Eaton 3MTB600RC Main Terminal Box - UL Listed
Part Number: 3MTB600RC
Quick Summary
The Eaton 3MTB600RC Main Terminal Box provides 600 A bus termination for three-phase power distribution in industrial facilities. Many engineers struggle with space, corrosion protection, and maintenance access when locating large terminals in overhead or underground feeders. This unit pairs UL Listed safety with a rugged NEMA 3R enclosure and utility-approval support to ease code compliance across regions. Beyond compliance, it offers flexible top/bottom feed, copper bus, and compatible lug landings that translate into faster installs and lower lifecycle costs. Designed for 120/208 V three-phase systems, it accommodates two 250-500 kcmil conductors per phase and carries a 600 A rating with reliable copper bus. UL Listed and NEMA 3R-rated with utility approvals like ConEd and Dominion help streamline procurement and field acceptance.
Product Information
Extended Description
3MTB600RC Eaton: Eaton Main Terminal Box, 600A, Copper, NEMA 3R, Overhead/underground, Four-wire, Three-phase, 120/208V, (2) 250-500 kcmil
Product Name
Eaton main terminal box
Catalog Number
3MTB600RC
UPC
782114556146
Product Length/Depth
6.5 in
Product Height
8 in
Product Width
13.5 in
Product Weight
55 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.
Certifications
UL Listed
Catalog Notes
For compression lug Landing kits, order 3MTB600CLK (includes landings for 3 phases and neutral).
Amperage Rating
600A
Bus material
Copper
Feed type
Top/bottom
Phase
Three-phase
Voltage rating
120/208 V
Wire size
(2) 250-500 kcmil
Utility approvals
NY : Consolidated Edison (ConEd) NC : Dominion VA : Dominion MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy
Enclosure
NEMA 3R
Number of wires
4
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MTB600RC
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: 600 A copper bus delivers high-current capacity with low resistance. Business impact: Lower voltage drop means improved motor and equipment performance and reduced energy waste in large feeders. Application: Perfect for three-phase distributions in manufacturing plants and data centers. Feature: NEMA 3R enclosure provides weather-resistant protection for outdoor and exposed installations. Business impact: Enhances reliability in rain, dust, and washdown environments, reducing maintenance downtime. Application: Suitable for outdoor or exposed installations where protection and accessibility matter. Feature: Top/bottom feed and four-wire configuration for service flexibility. Business impact: Facilitates versatile installation and simplifies routing in tight electrical rooms, saving time on site. Application: Supports systems at 120/208 V with two cables of 250-500 kcmil per phase. Feature: Compatible compression lug landing kits (3MTB600CLK) simplify field terminations. Business impact: Reduces installation steps and ensures a solid, code-compliant lug land. Application: Use in projects requiring lug land assemblies and modular expansion. Feature: UL Listed safety rating and utility approvals (ConEd, Dominion) streamline procurement and commissioning. Business impact: Improves regulatory confidence and speeds project sign-off. Application: Ideal for utility-backed projects and multi-site deployments across regions.
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FAQs
The 3MTB600RC is rated for two conductors per phase sized 250-500 kcmil, with top or bottom feed options to align with cabinet layout. The copper bus minimizes impedance, supporting reliable operation under full-load conditions. Plan for four wires total and ensure appropriate clearance per applicable codes.
Key specs include a 600 A amperage rating, copper bus, 120/208 V three-phase operation, four wires, (2) 250-500 kcmil conductors, and a NEMA 3R enclosure. Catalog number is 3MTB600RC, UPC 782114556146, weight approximately 55 lb, and dimensions 13.5 in W Ă— 8 in H Ă— 6.5 in D. UL Listed.
Yes. The NEMA 3R enclosure provides weather resistance for outdoor and exposed installations, and UL Listing confirms compliance with safety standards. It supports overhead and underground feeder configurations in industrial facilities, with utility approvals from ConEd and Dominion facilitating procurement and field acceptance.
For lug landings, use the 3MTB600CLK compression lug kit, which matches the footprint of the 3MTB600RC and streamlines field terminations. It reduces installation time, ensures compliant torque values, and supports reliable, code-approved connections in four-wire, three-phase applications.
Warranty coverage follows Eaton Selling Policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This protects against manufacturing defects and performance deviation. For service, contact Eaton support or your distributor and retain the catalog number and UPC for reference.