Eaton 3MM212R12RLB Residential Meter Stack - UL Listed
Part Number: 3MM212R12RLB
Quick Summary
Eaton 3MM212R12RLB residential meter stack enables multiple metering in outdoor service panels. Facility managers struggle with wiring complexity, space constraints, and code compliance when expanding metering. UL Listed certification supports safety and regulatory compliance for outdoor installations, while the unit’s 125A sockets and 1200A bus enable scalable service configurations. This solution integrates with residential metering products and outdoor electrical distribution to streamline installation, reduce field labor, and simplify asset management. In multi-tenant or mixed-use projects, the compact footprint and rugged design help you meet timelines without sacrificing reliability. Trust in Eaton’s metering lineage to support ongoing maintenance and future capacity upgrades.
Product Information
Extended Description
3MM212R12RLB Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Al, Bus:1200A, Horn bypass, Outdoor, 5-jaw, Depends on selected MCB,, Sockets:2, 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
3MM212R12RLB
UPC
782114786291
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
Catalog Notes
Fifth jaw included at 9oclock position
Type
Multiple metering
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM212R12RLB
Multiple metering within a single outdoor enclosure reduces cabinet count and simplifies tenant billing. This translates to lower capital spend and faster commissioning in multi-tenant properties. It’s particularly suitable for residential and light commercial applications where independent service measurement is required. The 125A socket rating paired with a 1200A bus supports scalable service distribution without upgrading the entire panel, reducing future upgrade costs and minimizing disruption during occupancy changes. Designed to accept standard MCB components and compatible Eaton accessories, it offers flexible configuration for evolving load profiles. With three-phase in and single-phase out capabilities, the stack accommodates common utility supply configurations while preserving selective metering for efficiency. Outdoor-rated construction and UL Listed certification ensure safe operation in exposed environments, helping meet code requirements and commissioning timelines. The fifth jaw included at the 9 o’clock position adds further flexibility for future expansions without rework. Installation-friendly features and compatibility with existing Eaton metering products streamline procurement and field setup, delivering measurable cost savings and faster time-to-value.
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FAQs
The 3MM212R12RLB is designed for outdoor service panels with a rugged enclosure, UL Listed safety, and a 1200A bus. Its 125A sockets and 2 sockets provide flexible metering capacity, while the fifth jaw option at 9 o'clock adds installation flexibility. This combination minimizes cabinet space and reduces field wiring complexity, accelerating commissioning in outdoor environments.
Key specs include 125A per socket, a 1200A bus rating, 3-phase in and single-phase out configuration, and outdoor-rated construction. The unit supports multiple metering in one enclosure and is UL Listed, ensuring safety and compliance for outdoor residential or light commercial applications. It is compatible with standard MCB components and Eaton accessories for streamlined integration.
Yes. The multiple metering capability in a single outdoor enclosure makes it ideal for multi-tenant or mixed-use buildings. It reduces cabinet counts, simplifies tenant-based billing, and supports independent service measurement. The 125A sockets and 1200A bus enable scalable deployment as tenants or service lines change, while preserving regulatory compliance with UL Listing.
The product carries UL Listed certification, which validates safety and compliance for outdoor electrical equipment. This certification helps meet national and local codes for outdoor metering installations and reduces risk during inspection and commissioning. Relying on UL Listed equipment also supports warranty terms and ongoing maintenance planning.
Plan for reduced field labor and faster commissioning thanks to integrated multi-metering and flexible jaw options. The rugged outdoor design minimizes service interruptions, while the possibility to expand using existing MCBs and accessories lowers future upgrade costs. The UL Listed rating provides assurance for long-term reliability and streamlined compliance management.