Eaton 3MM212R12 Residential Meter Stack - UL Listed
Part Number: 3MM212R12
Quick Summary
The Eaton 3MM212R12 residential meter stack provides multi-metering for residential and small commercial electrical systems. Engineers and installers often struggle with bulky enclosures, wiring complexity, and inconsistent load monitoring in shared spaces. UL Listed safety certification ensures code compliance, and its indoor/outdoor versatility supports flexible installation across varied sites. This solution pairs with common MCBs for tailored protection, while Eaton’s 25-000 warranty backs performance over time. By consolidating metering into a compact, 125A-rated stack, you gain traceable energy data and faster fault diagnosis, reducing operational costs.
Product Information
Extended Description
3MM212R12 Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Al, Bus:1200A, No bypass, Indoor/Outdoor, Depends on selected MCB, 3-jaw, Sockets:2, Three-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ring, Socket:125A, 120/208Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM212R12
UPC
782114733714
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
55 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
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM212R12
Feature → Business Impact → Application: Multi-metering capability enables consolidated energy data collection, improving visibility, accuracy, and reducing overall metering footprint. This supports streamlined billing, easier tariff analysis, and faster fault isolation. Application: Ideal for multi-tenant residential and light commercial projects needing centralized metering. Feature → Business Impact → Application: 125A service and 120/208Vac operation ensures compatibility with standard building distributions, eliminating the need for expensive service upgrades. Application: New builds and retrofit projects desiring quick deployment. Feature → Business Impact → Application: Indoor/Outdoor versatility provides installation flexibility, reducing site constraints and accelerating project timelines. Application: Utility rooms, exterior walls, and protected outdoor locations. Feature → Business Impact → Application: 3-jaw connections and two 125A sockets deliver robust, secure terminations, lowering maintenance needs and contact resistance. Application: Dynamic loads across phases in mixed-use facilities. Feature → Business Impact → Application: No bypass configuration with protection coordinated through-select MCBs improves safety and reliability. Application: Standard metering stacks for residential and small commercial deployments. Feature → Business Impact → Application: UL Listed certification and Eaton warranty offer risk mitigation and predictable long-term performance. Application: Asset-intensive installations across housing and small business settings.
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FAQs
Installers should plan for 125A service with a 120/208Vac supply and confirm compatibility with your chosen molded case circuit breakers (MCBs). The unit uses a 3-jaw connection and provides two sockets at 125A capacity, suitable for both indoor and outdoor installations. Consider enclosure space, wiring routing, and local code requirements; Eaton's data sheet provides mounting clearances and field wiring guidance.
Yes. The 3MM212R12 supports three-phase input with single-phase output, delivering multi-metering for buildings with split-phase or single-phase downstream circuits. This arrangement simplifies energy distribution monitoring and fault isolation, particularly in mixed-load environments common in multi-tenant homes or light commercial facilities.
With multiple meters consolidated in one stack, the system provides aligned load data, improving accuracy of consumption tracking, peak demand analysis, and bill-back capabilities. The result is faster anomaly detection, optimized tariff billing, and a measurable reduction in energy waste across the facility.
UL Listed safety certification confirms compliance with electrical codes and safety standards. Eaton backs the product with policy 25-000, offering a one-year warranty from installation or eighteen months from shipment, whichever occurs first. This warranty supports asset longevity and provides a clear maintenance baseline.
Dimensions are 12.26 inches deep, 41.8 inches high, and 7.01 inches wide, with a 55-pound weight. Plan for adequate mounting clearance, door/outlet access, and routing space for field wiring. Consider future service access and local requirement clearances to ensure safe, compliant installation.