Eaton 3MM512R12RLB Residential Meter Stack - UL Listed
Part Number: 3MM512R12RLB
Quick Summary
The Eaton 3MM residential meter stack is a multi-meter solution for outdoor, multi-tenant electrical distributions. It reduces field labor and enclosure clutter by consolidating meters in a single rugged enclosure, speeding commissioning and simplifying maintenance. UL Listed safety certification supports code compliance in harsh outdoor environments. Designed for efficiency, it helps electricians and procurement teams standardize metering, minimize parts variety, and streamline service upgrades, while accommodating 125A service, 120/208 Vac operation, and multiple metering configurations. For project teams, the unit’s robust construction and Eaton compatibility reduce warranty exposure and spare-part inventories, enabling faster turnover between installations and fewer on-site mismatches. In short, it aligns with power management and distribution strategies that prioritize reliability, safety, and total cost of ownership.
Product Information
Extended Description
3MM512R12RLB Eaton: Eaton 3MM residential meter stack, Multiple meter, Outdoor, 125A, Al, Bus:1200A, Horn bypass, Depends on selected MCB, Five-jaw, Sockets:5, Three-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ringless, Socket:125A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM512R12RLB
UPC
782114786321
Product Length/Depth
12.26 in
Product Height
8 in
Product Width
7.01 in
Product Weight
68.1 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 - 3MM512R12RLB
Feature: Outdoor multi-meter capability with five-jaw sockets and multiple meter connections. Business Impact: Enables efficient multi-tenant metering, reduces enclosure footprint, and speeds commissioning. Application: Outdoor residential and light commercial buildings where centralized meter banks are required. Feature: 125A main with a 1200A bus. Business Impact: Supports high-service loads and future expansion without swapping enclosures. Application: Buildings and complexes with sizable electrical demand that may scale over time. Feature: Ringless, five-jaw sockets and configurable metering options. Business Impact: Improves wiring reliability and reduces installation errors, cutting onsite troubleshooting time. Application: Busy job sites and retrofit projects needing clean, dependable connections. Feature: Three-phase in, single-phase out capability. Business Impact: Supports mixed-phase feeds in single enclosure, reducing hardware diversity and inventory. Application: Mixed-use properties with both three-phase and single-phase circuits. Feature: Compact dimensions and weight (12.26 in L, 8 in H, 7.01 in W; 68.1 lb). Business Impact: Easier transport, site fit, and installation planning for outdoor enclosures. Application: Deployment on constrained outdoor walls or in limited-space electrical rooms. Feature: UL Listed safety certification and outdoor-rated design. Business Impact: Ensures compliance with safety standards, lowering risk for installers and owners. Application: Outdoor residential metering installations requiring certified equipment and robust hardware compatibility with Eaton MCB options.
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FAQs
The 3MM512R12RLB is an outdoor multi-meter stack designed for residential and light commercial buildings. It consolidates meters in one enclosure, supports a 125A main and 120/208 Vac operation, and uses five-jaw sockets to manage multiple meters efficiently, making it ideal for multi-tenant properties.
Yes. The meter stack carries UL Listed safety certification and is designed for outdoor use, providing reliable metering in exposed environments and helping meet safety and code requirements for outdoor installations.
The unit measures 12.26 inches in length, 8 inches in height, and 7.01 inches in width, and weighs 68.1 pounds, making it a compact yet robust outdoor metering solution.
Yes. The 3MM512R12RLB supports three-phase in and single-phase out, enabling mixed-phase feeders within a single enclosure and simplifying installation for properties with diverse load profiles.
Warranty follows Eaton policy 25-000: one year from installation or 18 months from shipment, whichever occurs first. Technical support is available through Eaton’s distribution and service network to assist with installation and commissioning.