Eaton 3MM420R12C Residential Meter Stack - UL Listed
Part Number: 3MM420R12C
Quick Summary
The Eaton 3MM420R12C is a modular residential meter stack designed for multi-metering in outdoor installations. Engineers often struggle with space efficiency, wiring complexity, and staying compliant during metering upgrades. This unit carries UL Listed certification and is built for outdoor use, simplifying code compliance for multi-tenant sites. By consolidating metering in a single stack, utilities and contractors realize faster install times, reduced wiring errors, and improved asset visibility in low-voltage power management and distribution. For project teams seeking scalable metering with proven Eaton support, this stack aligns with modern building automation and energy management strategies, while delivering reliable performance in residential and light-commercial applications.
Product Information
Extended Description
3MM420R12C Eaton: Eaton 3MM residential meter stack, Multiple metering, 200A, Cu, Bus:1200A, No by, Outdoor, Depends on selected MCB, 5-jaw, Sockets:4, 3-phase in, 1-phase 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
3MM420R12C
UPC
786685513249
Product Length/Depth
13.5 in
Product Height
64.5 in
Product Width
7.01 in
Product Weight
75 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 - 3MM420R12C
Feature: Multiple metering capability with 200A service, bus rating 1200A, 4 sockets, 5-jaw design, and 3-phase in with 1-phase out. Business Impact: Enables efficient multi-tenant metering within a single enclosure, reducing panel count and simplifying electrical room layouts. Application: Ideal for multi-residential builds or light commercial sites requiring consolidated metering in a robust outdoor-rated stack. Long-tail keywords such as residential meter stack, multi-metering, and metering products are addressed while delivering measurable time savings during installation. Feature: Outdoor-rated enclosure with substantial footprint (64.5 in height, 7.01 in width, 13.5 in depth) and 75 lb weight. Business Impact: Improves durability against weather exposure and reduces indoor space requirements, enabling faster outdoor deployments and safer handling by technicians. Application: Suitable for exterior meter housings in campuses, apartments, and mixed-use developments. Feature: Four sockets and a 200A socket arrangement (Socket: 200A) plus 3-phase in/1-phase out configuration. Business Impact: Supports flexible configuration and protection coordination with select MCBs, cutting accessory costs and enabling precise energy monitoring. Application: Essential for configurations where phase balance and metering accuracy are critical in low-voltage distribution networks. Feature: UL Listed certification and Eaton warranty policy (one year from installation or 18 months from shipment). Business Impact: Enables faster code approval and reduces risk with trusted safety standards, while the warranty provides post-sale support and confidence. Application: Required for compliance-focused projects in regulated markets and for OEM-backed assurance in service agreements. Feature: Compatibility with multiple metering features and options (A-B, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ring). Business Impact: Delivers extended interoperability with Eaton metering family and data capture solutions, enabling seamless integration into building management and energy analytics workflows. Application: Perfect for energy management initiatives, demand response programs, and building automation deployments.
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FAQs
The 3MM420R12C is engineered as a multiple metering solution with four sockets and a 200A service, enabling independent metering channels within a single outdoor stack. This design minimizes enclosure footprint, reduces wiring complexity, and simplifies data collection for energy management systems. It supports 3-phase in and 1-phase out configurations, making it suitable for multi-tenant or mixed-use facilities while maintaining code-compliant separation of circuits.
This meter stack is specified as outdoor-ready with a protective enclosure, designed to withstand external environments while maintaining electrical safety. The unit’s robust construction reduces indoor space needs and streamlines conduit routing to outdoor locations. For installers, the outdoor rating translates to fewer indoor renovations and faster project completion without compromising metering accuracy.
The 3MM420R12C supports multiple metering configurations with options dependent on the selected MCBs, including 3-phase inputs and 1-phase outputs, as well as high-current socket arrangements (Socket 200A and a 5-jaw design). This flexibility helps align protection coordination with existing utility or panel schedules and reduces the need for additional adapters or interface modules.
The primary certification for this product is UL Listed, which supports compliance with electrical safety standards and code requirements for metering equipment. Verify site-specific requirements, such as local amendments for outdoor meter enclosures, accessibility clearances, and coordination with utility metering policies. Always follow Eaton’s installation instructions and warranty terms to ensure long-term reliability.
Using the 3MM420R12C can reduce labor and material costs by consolidating metering into a single, outdoor-rated stack, lowering panel count and installation time. The UL Listed certification adds risk mitigation for compliance audits, and Eaton’s warranty coverage offers post-installation support. Over time, streamlined metering data capture supports energy analytics and optimization, yielding measurable efficiency gains.