Eaton 3MM212R12RL Meter Stack - UL Listed Metering
Part Number: 3MM212R12RL
Quick Summary
The Eaton 3MM212R12RL Meter Stack provides compact three-phase service aggregation for residential and light commercial applications, enabling efficient group metering in tight spaces across modern installations. For engineers and procurement teams, the challenge is meeting space constraints, ensuring safety, and aligning with evolving utility requirements without sacrificing reliability or uptime across portfolios. This unit carries UL Listed certification and is validated for Georgia Power and Texas-New Mexico Power approvals, providing confidence in code compliance and field acceptance across markets. Its indoor/outdoor enclosure, 125A amperage rating, and 120/208V system profile support scalable metering strategies, reducing installation time and maintenance risk while delivering measurable business value for owners and integrators.
Product Information
Extended Description
3MM212R12RL Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 125A, Aluminum Bus 1200 Ampere, No bypass, Indoor/outdoor, Five-jaws, 2 Sockets, Three-phase in, single-phase out, Ringless Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM212R12RL
UPC
782114786215
Product Length/Depth
40 in
Product Height
8.5 in
Product Width
15.5 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
Group Metering
Utility approvals
GA : Georgia Power TX : Texas-New Mexico Power (TNMP) NM : Texas-New Mexico Power (TNMP)
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
2
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM212R12RL
125A amperage rating, 120/208V operation, and a 1200A bus rating provide headroom for future main breakers and phased load growth, translating into fewer service interruptions and easier capacity planning in multi-unit projects. The aluminum bus construction reduces weight without compromising current-carrying capability, improving transport, handling, and installation speed on-site while supporting durable long-term performance in variable environments. Three-phase in, single-phase out design streamlines wiring arrangements for group metering, lowers labor costs, and enhances system coordination with minimal cabinet footprint. The five-jaw, two-socket configuration enables straightforward meter connections, while the indoor/outdoor enclosure and ringless security offer flexible placement and tamper-resistance in shared facilities. Compatibility with BR2, BRH2, and BRHH2 secondary breakers gives integrators versatile protection options, reducing engineering time and enabling rapid retrofits. Utility approvals (GA, NM) aid permitting and field acceptance, while UL Listed certification underpins safety, reliability, and compliance with industry standards. The no-bypass design prioritizes safety and tamper-resistance, supporting code-compliant metering stacks in dense buildings and mission-critical deployments. With space efficiency, modularity, and robust protection features, operators realize faster installs, predictable maintenance cycles, and a stronger ROI over the life of the asset.
Get a Quick Quote for a Eaton 3MM212R12RL
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton 3MM212R12RL?
Enquire Now
FAQs
This meter stack is designed to work with compatible secondary breakers BR2_, BRH2_, and BRHH2_. The main circuit breaker rating can be selected to fit the installation, but the overall interrupt rating depends on the chosen main device. Always verify main-breaker compatibility and coordinate with the bus rating to ensure code compliance and safety.
Key specs include a 125A amperage rating, 120/208V, and a 1200A bus rating, with a five-jaw, two-socket configuration. It supports three-phase in and single-phase out, uses an aluminum bus, and provides an indoor/outdoor enclosure with ringless security and no bypass. These features support scalable metering in group metering configurations.
Ideal for multi-tenant residential buildings and light commercial facilities requiring group metering. The indoor/outdoor enclosure and five-jaw design simplify installation in tight spaces, while GA and TX utility approvals facilitate field acceptance. It integrates with standard Eaton metering accessories, enabling quick deployment in new builds or retrofit projects.
UL Listed certification is included, ensuring compliance with safety standards for electrical equipment. The unit also features utility approvals for Georgia Power and Texas-New Mexico Power, supporting acceptance in the field. With 120/208V and 125A ratings, the product aligns with common utility metering codes and protection requirements.
The meter stack reduces installation time with its compact footprint and standardized connections, lowering labor costs. Durable aluminum bus construction and indoor/outdoor rating improve reliability in harsh environments, reducing maintenance intervals. Combined with UL/utility certifications, it minimizes rework for compliance, delivering a faster project timeline and predictable lifecycle costs.