Eaton 800A Horizontal Aluminum...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,000.00
$776.03
Eaton 800A Horizontal Aluminun Bus - Group Metering

Eaton 800A Horizontal Aluminum Bus Group Metering System

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Model: 1MM520RRLB
$1,000.00
$776.03

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

$1,000.00
$776.03
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Eaton 800A Horizontal Aluminum Bus Group Metering System

Professional electrical distribution with integrated metering capabilities

The Eaton 800A Horizontal Aluminum Bus Group Metering System delivers reliable electrical distribution and monitoring for commercial and industrial applications. This UL Listed system features durable aluminum bus construction with 800A capacity and A-B phase balance configuration, providing professional-grade power distribution with integrated metering functionality for comprehensive electrical management.

Professional Features & Benefits

  • 800A Service Rating: Handles substantial electrical loads for commercial and industrial facilities with reliable capacity management.
  • Aluminum Bus Construction: Provides excellent conductivity and corrosion resistance for long-term durability in demanding environments.
  • UL Listed Certification: Meets rigorous safety and performance standards for professional electrical installations.
  • Horizontal Configuration: Optimizes space utilization and facilitates efficient installation in electrical rooms and equipment areas.
  • Group Metering Integration: Enables comprehensive monitoring and management of multiple electrical circuits from a centralized system.
  • A-B Phase Balance: Ensures proper electrical distribution and load management across phases for optimal system performance.

Technical Specifications

  • Bus Material: Aluminum
  • Certifications: UL Listed
  • Interrupt Rating: Depends on selected main circuit breaker
  • Phase Balance: A-B

Professional Applications

  • Commercial Office Buildings
  • Industrial Manufacturing Facilities
  • Multi-Tenant Properties
  • Healthcare Facilities
  • Educational Institutions
  • Retail and Shopping Centers
  • Data Centers and Technology Facilities

Why Choose Eaton Quality?

Eaton delivers proven reliability in electrical distribution systems with UL Listed certification ensuring compliance with industry safety standards. The aluminum bus construction provides superior conductivity and durability, while the integrated group metering capability offers comprehensive electrical monitoring for professional facility management.

Manufacturer Resources

Spec Sheet

Product Specs

Bus Material:
Aluminum
Certifications:
UL Listed
Interrupt Rating:
Depends on selected main circuit breaker
Phase Balance:
A-B
Department:
Electrical
Product Group:
Power Distribution
Product Type:
Meter
Product Subgroup:
Metering & Meter Sockets

Eaton 1MM520RRLB – Frequently Asked Questions

1) How many meter sockets can I get on an Eaton 1MM/3MM group metering bus, and what amperage does each socket carry?
Eaton's horizontal aluminum bus group metering assemblies come in 2, 3, 4, and 5 socket configurations, with each tenant position rated either 125A or 200A. So a five-position building at 125A per unit is a 1MM612R or 3MM612R; a four-position layout at 200A per unit is a 1MM520R or 3MM520R. Pick the socket count to match the number of metered tenants, not the number of units you might add later, since the socket count is fixed by the enclosure you buy.
2) What is the difference between the Eaton 1MM and 3MM group metering catalog numbers?
The leading digit tells you how the single-phase in and out is handled. The 3MM numbers (3MM312R, 3MM420R, 3MM520RRLB and so on) are the standard single-phase in/out arrangement. The 1MM numbers cover the case where three-phase is used instead. Both families run off the same 800A horizontal aluminum bus and are offered in the same 2 through 5 socket counts at 125A or 200A. Get this digit right on the order, because it is the service configuration, not an accessory.
3) Ring versus ringless versus horn bypass on an Eaton meter stack, which one does my utility require?
All three styles are built: ring (1MM320R), ringless (1MM320RRL), and horn bypass (1MM320RRLB). Which one you can install is decided by the serving utility, not by preference. Ring type takes a sealing ring over the meter, ringless uses a hinged cover with no ring, and horn bypass adds a bypass so the meter can be pulled without dropping the tenant's power, which is what utilities generally specify when they want live meter changes. Call the utility's meter department with the address before ordering; installing the wrong style means the meter does not get set.
4) Can an Eaton horizontal bus group metering stack be mounted outside on an exterior wall?
Yes, and the enclosure rating is part of the catalog number you choose. Every ringless and horn bypass version is outdoor rated, as are the 200A ring versions such as 1MM320R and 3MM420R. The 125A ring versions, 1MM312R, 1MM412R, 1MM512R, 1MM612R and their 3MM equivalents, are indoor/outdoor, so they cover an electrical room or an exterior wall.
5) What is the AIC short circuit rating on an Eaton 800A group metering assembly?
The interrupting rating of the assembly follows whichever main circuit breaker is selected, so it is set by the main you install rather than fixed by the meter stack itself. That means the AIC number your engineer needs on the drawing comes from the main breaker selection, and the available fault current at the service has to be checked against that breaker. The bus itself is aluminum, rated 800A, and the assembly is UL Listed.
6) Do I need a separate main breaker with an Eaton group metering stack, or is one included?
The main circuit breaker is a separate selection. The assembly's interrupting rating depends on the main circuit breaker chosen, which tells you the main is specified apart from the meter stack. Budget the main, its mounting, and the feeder conductors as part of the job, and size the main against the 800A bus and the total metered load, not against the per-socket 125A or 200A rating.
7) I need to change a tenant's meter without shutting off their power, which Eaton meter stack do I order?
Order a horn bypass version. Those are the RRLB catalog numbers, 1MM312RRLB, 1MM320RRLB, 1MM412RRLB, 1MM512RRLB, 1MM612RRLB, and the 3MM equivalents such as 3MM420RRLB. Horn bypass lets the meter be pulled and replaced with the tenant circuit still carried through the bypass. Ring and ringless versions have no bypass, so a meter swap on those means an outage for that unit. Every horn bypass version is outdoor rated.
8) Can I get a 200A per unit Eaton group metering stack with five meter sockets?
At 200A per socket the group metering assemblies run to four positions, 1MM520R, 1MM520RRL, 1MM520RRLB, 3MM520R, and 3MM520RRLB. The five socket versions, such as 1MM612R and 3MM612RRLB, are the 125A per socket configuration. So a five tenant building needing 200A services per unit does not land on a single five position stack here, and the layout has to be planned around the four position 200A assemblies instead.
9) Is Eaton group metering the right choice for a small apartment building, or should I use individual meter sockets?
A group metering assembly puts all the tenant meters on one common 800A horizontal aluminum bus in a single enclosure, fed by one service. That is the arrangement you want where the utility meters each tenant separately but you have one point of service, typically multi-tenant residential, office, and retail. Individual sockets on separate feeders make more sense when the metered points are physically spread out across a site. With 2 through 5 socket versions available at 125A or 200A each, the group approach covers small stacks as readily as it does larger ones.
10) What does A-B phase balance mean on an Eaton group metering stack and how do I lay out the tenant meters?
The assembly is configured for A-B phase balance, meaning the tenant socket positions alternate across the phases as you work down the stack rather than stacking consecutive units on one leg. That keeps the load spread evenly instead of loading one phase heavily. Practically, the socket positions are already arranged for it, so wire each tenant to its assigned position and do not shuffle unit assignments to suit the conduit run.
11) Why is Eaton group metering bus aluminum instead of copper, and does that affect my terminations?
The bus in these assemblies is aluminum. Aluminum bus is standard on utility metering equipment of this class and it carries the full 800A rating. Where it matters on the job is the terminations: use the connectors supplied with the assembly and the correct compound and torque for the conductor you are landing, and follow the labeling in the gear for aluminum or copper conductor acceptance.
How fast can I get the Eaton 1MM520RRLB 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 1MM520RRLB come with a warranty?
Absolutely. The Eaton 1MM520RRLB 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 1MM520RRLB?
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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