Eaton 3MM512R Residential Meter Stack - UL Listed
Part Number: 3MM512R
Quick Summary
An Eaton residential meter stack is a three-phase in, single-phase out group metering module designed for multi-tenant buildings and light-commercial applications. It centralizes metering while saving wall space and simplifying wiring. For projects with limited space or complex tenant metering, installation and wiring errors are common pain points—this unit reduces risk with a compact footprint and clear conductor routing. Certification and compliance underpin its adoption; the product is UL Listed and backed by Eaton’s warranty and broad utility approvals. The unit works with Eaton secondary breakers BR2_, BRH2_, BRHH2_ and supports 120/208V service, delivering reliable metering with scalable capacity for growth and tenant demands.
Product Information
Extended Description
3MM512R Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 125A, Aluminum Bus 800 Ampere, No bypas,s Indoor/outdoor, Five-jaws, 5 Sockets, Three-phase in, single-phase out, Ring Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM512R
UPC
786849051990
Product Length/Depth
55.5 in
Product Height
8 in
Product Width
15 in
Product Weight
65 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
DC : Atlantic City Electric / Delmarva (Connectiv) DE : Atlantic City Electric / Delmarva (Connectiv) MD : First Energy (Potomac Edison) MD : Atlantic City Electric / Delmarva (Connectiv) NJ : Atlantic City Electric / Delmarva (Connectiv) TX : CenterPoint Energy (HL&P/Reliant) NC : Dominion VA : Dominion MI : DTE Energy (Detroit Edison) AR : Entergy LA : Entergy MS : Entergy TX : Entergy ID : Idaho Power OR : Idaho Power WA : Seattle City Light AK : Anchorage Municipal Light & Power NV : NV Energy CA : City of Los Angeles - DWP (LADWP) AZ : Southern California Edison CA : Southern California Edison CA : Pacific Gas and Electric (PG&E) CA : Sacramento Municipal Utility District (SMUD) TN : Nashville Electric Service MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy MD : Baltimore Gas and Electric DC : PEPCO MD : PEPCO IN : Indianapolis Power and Light (IP&L) WA : Puget Sound Energy WA : Tacoma Public Utilities
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
Ring
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM512R
Feature: Group Metering Type with 125A rating and 800A bus rating; Business Impact: delivers scalable service with strong fault tolerance and future expansion without replacing the enclosure; Application: ideal for multi-tenant residential buildings and light commercial campuses. Feature: Aluminum bus, five-jaw configuration and five sockets; 120/208V; three-phase in, single-phase out; Business Impact: simplifies conductor routing, reduces material costs, and supports flexible downstream metering; Application: central metering feeding multiple tenants or subpanels. Feature: Indoor/outdoor enclosure with ring security and no bypass; Business Impact: enhances reliability and metering integrity in varied environments; Application: versatile installations from interior electrical rooms to exterior wall mounts. Feature: Secondary circuit breaker compatibility BR2_, BRH2_, BRHH2_; Business Impact: enables straightforward integration with existing Eaton breaker families; Application: fast upgrades and service reliability. Feature: Broad utility approvals and UL Listed certification; Business Impact: minimizes utility rejection risk and speeds commissioning; Application: suitable for projects across multiple utility territories. Feature: Compact footprint with 55.5 in length, 15 in width, 8 in height and 65 lb weight; Business Impact: easier handling and installation in tight spaces; Application: space-constrained installations in multi-tenant or campus settings.
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FAQs
The 3MM512R supports the Eaton BR2_, BRH2_, and BRHH2_ secondary circuit breakers, enabling a straightforward upgrade path and consistent brand compatibility. This simplifies installation, reduces part variety, and ensures reliable electrical performance when integrating downstream metering with the unit’s five-jaw, five-socket configuration and 120/208V service.
Key specs include a 125A amperage rating, an 800A bus rating, aluminum bus material, 120/208V voltage rating, three-phase in with single-phase out, and a five-jaw, five-socket arrangement. This combination supports scalable, centralized metering for multi-tenant or light commercial applications while maintaining flexibility for downstream submetering.
Yes. The 3MM512R is UL Listed, confirming compliance with recognized safety standards. It is designed for indoor or outdoor use, providing a versatile enclosure suitable for various installation environments—from mechanical rooms to exterior wall mounting—while maintaining meter integrity and reliability.
The product carries Eaton’s warranty policy: one year from installation or eighteen months from shipment, whichever occurs first. Important installation considerations include ensuring compatibility with a suitable main breaker for the interrupt rating, proper indoor/outdoor enclosure placement, and using the BR2 BRH2 BRHH2 breakers for downstream metering as needed.
This meter stack is ideal for multi-tenant residential buildings, small commercial campuses, and group metering scenarios requiring centralized measurement and tenant separation. Its 125A rating, 800A bus, 120/208V service, five-jaw/socket configuration, and UL Listed status support reliable, scalable metering across multiple tenants or facilities while complying with utility requirements.