Eaton 3MM312C2AC Residential Meter Stack - UL Listed
Part Number: 3MM312C2AC
Quick Summary
The Eaton 3MM residential meter stack enables multi-metering for shared residential facilities. It simplifies field wiring and submetering upgrades by consolidating metering points in a single enclosure. UL Listed safety certification ensures compliance for indoor installations and reliable operation. Designed for multi-metering with three-phase in, single-phase out and 120/208 VAC capabilities, it enables scalable energy monitoring. For installers, the compact dimensions and robust copper bus support practical handling during relocation or upgrade projects. By centralizing metering, it reduces commissioning time and improves accuracy, delivering tangible business value for property managers and electrical contractors pursuing efficient energy management in multi-tenant environments.
Product Information
Extended Description
3MM312C2AC Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Copper, Bus:800A, No bypass, Indoor, Depends on selected MCB, Five-jaw, Socket:3, Three-phase in, single-phase out, A-C, BR2_, BRH2_, BRHH2_, BRX2, Ring, Socket:125A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM312C2AC
UPC
782114631942
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
57 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
Eaton Specification Sheet - 3MM312C2AC
Selling Policy 25-000 - Distribution and Control Products and Services
Multi-metering capability is designed for a 125A service with a copper bus rated to 800A. The result is accurate billing across meters and reduced risk of cross-connection errors, making it ideal for residential complexes and mixed-use buildings where tenants require separate energy accounting. The unit supports three-phase in, single-phase out and 120/208 VAC, enabling flexible connections across common utility configurations and improving system reliability. Installation compatibility is enhanced by a five-jaw socket and a dedicated 3‑socket arrangement, which align with standard Eaton MCB configurations, such as BR2_, BRH2_, BRHH2_, and BRX2, reducing field wiring time and contact resistance. Hard-wearing construction plus indoor-rated design translates to lower maintenance costs and longer service life in demanding environments. This meter stack integrates smoothly with existing electrical rooms, accelerating commissioning and ensuring ongoing energy visibility for demand management. In practice, engineers report improved load profiling accuracy and faster submetering deployment in new builds and retrofit projects.
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FAQs
The 3MM312C2AC uses a five-jaw socket and socket:3 arrangement that aligns with common Eaton MCBs, including BR2, BRH2, BRHH2, and BRX2 lines. It supports three-phase in, single-phase out and indoor installation, simplifying wiring among different meters. Ensure the selected MCBs match the enclosure ratings and verify mounting clearances in the electrical room to avoid thermal or wiring congestion.
The unit is designed for a 125A service with a copper bus rated to 800A. It operates at 120/208 VAC and provides three-phase in, single-phase out configurations. The enclosure is intended for indoor use, and the product weighs approximately 57 lb with dimensions around 12.26 in (length) by 41.8 in (height) by 7.01 in (width).
Yes. It is specifically intended for multi-metering in residential or mixed-use facilities, consolidating several meters in one rugged enclosure. The design supports scalable energy monitoring, enabling individual tenant billing while preserving centralized metering management, which improves accuracy, reduces wiring complexity, and speeds up submetering deployments in retrofit or new-build projects.
The product carries UL Listed certification, signaling compliance with recognized safety standards for electrical equipment. This certification supports indoor installation in residential and commercial environments, helps meet building codes, and provides assurance to electrical contractors and building owners about safety performance and reliability during normal operation.
The meter stack reduces field wiring complexity and commissioning time, translating to lower labor costs during installation. Its UL Listed safety and robust construction contribute to longer service life, reducing maintenance intervals. Over the life of the system, building operators can achieve improved energy visibility, more accurate tenant billing, and faster payback through optimized energy management.