Eaton 3MM520R12 Residential Meter Stack - UL Listed
Part Number: 3MM520R12
Quick Summary
The Eaton 3MM520R12 residential meter stack delivers multi-metering for 200A service in a compact enclosure. Electricians and procurement teams face space constraints and wiring complexity when expanding metering. UL Listed certification supports code compliance and safety in both indoor and outdoor installations. In practice, this translates to faster deployments, predictable maintenance costs, and reliable energy monitoring. For engineers, the design supports easy compatibility with modular MCB configurations and 5-jaw sockets. From a procurement perspective, the stack simplifies inventory, reduces field labor, and aligns with Eaton's warranty policy. Its indoor/outdoor capability supports flexible site layouts while meeting safety and metering requirements across residential projects.
Product Information
Extended Description
3MM520R12 Eaton: Eaton 3MM residential meter stack, Multiple meter, 200A, Al, Bus:1200A, No bypass, Indoor/Outdoor, Depends on selected MCB, 5-jaw, Sockets:5, 3-ph in, 1-ph out, A-B, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ring, Socket:200A, 120/208V
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM520R12
UPC
786685010823
Product Length/Depth
13.5 in
Product Height
74.96 in
Product Width
6.87 in
Product Weight
106 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 - 3MM520R12
Feature → Business Impact → Application: Multi-metering in a single enclosure reduces cabinet space and eliminates multiple standalone cabinets, which translates to faster installation and lower labor costs on site. This streamlines project timelines for new builds and mid-life upgrades, especially in tight utility spaces. Application: Ideal for multi-tenant residential developments and light commercial installations where space efficiency and centralized metering are critical. Feature → Business Impact → Application: 200A service with a 1200A bus rating and 5-jaw sockets supports stable, scalable metering configurations without reworking the enclosure. This minimizes replacement cycles and supports future expansion with minimal disruption. Application: Suitable for retrofit projects and new construction where future load growth is anticipated. Feature → Business Impact → Application: Indoor/outdoor capability provides versatile placement options, reducing the need for weatherproof enclosures and enabling relocation flexibility. This elevates site planning, safety, and maintenance ease for varied climates. Application: Residential properties across different geographies and commercial spaces requiring adaptable installation. Feature → Business Impact → Application: Compatibility with various MCB selections (depends on the chosen MCB) ensures seamless integration with existing protection schemes, lowering install risk and service interruptions. Application: Retrofit programs and new builds where safety and protection coordination are paramount. Feature → Business Impact → Application: UL Listed certification and Eaton warranty support compliance confidence and predictable total cost of ownership, reducing risk in procurement and long-term operations. Application: Projects with stringent code requirements and service-level guarantees. Feature → Business Impact → Application: Comprehensive accessory and specification alignment — 120/208V, 3-ph in, 1-ph out, and 5 sockets — enables consistent metering architectures across sites, simplifying maintenance and training. Application: Field teams benefit from standardized installations and faster fault isolation.
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FAQs
Ideal installations place the meter stack in a location compliant with UL Listed requirements, suitable for indoor or outdoor use, and with access to proper mounting surfaces. The unit supports 200A service and 120/208V operation, with 3-phase in and 1-phase out configurations. Plan for a 1200A bus and five 5-jaw sockets to maximize compatibility with downstream MCBs and utility metering hardware.
The 3MM520R12 is designed as a multiple metering enclosure, enabling several meters to be housed within a single stack. Its 200A service rating and 120/208V capability, combined with a 1200A bus, support scalable metering layouts for multi-tenant or multifamily installations. This reduces space needs and simplifies wiring and commissioning compared with separate meter enclosures.
Yes, the 3MM520R12 is UL Listed, confirming compliance with established electrical safety standards. Eaton offers a warranty policy identified as 25-000, which provides one year from the date of installation or eighteen months from shipment, whichever occurs first. This warranty supports ongoing reliability and risk reduction for field deployments.
The meter stack measures 13.5 inches in depth, 74.96 inches in height, and 6.87 inches in width. It weighs 106 pounds, making it a substantial but manageable enclosure for standard meter rooms and exterior installations where mounting space and weight considerations are critical for planning and crane or lift requirements during installation.
Official resources include the Residential and Light Commercial Metering Products catalog (Volume 1 Tab 4) and the Eaton Specification Sheet for 3MM520R12. Access these documents to review installation guidelines, wiring diagrams, and compatibility data to support procurement and field engineering decisions.