Eaton 3MM312R12C Residential Meter Stack - UL Listed
Part Number: 3MM312R12C
Quick Summary
The Eaton 3MM312R12C residential meter stack provides multi-metering for outdoor service panels. Engineers often grapple with space limitations, wiring complexity, and metering compliance during installations. UL Listed for safety, this unit is designed for outdoor use and aligns with Eaton’s reliability standards. The solution reduces cabinet footprint while supporting scalable metering, and it integrates with Eaton metering products to simplify procurement and support. This combination delivers faster deployment, lower total installed cost, and clearer energy visibility for facility managers.
Product Information
Extended Description
3MM312R12C Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Copper, Bus:1200A, No bypass, Outdoor, Depends on selected MCB, Five-jaw, Sockets:3, 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
3MM312R12C
UPC
786685512822
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
56 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 - 3MM312R12C
Feature: Multiple metering; Business Impact: Enables simultaneous measurement for multi-tenant or mixed-use facilities, reducing the need for separate enclosures and wiring; Application: Outdoor residential applications and light commercial service entrances, with long-tail keywords such as outdoor metering stack and residential metering products. Feature: 125A sockets with a 1200A bus; Business Impact: Supports typical residential and small commercial loads with room to expand capacity, improving future-proofing and reducing mid-project redesigns; Application: Service entrances requiring robust yet scalable metering infrastructure. Feature: Five-jaw sockets and three-phase in, single-phase out; Business Impact: Streamlines connect-and-measure workflows, minimizes field wiring errors, and enhances safety during installation; Application: Multi-tenant buildings and mixed-use facilities needing precise phase configuration. Feature: Outdoor-rated design and 120/208Vac operation; Business Impact: Enables durable outdoor installations with compatible voltage standards, reducing enclosure needs and protection costs; Application: Exterior meter rooms and outdoor service panels. Feature: UL Listed certification and Eaton warranty; Business Impact: Ensures safety compliance and post-sale support, lowering risk and maintenance costs; Application: Compliance-driven projects in regulated markets and long-term asset management.
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FAQs
The 3MM312R12C is a multiple metering stack designed for outdoor service entrances and supports three-phase in with single-phase out configurations. It uses 125A sockets and a 1200A bus, and its operation with 120/208Vac makes it compatible with common Eaton MCBs used in residential and light commercial installations, simplifying procurement and reducing electrical wiring complexity.
Plan for outdoor-rated mounting with secure enclosure access. The unit features five-jaw sockets and a 1200A bus rated system, allowing straightforward wiring to 125A sockets. Ensure proper weatherproof connections, follow the UL Listed installation guidance, and coordinate with the selected MCBs to match the 120/208Vac supply. This minimizes field modifications and speeds deployment.
Yes. The model is designed for three-phase in and single-phase out configurations, enabling efficient metering for multi-tenant facilities. Its 125A sockets and 120/208Vac operation support common utility service arrangements, while the multi-metering capability provides accurate energy tracking for individual tenants without extra enclosures.
The 3MM312R12C carries UL Listed certification, signaling adherence to recognized safety standards for electrical equipment. This certification is essential for utility, municipal, and facility projects that require proven safety and reliability. Always verify regional compliance requirements, but UL Listed status is a strong foundation for safe outdoor metering installations.
The product is backed by Eaton’s warranty policy (25-000), offering one year from installation or eighteen months from shipment, whichever occurs first. To maximize ROI, schedule periodic inspections of outdoor connections, monitor for signs of corrosion or moisture ingress, and maintain documentation for energy management reporting and future upgrades.