Eaton 3MM320R12C Residential Meter Stack - UL Listed
Part Number: 3MM320R12C
Quick Summary
The Eaton 3MM320R12C residential meter stack is designed for multi-meter installations in outdoor residential and light-commercial service panels. Engineers often struggle with space constraints, wiring complexity, and the time required to ensure safe, regulator-ready metering. Its UL Listed certification, outdoor-ready enclosure, and 200A service rating help meet safety standards and load needs. Combined with compatible MCBs and socket configurations, the stack supports fast deployment, accurate billing, and reduced field labor. With simple, standardized connections and clear documentation, it minimizes commissioning time and scales across facilities. In practice, the 3MM320R12C improves panel balance for 3-ph in, 1-ph out configurations and outdoor applications.
Product Information
Extended Description
3MM320R12C Eaton: Eaton 3MM residential meter stack, Multiple metering, 200A, Cu, Bus:1200A, No bypass, Outdoor, Depends on selected MCB, 5-jaw, Sockets:3, 3-ph in, 1-pha out, A-B, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ring, Socket:200A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM320R12C
UPC
786685513096
Product Length/Depth
13.5 in
Product Height
52.35 in
Product Width
7.01 in
Product Weight
69 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 - 3MM320R12C
Multiple metering with a 200A service and a 1200A bus rating enables true multi-meter capability within a single enclosure, reducing material costs and simplifying panel layouts. This translates to faster installations in outdoor residential and light-commercial service panels where space is at a premium and zoning constraints are common. Feature: 120/208 VAC operation and standard 5-jaw sockets. Business impact: Ensures compatibility with common utility and building electrical systems, cutting wiring adapters and on-site labor. Application: New builds and retrofits that rely on standard U.S. voltages and plug-and-socket configurations. Feature: Sockets: 3; 3-ph in, 1-ph out; No bypass. Business impact: Minimizes miswiring and improves monitoring accuracy by routing all measured energy through the meters. Application: Multi-meter networks in outdoor panels where precise phase balance is critical. Feature: Outdoor-rated enclosure and UL Listed certification. Business impact: Provides weather resilience and regulatory compliance, reducing risk during commissioning and long-term operation. Application: Outdoor service entrances in residential and light-commercial environments. Feature: Compatibility with MCBs and standardized Eaton metering sockets. Business impact: Accelerates procurement, spare-part compatibility, and field upgrades, lowering total cost of ownership. Application: Retrofit projects and new installations across multiple buildings.
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FAQs
The 3MM320R12C is designed for outdoor multi-meter installations in residential and light-commercial service panels. Installers should follow local codes, use the UL Listed enclosure, and connect the 3-ph in / 1-ph out configuration with 120/208 VAC supply. Ensure proper labeling, clearances, and matching Eaton MCBs for a safe, compliant retrofit or new build.
Key specs include a 200 A nominal service rating, a 1200 A bus rating, 120/208 VAC operation, sockets configured for three meters, and a 3-ph in / 1-ph out arrangement with no bypass. The unit is UL Listed and intended for outdoor use, supporting multi-meter configurations in a single enclosure.
Yes. The unit is explicitly designed for outdoor residential and light-commercial metering, featuring an outdoor-rated enclosure and UL Listed certification. Its 200A service capability and 120/208 VAC compatibility support reliable outdoor metering without compromising safety or regulatory compliance.
The product carries UL Listed certification, validating safety and compliance for electrical equipment used in residential and light-commercial metering. This certification supports regulatory acceptance, safer field installations, and predictable performance in diverse climates when deployed with standard Eaton components.
The 3MM320R12C carries Eaton’s warranty policy of one year from installation or eighteen months from shipment, whichever occurs first. ROI benefits arise from reduced hardware footprint, faster installations, and minimized field labor due to multi-meter capability and compatible MCB integration, resulting in lower total cost of ownership over the system’s life cycle.