Eaton 3MM512RRL Residential Meter Stack - UL Listed
Part Number: 3MM512RRL
Quick Summary
Eaton residential meter stack delivers centralized metering for multi-unit facilities, consolidating main power into a secure, scalable distribution. Operators often struggle with cumbersome installs and wiring complexity when expanding metering in retrofit or new-build projects. Key certifications and approvals include UL Listed status and broad utility approvals from CMP, Dominion, Georgia Power, and TNMP. This combination supports faster procurement, safer installation, and long-term compliance in residential metering applications. Leverage this solution for metering products, power distribution, and scalable multi-tenant infrastructure to drive operational efficiency.
Product Information
Extended Description
3MM512RRL Eaton: Eaton residential meter stack, Group Metering Type, 125A, Aluminum Bus 800 Ampere, No bypass, Indoor/outdoor, Five-jaws, 5 Sockets, Three-phase in, single-phase out, Ringless Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM512RRL
UPC
786849052164
Product Length/Depth
60 in
Product Height
8 in
Product Width
15 in
Product Weight
64.75 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 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
5
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM512RRL
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Group Metering Type with 125A rating and 800A bus, five jaws and five sockets, three-phase in with single-phase out. Business Impact: Enables centralized, scalable metering for multi-tenant or mixed-use buildings, reducing equipment footprint and simplifying future upgrades. Application: Ideal for residential clusters and light commercial metering projects seeking efficient conductor management and streamlined breaker coordination. Feature: Aluminum bus with 800 A capacity and robust mechanical construction. Business Impact: Improves current carrying capacity while reducing weight and installation labor, lowering total installed cost. Application: Suitable for indoor/outdoor installations where long-term reliability and corrosion resistance matter. Feature: Indoor/outdoor enclosure, ringless security, and no bypass. Business Impact: Enhances safety, tamper resistance, and reliability in exposed or semi-exposed environments, supporting code-compliant installations. Application: Exterior meter enclosures and entrance stations for multi-dwelling developments. Feature: Compatibility with secondary breakers BR2_, BRH2_, BRHH2_ and a flexible main-breaker path. Business Impact: Facilitates smooth integration with Eaton or third-party breakers, enabling upgrade paths without complete panel replacement. Application: Retrofit scenarios and new-metering installations where upgrade flexibility matters. Feature: Compliance and warranty (UL Listed, broad utility approvals, and Eaton policy). Business Impact: Reduces risk with recognized safety certification and reliable post-sale support, improving procurement confidence. Application: Procurement for projects requiring formal utility acceptance and documented warranty coverage. Feature: Physical dimensions and weight (60 in length, 8 in height, 15 in width; 64.75 lb). Business Impact: Predictable space planning and logistics, aiding enclosure layout and shipping considerations. Application: Design-friendly for corridor or utility room layouts in multi-unit buildings.
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FAQs
The 3MM512RRL supports group metering with three-phase in and single-phase out, designed to integrate with standard main breakers and secondary options BR2_, BRH2_, BRHH2_. Its indoor/outdoor enclosure and five-jaw, five-socket configuration simplify layout planning and replacement in existing multi-tenant panels, reducing retrofitting time and minimizing downtime during upgrades.
Key specs include a 125A amperage rating, 800A bus rating, aluminum bus material, 60 in length, 8 in height, 15 in width, weight 64.75 lb, voltage rating 120/208V, and a three-phase in, single-phase out configuration with five jaws and five sockets. Bypass is none and the enclosure is suitable for indoor/outdoor use.
Best suited for multi-unit residential buildings, light commercial metering, and mixed-use developments requiring centralized metering and scalable distribution. It supports group metering implementations, simplifies utility-grade measurement, and provides secure, ringless metering with robust fire and shock protection for utility-grade installations.
The product is UL Listed and carries broad utility approvals cited in the specifications, including endorsements from multiple utilities. This combination supports compliance with safety and utility acceptance programs, streamlining project approvals and reducing risk during procurement and installation.
Consider the UL Listed safety certification, warranty terms (one year from installation or 18 months from shipment), and the availability of compatible secondary breakers for upgrade paths. The durable aluminum bus, ringless security, and modular metering design reduce maintenance frequency, while faster installation and utility approvals can shorten project timelines and improve ROI.