Eaton 1MTB800R MTB Series 800A...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,000.00
$688.79
Eaton MTB Main Terminal Box, NEMA 3R - side profile view showing sheet-metal enclosure body and recessed latch pocket

Eaton 1MTB800R MTB Series 800A Main Terminal Box, NEMA 3R

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Model: 1MTB1200RC
$1,000.00
$688.79

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,000.00
$688.79
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Eaton 1MTB800R MTB Series 800A Main Terminal Box, NEMA 3R

The Eaton 1MTB800R is a top/bottom feed Main Terminal Box from the MTB Series, engineered for outdoor and service entrance electrical distribution at an 800A rating. The MTB Series platform spans 400A, 600A, 800A, 1200A, 1600A, and 2000A ratings in single-phase and three-phase configurations, with a choice of NEMA 3R weatherproof or standard enclosure construction. This unit ships with phase and neutral lugs included, and installers can select standard or copper bus material to match the application, making it a dependable solution for residential, commercial, and industrial service work. The NEMA 3R enclosure rating means this unit is built to resist rain, sleet, and ice formation, making it well suited to exposed outdoor service entrance locations where a standard indoor enclosure would not hold up. Contractors sourcing terminal boxes for panel feeds, generator connections, or service entrance upgrades will find the 1MTB800R configured for immediate installation, with box lug kit and compression lug accessories available to expand conductor termination options as job requirements dictate. Electrical contractors value the flexibility of the MTB Series lineup because a single platform covers a wide amperage span, letting a distributor stock one family of boxes while matching each job's exact current draw and phase configuration, whether that's a single-phase residential service upgrade or a three-phase industrial feed. With top/bottom feed routing, crews have latitude in how conduit approaches the enclosure, simplifying both new construction runs and retrofit tie-ins where existing conduit paths dictate the connection point.

Key Features

  • Amperage Rating: 800A rating from the MTB Series lineup, which also spans 400A, 600A, 1200A, 1600A, and 2000A to match distribution requirements.
  • Phase Configurations: Offered in single-phase and three-phase versions for residential, commercial, and industrial service.
  • NEMA 3R Enclosure Option: Weather-resistant housing protects internal phase and neutral connections against rain, sleet, and ice formation for reliable outdoor operation.
  • Included Phase and Neutral Lugs: Complete connection hardware ships in the box, supporting immediate installation without sourcing separate lug kits.
  • Top/Bottom Feed Design: Accommodates varied conduit routing and installation layouts for new construction and retrofit projects.
  • Bus Material Options: Standard bus or copper bus, selectable at order to suit conductivity and application requirements.
  • Accessory Options: Box lug kit and compression lug accessories available as add-on selections for expanded conductor termination needs.

Certifications & Compliance

  • NEMA 3R Weatherproof Enclosure Option

Technical Specifications

  • Product Type: Main Terminal Box
  • Configuration: NEMA 3R; Standard
  • Amperage Rating: 800A
  • Bus Material: Standard or Copper (selectable)

Typical Applications

  • Residential and Commercial Electrical Service Distribution
  • Industrial Facility Electrical Connections
  • Outdoor and Service Entrance Applications
  • Generator Connection Points

Why Eaton?

Eaton MTB Series terminal boxes combine included phase and neutral lug hardware with configurable enclosure, phase, amperage, and bus material options, giving contractors the flexibility to match exact service entrance requirements at ratings like this 800A unit. The NEMA 3R enclosure option delivers weather-resistant protection for outdoor installations, supporting dependable, code-compliant performance for professional electrical work backed by Eaton's reputation for durable power distribution equipment. For contractors managing service entrance upgrades, generator tie-ins, or new panel feeds, the 1MTB800R offers an 800A solution ready to install with included lugs and expandable via optional box lug kits and compression lug accessories.

Manufacturer Resources

Product Specs

Configuration:
NEMA 3R; Standard
Feed Type:
Top/bottom
Department:
Electrical
Product Group:
Power Distribution
Product Type:
Cable Lug
Product Subgroup:
Panelboards & Load Centers

Eaton 1MTB1200RC – Frequently Asked Questions

1) Can the Eaton MTB main terminal box be mounted outdoors at a service entrance?
Order it with the NEMA 3R enclosure option and it is built for outdoor service entrance work, protecting the phase and neutral connections against rain, sleet and ice. The standard enclosure option is the other choice on that axis and is meant for indoor or protected locations. Both are the same MTB box otherwise, so the enclosure selection is the decision that determines where you can hang it.
2) What amperage ratings does the Eaton MTB main terminal box come in?
Six ratings cover the range: 400A, 600A, 800A, 1200A, 1600A and 2000A. Size the box to the service ampacity it is terminating, not to the conductor count, since the same box configuration spans single-phase and three-phase at each rating. If your service is above 2000A, the MTB is not the box for it.
3) Do I have to buy lugs separately for an Eaton MTB terminal box?
No. Phase and neutral lugs ship in the box, so the standard configuration lands conductors without a separate lug kit. Two lug accessories are selectable at order if you need something different: a box lug kit or a compression lug. Pick compression lugs when your conductors are being terminated with crimped connectors rather than set screws.
4) Can conduit enter the Eaton MTB box from the top and the bottom?
The MTB is a top/bottom feed box, so it takes conduit routed in from above or below. That covers the usual service entrance case of a riser down from a weatherhead as well as a feed up from below grade, and it is why the same box works on both new construction and retrofit where the existing conduit run is fixed.
5) What is a main terminal box actually for, and do I need one instead of a panelboard?
A main terminal box is a landing point, not a distribution device. The MTB gives you an enclosure with phase and neutral lugs to terminate and splice service conductors, feed a generator connection, or transition a run; it has no breakers and does not distribute circuits. If you need overcurrent protection or branch circuits, you need a panelboard or switchboard, and the MTB sits ahead of or alongside it.
6) Is there a three-phase version of the Eaton MTB main terminal box?
Yes, three-phase and single-phase are both offered, and phase is chosen independently of amperage and enclosure. For a 208Y/120 or 480Y/277 commercial service you want the three-phase configuration; single-phase covers 120/240 residential and light commercial services.
7) Should I order the Eaton MTB with copper bus or standard bus?
Bus material is a selection at order: copper bus or standard. Copper is what to specify when a project spec or an engineer's drawing calls out copper bus, which is common on institutional and industrial jobs. If the spec is silent, the standard bus configuration is the default. Both are available across the amperage range.
8) Can I use an Eaton MTB terminal box as a generator connection point?
Generator connection is one of the applications the MTB is configured for. The included phase and neutral lugs give you a terminated landing for generator feeders inside a single enclosure, and with the NEMA 3R option the box can sit outside next to a pad-mounted set. Match the amperage rating to the generator output, up to the 2000A top of the range.
9) How many configurations of the Eaton MTB do I have to specify when ordering?
Five choices define the part: amperage (400A through 2000A), phase (single or three), enclosure (NEMA 3R or standard), bus material (standard or copper), and the accessory selection (standard, box lug kit, or compression lug). Get all five right and the box arrives with its phase and neutral lugs ready to land conductors.
How fast can I get the Eaton 1MTB1200RC delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Eaton 1MTB1200RC come with a warranty?
Absolutely. The Eaton 1MTB1200RC is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Eaton 1MTB1200RC?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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