Eaton 3MTB1200RC Main Terminal Box - NEMA 3R UL Listed
Part Number: 3MTB1200RC
Quick Summary
The Eaton main terminal box is a high-capacity solution for 1200A three-phase power distribution in industrial facilities. This rugged unit addresses common challenges like handling large copper bus, space constraints, and outdoor exposure by offering straightforward top/bottom feed access and a robust enclosure. With UL Listed certification and a NEMA 3R rating, it provides dependable performance in both indoor and outdoor environments while resisting weather, dust, and moisture. The box supports a four-wire, 120/208V configuration and accepts two 250–500 kcmil conductors per phase, making it ideal for demanding service feeders. Pair it with compatible lug kits to streamline installation and improve system reliability across your facility.
Product Information
Extended Description
3MTB1200RC Eaton: Eaton main terminal box, 1200A, Copper, NEMA 3R, Overhead/underground, Four-wire, Three-phase, 120/208V, (2) 250-500 kcmil
Product Name
Eaton main terminal box
Catalog Number
3MTB1200RC
UPC
782114632178
Product Length/Depth
11.19 in
Product Height
47.7 in
Product Width
11.19 in
Product Weight
200 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 3MTB1200CLK (includes landings for 3-phases and neutral).
Amperage Rating
1200A
Bus material
Copper
Feed type
Top/bottom
Phase
Three-phase
Voltage rating
120/208 V
Wire size
(2) 250-500 kcmil
Utility approvals
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 - 3MTB1200RC
Amperage rating of 1200A with a copper bus supports large feeders with minimal voltage drop and efficient heat dissipation, enabling reliable power distribution in manufacturing floors and data centers. Top/bottom feed, four-wire configuration, and wire size tolerance of (2) 250-500 kcmil provide flexible installation and reduced field splicing, cutting project time and risk. A NEMA 3R enclosure paired with UL Listed certification delivers weather-resistant performance for outdoor locations, lowering maintenance costs and extending service life in harsh environments. The catalog option 3MTB1200CLK for compression lug landing kits simplifies field terminations, accelerating installation while improving safety and connection integrity. A solid 200 lb construction signals durable fabrication, minimizing vibration-related issues and reinforcing long-term reliability in industrial settings. This product also supports overhead/underground utility configurations, enhancing adaptability across facilities.
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FAQs
For installation, plan for a top or bottom feed configuration and prepare space for two 250-500 kcmil lugs per phase. Use the 3MTB1200CLK lug landing kit when installing compression lugs to simplify terminations. The unit weighs about 200 lb, so secure mounting on a stable base and use appropriate lifting equipment. This terminal box is designed for overhead or underground service in 120/208V three-phase systems and fits environments requiring NEMA 3R weather protection.
Key specs include a 1200A Amperage Rating with copper bus, four wires, and a 120/208V three-phase configuration. The enclosure supports (2) 250-500 kcmil conductors, with top/bottom feed capability to streamline routing from feeders. This combination is ideal for high-current distribution in industrial plants and commercial facilities that require durable, low-impedance connections and reliable performance under load.
Yes. The 3MTB1200RC is designed for overhead and underground service, featuring a NEMA 3R enclosure for weather resistance and UL Listed certification for reliability in harsh environments. Its copper bus and robust construction are optimized for long-term operation in outdoor substation-like settings and indoor electrical rooms where four-wire, three-phase distribution is required.
The Eaton 3MTB1200RC carries UL Listed certification and a NEMA 3R enclosure rating, ensuring safety and outdoor suitability. It also aligns with utility-grade expectations for durable main terminations in demanding service feeds. For landings and modular upgrades, refer to compatible accessories such as lug landing kits to maintain compliant terminations throughout the life of the installation.
The 3MTB1200RC delivers long-term value through a heavy-duty copper bus, rugged NEMA 3R enclosure, and UL Listed compliance, reducing maintenance and downtime. Its top/bottom feed flexibility and compatibility with lug landing kits shorten installation time, lowering labor costs. Although the unit is heavy, the solid construction minimizes field service interruptions and improves system reliability for critical feeders in manufacturing, data centers, and large facilities.