Eaton 3MM412R Meter Stack - UL Listed, 5-Jaw, 125A
Part Number: 3MM412R
Quick Summary
The Eaton 3MM412R residential meter stack is a modular metering solution for group metering in multi-tenant installations. Many operators struggle with space, wiring complexity, and accurate billings; this unit consolidates meters while preserving access. UL Listed safety certification underpins reliable indoor/outdoor operation, while its 120/208V, 125A rating supports standard campus and utility needs. For business value, this residential meter stack reduces space, accelerates deployment, and improves billing visibility with robust compatibility and build quality. Secondary keywords like group metering, residential metering, and three-phase metering emphasize practical deployment in data centers, campuses, and multi-residence complexes. By combining high-density bus ratings with safe enclosure options, it aligns with Eaton's warranty terms and broad utility approvals for streamlined procurement.
Product Information
Extended Description
3MM412R 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, Ring Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM412R
UPC
786849051983
Product Length/Depth
47 in
Product Height
8.5 in
Product Width
15.5 in
Product Weight
59 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
AL : Alabama Power DC : Atlantic City Electric / Delmarva (Connectiv) DE : Atlantic City Electric / Delmarva (Connectiv) 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) MO : Empire District Electric OK : Empire District Electric AR : Entergy LA : Entergy MS : Entergy TX : Entergy 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 CA : PacifiCorp/Pacific Power/Rocky Mountain Power ID : PacifiCorp/Pacific Power/Rocky Mountain Power OR : PacifiCorp/Pacific Power/Rocky Mountain Power UT : PacifiCorp/Pacific Power/Rocky Mountain Power WA : PacifiCorp/Pacific Power/Rocky Mountain Power WY : PacifiCorp/Pacific Power/Rocky Mountain Power HI : Hawaiian Electric MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy MD : Baltimore Gas and Electric DC : PEPCO MD : PEPCO AZ : Tucson Electric Power/ UniSource AZ : Sulphur Springs Valley Electric Coop IN : Indianapolis Power and Light (IP&L)
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
Ring
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM412R
Feature: Group Metering Type with 125A rating and 800A bus, three-phase in, single-phase out. Business Impact: Enables efficient energy management for multi-tenant or light commercial projects, reducing wiring complexity and space requirements. Application: Ideal for residential complexes and mixed-use developments where clear load separation and scalable metering are essential. Feature: Five-jaw, four sockets design in a durable aluminum bus system. Business Impact: Improves connection reliability while supporting robust fault tolerance and ease of maintenance. Application: Suitable for high-density installations with frequent access needs and serviceability constraints. Feature: Indoor/outdoor enclosure and ring security with no bypass. Business Impact: Enhances operator safety, reduces tampering risk, and ensures dependable operation across changing environmental conditions. Application: Outdoor installations or in semi-protected spaces with stringent security requirements. Feature: 120/208V and UL Listed certification. Business Impact: Meets standard utility voltages and safety compliance, accelerating procurement and regulatory approvals. Application: Group metering for residential and light commercial campuses that require certified equipment. Feature: Compatibility with secondary breakers BR2_, BRH2_, BRHH2_ and broad utility approvals. Business Impact: Simplifies integration with Eaton protection schemes and utility-backed acceptance, reducing engineering time. Application: Retrofit projects and new builds that rely on Eaton’s accessory ecosystem. Feature: Warranty aligned with Eaton policies and comprehensive utility approvals. Business Impact: Improves total cost of ownership through predictable service and reduced risk of non-compliance. Application: Procurement and long-term maintenance planning for property managers and electrical contractors.
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FAQs
The 3MM412R is designed for indoor or outdoor use with a five-jaw, four-socket configuration and an aluminum bus rated at 800 A. It accepts three-phase in and single-phase out, with voltage support of 120/208V. Installations should ensure proper enclosure, clear access to all sockets, and compatibility with BR2_, BRH2_, BRHH2_ secondary breakers. The unit does not include a bypass, so plan for a main breaker that defines the interrupt rating.
Three-phase in, single-phase out allows multi-tenant or grouped metering where each service is individually fed from a common bus. This simplifies billing and reduces wiring clutter while maintaining a compact footprint. Ensure your main circuit breaker’s interrupt rating aligns with the system’s protection strategy, and pair with compatible protective devices (BR2_/BRH2_/BRHH2_ series) for reliable operation.
Yes. The unit is designed for residential meter stacks with group metering capability, supporting 120/208V systems and a 125A nominal rating on an 800A aluminum bus. Its indoor/outdoor enclosure, five-jaw configuration, and UL Listed certification make it appropriate for multi-tenant housing, small commercial buildings, and campus-style metering applications, provided utility approvals are satisfied.
The primary certification is UL Listed, indicating safety compliance for electrical assemblies. Utility approvals cited in the product data reflect broad acceptance across many states and utilities, which can simplify procurement. Always verify local codes, electrical standards, and your utility’s metering requirements to ensure full compliance before installation.
The meter stack’s modular design and compatibility with Eaton’s BR2/BRH2/BRHH2 series simplify serviceability and future upgrades. Benefits include reduced maintenance overhead due to a compact footprint, improved billing accuracy from consolidated group metering, and faster deployment in new builds or retrofit projects, delivering a favorable total cost of ownership over time.