Eaton 1MTB1200RC Main Terminal Box - NEMA 3R - UL Listed
Part Number: 1MTB1200RC
Quick Summary
Eaton 1MTB1200RC main terminal box provides rugged, center-fed terminations for up to 1200 A in industrial and commercial panels. End users often contend with limited lug configurations and enclosure options that slow installs and raise safety risk; this unit is designed to address those challenges with a robust aluminum enclosure and a versatile top/bottom feed arrangement. Key certifications include UL Listed and a NEMA 3R enclosure suitable for outdoor or harsh environments, helping ensure compliance and long service life. With a copper bus and precise cable terminations, the 1MTB1200RC supports reliable high-current distribution, while remaining compatible with EUSERC metering requirements and standard service equipment in many facilities.
Product Information
Extended Description
1MTB1200RC Eaton: Eaton main terminal box, EUSERC, 1200A, Aluminum, NEMA 3R, Overhead/underground, Three-wire, Single-phase, 120/240V, (4) 250-500 kcmil
Product Name
Eaton main terminal box
Catalog Number
1MTB1200RC
UPC
782114990377
Product Length/Depth
11.19 in
Product Height
47.7 in
Product Width
20.17 in
Product Weight
154 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
Must be center fed when installing 800A residential meter stacks. For (6) 1/0-300 kcmil or (3) 750 kcmil cables per phase, order 3MTB1200BLK. One Lug Kit per main terminal box ordered. For compression lug order 3MTB1200CLK.
Amperage Rating
1200A
Bus material
Copper
Feed type
Top/bottom
Phase
Single-phase
Voltage rating
120/240 V
Wire size
(4) 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
3
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 1MTB1200RC
Feature: 1200 A amperage rating with copper bus. Business Impact: Enables high-capacity service terminations with minimal voltage drop and reliable current handling for critical loads. Application: Ideal for large building feeds, metering connections, and distribution panels where space is at a premium. Long-tail keywords: 1MTB1200RC, high current terminal box, copper bus, main service distribution. Feature: Top/bottom feed design. Business Impact: Flexible wiring options streamline installation in overhead or underground installations, reducing labor time and errors. Application: Utility and commercial metering setups where routing varies by site. Long-tail keywords: top/bottom feed, installation flexibility, metering connections. Feature: NEMA 3R enclosure with UL Listed rating. Business Impact: Delivers weather resistance and regulatory compliance, lowering maintenance costs and risk. Application: Outdoor and harsh-environment installations, meter stacks, and service enclosures. Long-tail keywords: NEMA 3R enclosure, UL Listed, weather resistance. Feature: Large conductor capacity (4) 250-500 kcmil per phase. Business Impact: Supports scalable feeder configurations and future upgrades without replacing hardware. Application: Residential service feeds and industrial power distribution. Long-tail keywords: 250-500 kcmil, large conductor terminations, scalable terminations. Feature: Single-phase 120/240 V operation. Business Impact: Simplifies integration with common utility and panel standards, accelerating project timelines. Application: Service entrances and metering panels in commercial buildings. Long-tail keywords: 120/240 V, single-phase, standard utility compatibility. Feature: EUSERC-compatible and center-fed catalog notes. Business Impact: Streamlines procurement and compliance with utility standards, minimizing rework. Application: Metering stacks and utility-ready installations. Long-tail keywords: EUSERC, meter stacks, catalog note guidance.
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FAQs
The 1MTB1200RC is a 1200 A, single-phase terminal box with a copper bus designed for up to four conductors of 250-500 kcmil. It uses a top/bottom feed configuration and is UL Listed with a NEMA 3R enclosure, making it compatible with most residential and light commercial metering stacks and service panels. When planning installs, verify center-feeding requirements described in catalog notes for specific meter stacks.
The product supports both overhead and underground feeds with a center-fed option mandated for certain meter stacks, per catalog notes. For larger conductors per phase (six 1/0-300 kcmil or three 750 kcmil), Eaton recommends alternative configurations (such as 3MTB1200BLK). Plan routing to minimize bending stress on conductors and ensure proper alignment with the top/bottom feed design to optimize terminations and service reliability.
Key specs include a 1200 A amperage rating, 120/240 V voltage, copper bus material, and the ability to terminate (4) 250-500 kcmil conductors. The enclosure is NEMA 3R and UL Listed, supporting weather resistance and safety. These features collectively reduce heat buildup, improve electrical performance under high-load conditions, and support compliant, long-term operation in challenging environments.
Yes. The unit is UL Listed and designed for meter-related applications with EUSERC considerations, providing regulatory alignment for utility-ready installations. The NEMA 3R enclosure supports outdoor or harsh environments, while the copper bus and robust aluminum enclosure contribute to safe, reliable service terminations. Always reference the catalog notes for installation specifics and utility requirements.
The 1MTB1200RC enables high-current distribution with durable materials (copper bus, aluminum enclosure) and flexible wiring (top/bottom feed) that reduces upgrade frequency. Its weather-resistant NEMA 3R enclosure lowers corrosion risk in outdoor installs, while UL Listing ensures ongoing compliance. Overall, the solution minimizes maintenance costs, speeds up future expansions, and improves first-time install success for metering and service applications.