Eaton 1MM312R Residential Meter Stack - UL Listed
Part Number: 1MM312R
Quick Summary
The Eaton 1MM312R residential meter stack delivers compact, reliable metering for single‑phase service entrances. Installing meter stacks can be labor‑intensive and error‑prone without a robust enclosure and clearly defined specifications. This model is UL Listed and supported by extensive utility approvals, plus NEC guidance, helping ensure safe, compliant installations. The unit supports indoor/outdoor mounting, 120/240 V operation, and a 125 A amperage rating with an 800 A bus rating, offering flexible service entry for residences and light commercial sites. Its aluminum enclosure and modular design reduce field labor, streamline maintenance, and improve reliability for property managers and electrical contractors alike, while aligning with project timelines and budget goals through straightforward integration with standard main breakers.
Product Information
Extended Description
1MM312R Eaton: Eaton residential meter stack, Amperage rating: 125A, Bus rating: 800A, Indoor/Outdoor, Interrupt rating depends on selected main circuit breaker, Single-phase in/single-phase out, 3 Sockets, Aluminum, Ring, 120/240 Vac
Product Name
Eaton residential meter stack
Catalog Number
1MM312R
UPC
786849051891
Product Length/Depth
7.01 in
Product Height
41.8 in
Product Width
12.26 in
Product Weight
50 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
Multiple 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) NM : El Paso Electric TX : El Paso Electric 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
Bus Rating
800 A
Phase
Single-phase in, single-phase out
Voltage rating
120/240 V
Amperage Rating
125A
Guidance to comply with NEC 230.71 for service entrance equipment installation in garden-style apartments
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 1MM312R
Feature is a compact, multi‑meter capable enclosure that consolidates metering for single‑phase service. Business impact is reduced space requirements, faster installation, and fewer field connections, which translates to lower labor costs and fewer commissioning issues on-site. Application is ideal for garden‑style apartments and light commercial entries where space is at a premium and reliable metering is required. Feature the indoor/outdoor aluminum enclosure for durability in varying environments, delivering improved corrosion resistance and long-term performance while enabling a single solution across multiple installation locations. Business impact includes lower maintenance cycles and better asset uptime, supporting ongoing property management and contractor efficiency in complex residential portfolios. Application spans utilities with broad state approvals, allowing rapid interconnection and simplified procurement for engineers. Feature compatibility with 125 A service and 800 A bus rating ensures flexibility when selecting a main breaker, reducing design constraints and speeding up project timelines; this is particularly valuable in retrofit scenarios where existing infrastructure must be integrated quickly and safely.
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FAQs
Installation is suited for single‑phase in/out, 120/240 V service with an indoor/outdoor enclosure. The 125 A rating and 800 A bus rating accommodate typical residential loads. Ensure the interrupt rating aligns with the selected main circuit breaker and follow NEC guidance, including NEC 230.71. The unit's 7.01 in depth, 41.8 in height, and 12.26 in width should be accounted for in enclosure clearances and labeling.
Key specs are 125 A amperage rating, 800 A bus rating, 120/240 V, single‑phase in/out, indoor/outdoor enclosure, 3 sockets, aluminum construction, and UL Listed certification. Catalog Number is 1MM312R with UPC 786849051891. Dimensions are 7.01 in depth, 41.8 in height, and 12.26 in width, with an approximate 50 lb weight, designed for reliable field performance.
Yes. The 1MM312R is a residential meter stack designed for single‑phase service entrances, with broad utility approvals supporting interconnection in diverse districts. Its compact footprint, 125 A service, and 800 A bus rating make it suitable for garden‑style apartments and light commercial sites that require certified, space‑efficient metering solutions with NEC compliance guidance.
The 1MM312R is UL Listed, indicating adherence to recognized safety standards for electrical enclosures and meter equipment. This certification, combined with NEC guidance documents such as NEC 230.71 and Eaton’s application notes, helps ensure compliant installation, safer operation, and easier inspection processes for residential and light commercial metering projects.
The product comes with Eaton’s warranty policy: one year from the installation date or eighteen months from shipment, whichever occurs first. Support is available through Eaton’s technical resources and authorized distributors. The robust warranty, coupled with durable aluminum construction and a widely approved metering stack, supports predictable maintenance planning and lifecycle ROI for property managers.