Eaton 3MTB1600RCRIS Main Terminal Box - NEMA 3R
Part Number: 3MTB1600RCRIS
Quick Summary
The Eaton main terminal box 3MTB1600RCRIS provides a rugged, high-capacity power termination point for large facilities. For engineers facing crowded equipment rooms and complex wiring, this unit streamlines space planning and reduces installation time. UL Listed and NEMA 3R rated, it’s built for reliable overhead and underground service, with copper bus rated to 1600A and three-phase 120/208V operation. The design supports top and bottom feed, four-wire configurations, and cataloged lug options to simplify expansion and future upgrades. With Eaton’s warranty and documented installation guidance, it delivers predictable performance, lower maintenance costs, and long-term value for critical power distribution.
Product Information
Extended Description
3MTB1600RCRIS Eaton: Eaton main terminal box, 1600A, Copper, NEMA 3R, Overhead/underground, Four-wire, Three-phase, 120/208V, (6) 500 kcmil
Product Name
Eaton main terminal box
Catalog Number
3MTB1600RCRIS
UPC
786685632780
Product Length/Depth
11.646 in
Product Height
60.575 in
Product Width
28.48 in
Product Weight
202 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 1600A units, to obtain (40) 750 kcmil cables per-phase- order catalog number 3MTB1600BLK, one lug per main terminal box ordered. For 1600A units compression lug landing kit, order catalog number 3MTB1600CLK.
Type
Riser box
Amperage Rating
1600A
Bus material
Copper
Feed type
Top/bottom
Phase
Three-phase
Voltage rating
120/208 V
Wire size
#2 AWG-750 kcmil
Enclosure
NEMA 3R
Number of wires
4
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MTB1600RCRIS
Selling Policy 25-000 - Distribution and Control Products and Services
1600A copper bus with top/bottom feed delivers high-current distribution with minimal I2R losses, enabling faster terminations and reduced heat in demanding facilities. This translates to shorter commissioning times and improved reliability for data centers and manufacturing lines where space is at a premium. UL Listed and NEMA 3R rated, the enclosure supports outdoor and indoor use while meeting NEC requirements for regulatory compliance. Lug options and cataloged kits simplify high-capacity cabling; the 3MTB1600BLK and 3MTB1600CLK enable per-phase landings up to 750 kcmil, reducing field termination time and errors. The unit’s weight and rugged construction promote safe handling with appropriate lifting gear, minimizing injury risk during installation. Two-person teams can achieve faster turnarounds with fewer on-site modifications, lowering lifecycle costs and downtime in critical facilities.
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FAQs
Installation is straightforward with top or bottom feed and four-wire, three-phase 120/208V connections. The 1600A copper bus accepts #2 AWG–750 kcmil conductors and requires UL-listed components for NEC compliance. For high-capacity runs, use the 3MTB1600BLK lug kit (per-phase landings up to 750 kcmil) or the 3MTB1600CLK compression lug landing kit to simplify field terminations.
Key specifications include a 1600A amperage rating, three-phase operation, and a 120/208 V voltage footprint. The copper bus supports #2 AWG through 750 kcmil conductors, and the enclosure is NEMA 3R. This model uses top or bottom feed and delivers four-wire terminations, making it compatible with common commercial and industrial distribution schemes while meeting UL Listed standards.
Yes, the 3MTB1600RCRIS is designed for both outdoor and indoor use in rugged environments. Its NEMA 3R enclosure handles weather exposure and the overhead/underground service configuration suits substations and industrial plants. The 1600A copper bus delivers reliable power for critical loads, while the UL Listed construction ensures compliance with applicable codes and reduces project risk.
UL Listed and NEMA 3R rated, the 3MTB1600RCRIS is designed to meet NEC and industry standards for high-current, three-phase distribution. This certification covers the enclosure and copper bus assembly, ensuring safe terminations in varied environments. For expansion or specialty cables, follow Eaton catalog notes (BLK lug kit, CLK lug kit) to preserve compliance.
Warranty follows Eaton policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. Regular inspections and tightening of terminations per maintenance schedules, plus the use of Eaton-approved lug kits, minimize downtime. While the unit’s weight requires proper lifting, standardized components and documented catalogs reduce field rework and total cost of ownership.