Eaton 3MM412RRL Three-Phase Meter Stack - UL Listed
Part Number: 3MM412RRL
Quick Summary
Eaton residential meter stack enables three-phase group metering for multi-tenant and commercial power systems. Engineers often face wiring complexity and space constraints that slow commissioning and raise installation costs. UL Listed certification underpins safety and performance, while the indoor/outdoor enclosure compatibility and ringless security help protect assets and simplify field deployment. This model focuses on a 125A rating with an 800A aluminum bus and five-jaw, four-socket configuration, enabling scalable metering without bypass. By aligning with standard utility practices and offering a compact, modular design, it delivers faster installs, reliable metering data, and lower lifecycle costs.
Product Information
Extended Description
3MM412RRL Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 125A, Aluminum Bus 800 Ampere, No bypass, Indoor/outdoor, Five-jaws, 4 Sockets, Three-phase in, single-phase out, Ringless Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM412RRL
UPC
786849052157
Product Length/Depth
54.5 in
Product Height
8 in
Product Width
15 in
Product Weight
61 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
Type
Group Metering
Utility approvals
ME : Central Maine Power NC : Dominion VA : Dominion ME : Emera Maine (Bangor Hydro Electric Co./ Maine Public Service Company) AR : Entergy LA : Entergy MS : Entergy TX : Entergy GA : Georgia Power KS : Kansas City Power and Light (KCPL) / Westar Energy MO : Kansas City Power and Light (KCPL) / Westar Energy TN : Middle Tennessee EMC FL : Tallahassee City Electric SC : South Carolina Electric and Gas (SCE&G) IN : Indiana Michigan Power (IMP) (AEP East) MI : Indiana Michigan Power (IMP) (AEP East) OH : AEP Ohio (AEP East) TN : Appalachian Power (AEP East) VA : Appalachian Power (AEP East) WV : Appalachian Power (AEP East) TX : Texas-New Mexico Power (TNMP) NM : Texas-New Mexico Power (TNMP)
Interrupt rating
Depends on selected main circuit breaker
Enclosure
Indoor/outdoor
Secondary circuit breaker
BR2_, BRH2_, BRHH2_
Bus Rating
800 A
Phase
Three-phase in, single-phase out
Voltage rating
120/208V
Amperage Rating
125A
Bus material
Aluminum
Bypass
None
Number of jaws
Five-jaw
Number of sockets
4
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM412RRL
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Group Metering Type for three-phase in, single-phase out. Business Impact: enables centralized monitoring across multiple service drops, reducing wiring complexity and streamlining energy accounting. Application: ideal for multi-tenant buildings and commercial facilities needing accurate, verifiable kWh data. Feature: 125A Amperage Rating with 800A Aluminum Bus. Business Impact: supports robust service capability with lighter weight aluminum design, improving installation efficiency and durability. Application: suitable for service feeders at 125A with high bus capacity for future expansion. Feature: Five-jaw, four-socket configuration. Business Impact: flexible phasing and connection options, simplifying field wiring and maintenance. Application: accommodates three-phase in and single-phase out setups while preserving fault isolation. Feature: Indoor/Outdoor enclosure with Ringless Security and No Bypass. Business Impact: enhances safety, tamper resistance, and environmental versatility, enabling easier outdoor mounting and safer indoor installations. Application: appropriate for varied environments including outdoor walls and mechanical rooms. Feature: UL Listed and Utility-Approved design. Business Impact: delivers proven compliance and compatibility with utility programs, reducing qualification time and risk. Application: aligns with standard utility practices for residential and light commercial group metering.
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FAQs
The Eaton 3MM412RRL is a three-phase residential meter stack designed for group metering in multi-tenant and commercial facilities. It features a 125A rating, 800A aluminum bus, five-jaw input, four sockets, 120/208V operation, indoor/outdoor enclosure, and ringless security with no bypass. It is UL Listed and supports centralized energy measurement with scalable capacity.
The 3MM412RRL specifies that interrupt rating depends on the selected main circuit breaker. This means the device does not have a fixed interrupt rating; the overall system protection is determined by the main breaker installed upstream. Verify the main breaker rating to ensure compatibility and safe operation within the 125A service and 800A bus framework.
Yes, the 3MM412RRL is rated for indoor/outdoor use, providing flexibility for wall-mount or service entrance installations. It carries UL Listed certification and aligns with a broad list of utility approvals across multiple jurisdictions, supporting group metering for residential and light commercial applications. Check local utility requirements to confirm acceptance in your project area.
The aluminum bus reduces weight and corrosion potential while delivering solid conductivity, easing handling and installation. Ringless security minimizes open-access tamper points, enhancing safety and compliance. Together, these features simplify site work, improve reliability, and help meet security and code requirements in modern metering installations.
Eaton provides a warranty policy covering one year from installation or eighteen months from shipment, whichever occurs first, as part of its standard terms. Technical support and service resources are available through Eaton channels, providing guidance on installation, maintenance, and compatibility with compatible main breakers and utility programs.