : Sacramento Municipal Utility District (SMUD) WA : Puget Sound Energy WA : Tacoma Public Utilities
Enclosure
NEMA 3R
Number of wires
4
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MTBE400R
The 400A aluminum bus delivers high current capacity with low voltage drop, improving efficiency and enabling reliable feeder terminations for commercial and light industrial applications. This NEMA 3R enclosure is suitable for indoor or outdoor installations, providing weather resistance and broad environmental compatibility to reduce maintenance cycles and downtime. Top/bottom feed flexibility simplifies routing and reduces conduit runs during project setup, speeding installation and lowering labor costs. UL Listed and EUSERC compliance support regulatory acceptance and utility interconnect requirements, helping projects pass inspections more quickly. Crimp lug landing pads are included, offering a ready termination surface for copper conductors while keeping lug components optional to match site needs. The 4-wire, 120/208V, three-phase configuration ensures compatibility with common commercial loads, aiding standardization across facilities and future expansions. A one-year Eaton warranty (policy 25-000) provides asset protection and predictable maintenance budgeting, aiding procurement planning and total cost of ownership.
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FAQs
The 3MTBE400R uses a NEMA 3R enclosure designed for indoor and outdoor use, providing weather resistance and rugged performance. With UL Listed and EUSERC compliance, it supports outdoor feeder terminations for 400A three-phase systems, and its top/bottom feed capability simplifies mounting and routing in yard or rooftop installations.
Crimp lug landing pads are included on the enclosure, enabling ready copper terminations, but actual lugs are not provided. This allows you to select compatible lugs to match your conductor size and insulation, giving you flexibility to tailor termination hardware to site standards and cost goals.
Yes. The product is UL Listed and meets EUSERC requirements, with additional utility approvals noted for several regions. This helps streamline utility interconnections and project approvals, reducing risk during commissioning and helping satisfy code and utility standards for commercial and light industrial projects.
The 3MTBE400R supports top and bottom feed, aluminum bus construction, four-wire configurations, and 120/208V three-phase service. It is suitable for overhead or underground feeders and accommodates indoor or outdoor installations, simplifying site planning, routing, and future expansion.
Eaton provides a one-year warranty per policy 25-000 from installation or 18 months from shipment, whichever comes first. This coverage supports maintenance budgeting and provides assurance for asset reliability, with access to Eaton’s technical support and specifications for ongoing servicing.