Eaton 3MM612R12 Residential Meter Stack - UL Listed
Part Number: 3MM612R12
Quick Summary
Eaton residential meter stack provides centralized metering for three-phase to single-phase applications in commercial and light industrial facilities. This modular group metering solution helps simplify wiring, reduce installation errors, and streamline service connections in complex power setups. UL Listed certification ensures electrical safety and reliable performance in indoor and outdoor environments, while the rugged aluminum bus and 1200 A bus rating support demanding service feeders. By consolidating metering at a single point, you can accelerate commissioning, improve load visibility, and lower ongoing maintenance costs. For installers and procurement teams, compatibility with standard circuit breakers and utility approvals helps ensure a smooth, code-compliant deployment across multiple sites.
Product Information
Extended Description
3MM612R12 Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 125A, Aluminum Bus 1200 Ampere, No bypass, Indoor/outdoor, Five-jaws, 6 Sockets, Three-phase in, single-phase out, Ring Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM612R12
UPC
782114733752
Product Length/Depth
64.5 in
Product Height
8.5 in
Product Width
15.5 in
Product Weight
81 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
Group Metering
Utility approvals
ID : Idaho Power OR : Idaho Power WA : Seattle City Light AK : Anchorage Municipal Light & Power NV : NV Energy WA : Puget Sound Energy WA : Tacoma Public Utilities
Interrupt rating
Depends on selected main circuit breaker
Enclosure
Indoor/outdoor
Secondary circuit breaker
BR2_, BRH2_, BRHH2_
Bus Rating
1200 A
Phase
Three-phase in, single-phase out
Voltage rating
120/208V
Amperage Rating
125A
Bus material
Aluminum
Bypass
None
Number of jaws
Five-jaw
Number of sockets
6
Phase balance
A-B
Security
Ring
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM612R12
Feature three-phase in, single-phase out design → Business Impact simplifies metering architecture and reduces cross-wiring, speeding up project timelines in multi-tenant and commercial buildings. Application well-suited for group metering modules with long-term reliability. Feature 125 A rating, 1200 A bus rating, aluminum bus → Business Impact supports high current feeders with lighter weight and corrosion resistance, lowering installation effort and ongoing maintenance. Application ideal for large service entrances and scalable metering. Feature indoor/outdoor enclosure, no bypass → Business Impact enhances durability and security in varying environments, reducing downtime and service calls. Application robust for both exterior installations and protected interiors. Feature five-jaw connections, six sockets, and three-phase in, single-phase out → Business Impact offers flexible, scalable connections that simplify wiring layouts and improve load balancing. Application perfect for multi-meter configurations in apartments, data centers, and commercial facilities. Feature Ring Security and UL Listed certification → Business Impact improves tamper resistance and regulatory compliance, easing inspections and acceptance testing. Application valuable for property managers and electrical contractors. Utility approvals including Idaho Power, Puget Sound Energy, Seattle City Light → Business Impact removes site-specific approval roadblocks, accelerating permit approvals and installation readiness. Application across diverse utility programs and service territories. Warranty and compatibility notes: interrupt rating depends on the main circuit breaker used, ensuring you select hardware to meet site requirements. Application seamless with Eaton and third-party breakers for configurable protection.
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FAQs
Begin by mounting the unit in its indoor/outdoor enclosure, connect the five jaws for the incoming three-phase supply, and terminate the six sockets for outgoing single-phase circuits. Ensure the main circuit breaker selected provides the desired interrupt rating and verify utility approvals for the site. Follow Eaton installation guidelines and local code requirements to complete a code-compliant group metering stack.
The 3MM612R12 supports 125 A nominal amperage, 120/208 V system voltage, and a 1200 A bus rating with aluminum bus material. It is a three-phase in, single-phase out module with five-jaw connections and six sockets, no bypass, and Ring Security. Interrupt rating depends on the main breaker installed, so select a compatible main breaker to meet system protection needs.
Yes. The product lists utility approvals including Idaho Power, WA Puget Sound Energy, Seattle City Light, Alaska Anchorage Municipal Light & Power, NV Energy, and Tacoma Public Utilities. These approvals facilitate permit readiness and utility coordination, reducing project timelines when deploying group metering across multiple sites.
Eaton provides a warranty per policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. The unit is UL Listed and designed for durable indoor/outdoor use with no bypass, which minimizes maintenance events. Regular inspection of connections and breakers per site standards helps sustain reliability.
Group metering consolidates meters into a single module, reducing field labor for installation, testing, and commissioning. It improves load visibility for demand management, supports faster fault isolation, and lowers ongoing maintenance costs by centralizing monitoring and wiring. The design also streamlines utility coordination through standard components and approvals.