Eaton 1MTB800R Main Terminal - UL Listed, NEMA 3R
Part Number: 1MTB800R
Quick Summary
Eaton 1MTB800R main terminal box provides rugged, high-current distribution for underground and outdoor installations. Engineers often struggle with moisture ingress, corrosion, and space constraints in underground pull boxes, leading to downtime and costly maintenance. UL Listed safety certification and a NEMA 3R enclosure deliver reliable protection in harsh environments while meeting essential electrical codes. With an 800A capacity, aluminum bus, and a 120/240V single-phase rating, this box supports demanding feeders while maintaining a compact footprint. Top/bottom feed offers installation flexibility across utility pull boxes and industrial sites, reducing field wiring time. Designed for durable performance, it helps minimize maintenance cycles, improve uptime, and simplify procurement for contractors and utilities.
Product Information
Extended Description
1MTB800R Eaton: Eaton main terminal box, Utility pull box, 800A, Aluminum, NEMA 3R, Underground, Three-wire, Single-phase, (4) 250-500 kcmil, 120/240V
Product Name
Eaton main terminal box
Catalog Number
1MTB800R
UPC
786849053055
Product Length/Depth
11.19 in
Product Height
47.7 in
Product Width
20.17 in
Product Weight
100 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 (4) 1/0-300 kcmil or (2) 1/0-750 kcmil cables per phase, order 3MTB800BLK. For compression lug Landing kits, order 3MTB1200CLK (includes landings for 3-phases and neutral).
Amperage Rating
800A
Bus material
Aluminum
Feed type
Top/bottom
Phase
Single-phase
Voltage rating
120/240 V
Wire size
(4) 250-500 kcmil
Utility approvals
MI : Consumers Energy NC : Dominion VA : Dominion MI : DTE Energy (Detroit Edison) WI : WE Energies / Wisconsin Public Service (WPS) MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy MD : Baltimore Gas and Electric DC : PEPCO MD : PEPCO
Enclosure
NEMA 3R
Number of wires
3
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 1MTB800R
800A capacity with an all-aluminum bus delivers lower resistance and efficient heat management under full load. This translates into fewer cooling requirements and improved reliability for heavy-duty feeders in industrial campuses and underground systems. Top/bottom feed provides flexible installation in tight spaces and multiple orientations, reducing field modifications and speeding commissioning in retrofit projects and new builds. The durable NEMA 3R enclosure with UL Listed certification protects against weather, moisture, and corrosion, supporting safe outdoor and underground operation while meeting safety standards. Large conductor capacity simplifies cabling for 3-wire, single-phase service; for example, the unit supports four 250-500 kcmil conductors per phase, enabling compact, cost-effective installations. Dimensions and weight—11.19 in depth, 47.7 in height, 20.17 in width, 100 lb—contribute to robust, field-friendly mounting and reduced handling risk. Warranty and catalog support from Eaton (25-000) provide long-term maintenance confidence and predictable project budgeting.
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FAQs
The Eaton 1MTB800R is ideal for underground and outdoor power distribution, including utility pull boxes and service entrances. Its UL Listed safety certification and a NEMA 3R enclosure protect against weather, moisture, and corrosion, while the 800A aluminum bus supports high-load feeders. It accepts top or bottom feed and accommodates (4) 250-500 kcmil conductors per phase, enabling flexible, field- ready cabling layouts for industrial facilities.
The 1MTB800R accepts (4) 250-500 kcmil conductors per phase for a single-phase feed. For alternative lug configurations, Eaton provides 3MTB800BLK landing kits and 3MTB1200CLK compression lug kits that enable up to (2) 1/0-750 kcmil per phase or (4) 1/0-300 kcmil per phase, depending on your installation needs.
This terminal box is UL Listed and features a NEMA 3R enclosure, designed for outdoor and underground use. It is rated for 120/240V single-phase service with an 800A amperage rating and an aluminum bus, supporting three conductors. The product is suited for utility, commercial, and industrial installations needing rugged protection and reliable performance.
By combining a durable aluminum bus and NEMA 3R UL Listed enclosure, the 1MTB800R reduces maintenance and replacement costs in harsh environments. The top/bottom feed promotes faster installation, while the high-current rating minimizes the need for intermediate switching gear. Long-term reliability translates to fewer service calls and predictable budgeting for underground and outdoor feeders.
Warranty terms follow Eaton policy 25-000: one year from the date of installation or eighteen months from the date of shipment, whichever occurs first. This coverage supports commissioning and early-life maintenance and is complemented by Eaton's technical support and catalog notes for field-lugging and accessory compatibility.