Eaton Three-Phase Meter Stack ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,779.41
Eaton Meter Stack Module Three-Phase In Single-Phase Residential 800A 3-Socket Group Metering 120/208V Indoor/Outdoor - Ringless Style Covers with Lever Bypass

Eaton Three-Phase Meter Stack Module 800A Group Metering System with Lever Bypass 120/208V

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Model: 3MM412RRLV

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

$2,779.41
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Eaton Three-Phase Meter Stack Module 800A Group Metering System with Lever Bypass 120/208V

Professional Multi-Unit Electrical Distribution & Metering Solution

The Eaton Three-Phase Meter Stack Module delivers reliable electrical distribution and group metering for multi-unit residential applications. This professional-grade system features 800A bus rating with three-phase input and single-phase output configuration, aluminum bus construction, and outdoor-rated enclosure with ringless style covers and lever bypass functionality for versatile installation requirements.

Professional Features & Benefits

  • 800A Bus Rating: High-capacity electrical distribution supports multiple residential units with reliable power delivery and load management capabilities.
  • Three-Phase Input, Single-Phase Output: Efficient power conversion from three-phase utility service to single-phase residential distribution with A-B phase balance configuration.
  • Aluminum Bus Construction: Durable bus material provides excellent conductivity and corrosion resistance for long-term reliable operation in outdoor environments.
  • Five-Jaw Configuration: Multiple connection points accommodate various metering and distribution requirements for flexible system design and installation.
  • Outdoor Enclosure Rating: Weather-resistant construction enables installation in exterior locations while maintaining protection and accessibility for service.
  • UL Listed Certification: Meets rigorous safety and performance standards ensuring code compliance and professional installation confidence.
  • Lever Bypass Design: Convenient maintenance and service access with ringless style covers for efficient operation and reduced downtime.

Technical Specifications

  • Amperage Rating: 125A
  • Bus Material: Aluminum
  • Bus Rating: 800 A
  • Certifications: UL Listed
  • Enclosure: Outdoor
  • Interrupt Rating: Depends on selected main circuit breaker
  • Number Of Jaws: Five-jaw
  • Phase: Three-phase in, single-phase out
  • Phase Balance: A-B
  • Product Details: Group Metering
  • Product Height: 9 in
  • Product Width: 15 in
  • Secondary Circuit Breaker: BR2_, BRH2_, BRHH2_BRHX2_, BRX2_
  • Voltage Rating: 120/208V

Professional Applications

  • Multi-Unit Residential Properties
  • Apartment Complex Electrical Distribution
  • Condominium Power Management
  • Townhouse Electrical Systems
  • Mixed-Use Development Projects
  • Property Management Facilities
  • Residential Group Metering Applications

Why Choose Eaton Quality?

Eaton delivers proven reliability in electrical distribution with UL Listed certification ensuring code compliance and professional performance. The outdoor-rated aluminum bus construction and five-jaw configuration provide durable operation and flexible installation options for demanding multi-unit residential applications.

Manufacturer Resources

Product Specs

Amperage Rating:
125A
Bus Material:
Aluminum
Bus Rating:
800 A
Certifications:
UL Listed
Configuration:
Outdoor
Interrupt Rating:
Depends on selected main circuit breaker
Number Of Jaws:
Five-jaw
Phase:
Three-phase in, single-phase out
Phase Balance:
A-B
Product Details:
Group Metering
Product Height:
9 in
Product Width:
15 in
Secondary Circuit Breaker:
BR2_, BRH2_, BRHH2_BRHX2_, BRX2_
Voltage Rating:
120/208V
Department:
Electrical
Product Group:
Meters and Sockets
Product Type:
Meter

Eaton 3MM412RRLV – Frequently Asked Questions

1) Will an Eaton 3MM meter stack module work on a 120/208V three-phase service feeding single-phase apartment meters?
That is exactly the configuration the Eaton three-phase meter stack module is built for: three-phase in, single-phase out, rated 120/208V. The utility service lands three-phase on the 800A aluminum bus, and each tenant socket is fed single-phase off an A-B phase balance arrangement, so the load spreads across the phases as you fill the stack. If your service is 120/240V single-phase, this is the wrong module.
2) How many tenant meter sockets can I get in an Eaton 3MM RRLV meter stack module?
The 3MM lever bypass modules come in 2, 3, 4, 5, and 6 socket versions: 3MM212RRLV, 3MM312RRLV, 3MM412RRLV, 3MM512RRLV and 3MM612RRLV. Every one of them is a 125A socket module on the 800A bus, so you size the stack by picking the module count that matches your unit count and stack them to reach the total. A 12 unit building is typically two 6 socket modules.
3) Is a five-jaw meter socket the right one for my utility, or do I need four-jaw?
The 3MM module is a five-jaw socket. On a 120/208V network feed, the fifth jaw carries the neutral, which is what most utilities require when a single-phase tenant meter is fed from a three-phase wye service. If your utility's meter spec calls for a four-jaw socket, this module will not meet it. Check the utility's approved meter socket list before you order, because the jaw count is not field-changeable.
4) Can I pull a tenant meter for service without dropping power to the unit on the Eaton 3MM stack?
Lever bypass is the reason to pick the RRLV modules. Throwing the lever shunts around the meter so the tenant circuit stays energized while the meter is removed or exchanged, which is what utilities and property maintenance crews want on an occupied building. The covers are ringless style, so the meter is retained by the cover rather than a sealing ring.
5) What size breaker can I put behind each tenant meter in an Eaton 3MM meter stack?
Each socket position is rated 125A, and the tenant branch device is a BR frame breaker: BR2, BRH2, BRHH2, BRHX2 or BRX2 two-pole types. Which one you use is set by the interrupting rating your fault study requires, not by the socket, so a 10kAIC BR2 and a higher-rated BRH2 both land in the same position. Order the breakers separately, they are not part of the module.
6) What is the short circuit current rating of the Eaton 3MM group metering stack?
The interrupting rating of the 3MM stack follows whatever main circuit breaker you select ahead of it, so there is no single fixed number for the module itself. That matters on a plan review: the engineer specifies the main device to meet the available fault current at the service, and the stack assembly is rated accordingly. Choose the main first, then confirm the branch BR-family breakers you install carry an interrupting rating at least as high.
7) Can the Eaton 3MM meter stack be mounted outdoors on an exterior wall?
Yes, the enclosure is outdoor rated, which is the normal mounting for a multifamily group metering stack on an exterior wall or in an open meter room. It is UL Listed. Keep the standard utility working clearance and meter height requirements in mind, since those are set by the serving utility rather than by the equipment.
8) How much wall space does each Eaton 3MM meter stack module take up?
Each 3MM module measures 9 in by 15 in, and a stack is built by adding modules vertically until you have a socket for every unit. Multiply the 9 in dimension by your module count, then add the main device and any pull section, to see whether the run fits the wall or the meter room bay you have.
9) Can I add more meter sockets later to an existing Eaton 3MM group metering stack?
The 3MM line is modular by socket count, 2 through 6 per module, so an expansion means adding another module onto the same 800A bus rather than replacing the assembly. The limit is the bus: total connected load across all stacked modules has to stay within the 800A rating, and each tenant position is 125A. Plan the phase distribution too, since the sockets alternate on an A-B balance.
10) Is aluminum bus a problem for a long-term apartment meter installation?
The 3MM stack uses an aluminum bus, which is standard for group metering gear at this 800A capacity. The practical requirement is at the terminations: use listed connectors for the conductor material you are landing, apply the manufacturer's torque values, and re-torque at commissioning. That is where aluminum installations fail, not in the bus itself.
11) Do I still need a house panel if I install an Eaton 3MM group metering stack?
The 3MM stack meters and feeds the individual tenant units. Common area loads, corridor lighting, elevators, and site lighting are not tenant loads and need their own metered position or a separate house panel fed from the service. Budget bus capacity for that too, since everything shares the same 800A bus.
How fast can I get the Eaton 3MM412RRLV 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 3MM412RRLV come with a warranty?
Absolutely. The Eaton 3MM412RRLV 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 3MM412RRLV?
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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