Eaton 3MM312R12RLC Residential meter stack - UL Listed
Part Number: 3MM312R12RLC
Quick Summary
The Eaton 3MM residential meter stack is a multi-metering solution ideal for multi-tenant and light commercial sites. It helps prevent billing errors and simplifies load management by consolidating meters into a single outdoor enclosure. The unit carries UL Listed certification for safety and compliance, and is designed for outdoor installation with rugged construction. For project teams, this metering stack supports 125A service, 3 sockets, 120/208VAC operation, and key MCB compatibility to streamline commissioning and ongoing maintenance. This design supports scalable metering for growing facilities and aligns with residential and light commercial deployment needs. Its modular nature and clear labeling simplify field installation and future expansions while reducing commissioning time.
Product Information
Extended Description
3MM312R12RLC Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Cu, 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, Ringless, Socket:125A, 120/208VAC
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM312R12RLC
UPC
786685512815
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
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM312R12RLC
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Multi-metering capability with 3-phase in, single-phase out and 125A service, bus 1200A. Business Impact: Enables efficient billing across tenants and optimized load distribution, reducing manual reconciliation and data gaps. Application: Ideal for residential and light commercial properties with multiple service panels. Feature: Outdoor-rated enclosure and UL Listed safety certification. Business Impact: Enables reliable external installation with proven safety and regulatory compliance, lowering risk during harsh weather and service interruptions. Application: Exterior metering installations for building common areas and shared infrastructure. Feature: Five-jaw design and three sockets. Business Impact: Streamlines wiring, speeds installation, and minimizes wiring errors, saving labor time during panel connections. Application: Quick deployment in turnkey metering stacks for new builds. Feature: No bypass configuration for accurate metering. Business Impact: Improves measurement integrity and reduces potential revenue loss from bypass-related inaccuracies. Application: Critical for precise sub-metering in multi-tenant facilities. Feature: Compatibility with Eaton MCB options BR2, BRH2, BRHH2, BRX2. Business Impact: Simplifies integration with existing Eaton protective devices, reducing commissioning risk and spare parts inventory. Application: Seamless retrofit and new builds using Eaton switchgear. Feature: Compact dimensional footprint and weight (12.26 in L Ă— 41.8 in H Ă— 7.01 in W, 57 lb). Business Impact: Facilitates space planning in crowded electrical rooms and upgrade projects, lowering installation challenges. Application: Suitable for retrofit projects and refurbished spaces where space is a premium. Feature: Comprehensive warranty (1 year from installation or 18 months from shipment). Business Impact: Provides predictable coverage and risk mitigation for project budgets. Application: Long-term asset management for property portfolios.
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FAQs
The 3MM312R12RLC is designed for outdoor use with three sockets and a 125A service, supporting three-phase in and single-phase out configurations. It integrates with Eaton protective devices (MCBs) and requires an appropriate outdoor-rated enclosure. When selecting compatible panels, verify BR-series MCB compatibility (BR2, BRH2, BRHH2, BRX2) to ensure a seamless fit and straightforward field wiring.
Key specs include multiple metering with three sockets, three-phase in and single-phase out, 125A service with a 1200A bus, outdoor-rated enclosure, and 120/208VAC operation. The unit weighs 57 lb and measures 12.26 in by 41.8 in by 7.01 in. It is UL Listed and ships with a one-year warranty from installation or 18 months from shipment.
Yes. The 3MM residential meter stack is explicitly designed for outdoor installation in multi-tenant or light commercial settings, providing multiple metering within a single enclosure. UL Listed certification supports safety and compliance, while the outdoor-rated design helps endure environmental conditions typical of exterior utility spaces and building exteriors.
The product is covered under Eaton’s warranty policy 25-000, offering one year from the date of installation or eighteen months from the date of shipment, whichever occurs first. This provides a clear risk-mitigation window for field issues, while Eaton's support resources and specification sheets help ensure proper installation and long-term reliability.
Official documentation includes the Residential and Light Commercial Metering Products catalog and the Eaton Specification Sheet for 3MM312R12RLC. Additionally, warranty guidance is available through the Selling Policy 25-000. Access to these resources supports accurate installation planning and informed procurement decisions.