Eaton 3MM420R12RLC Residential Meter Stack - UL Listed
Part Number: 3MM420R12RLC
Quick Summary
Eaton 3MM residential meter stack provides compact multi-metering for outdoor residential power distribution. Many projects struggle with space, wiring complexity, and meter access in tight exterior enclosures. UL Listed safety certification ensures code compliance and reliable operation in harsh environments. This solution supports 200A main feeds and 120/208 VAC service, enabling scalable metering while reducing installation time and risk for contractors and facility managers. The design aligns with outdoor metering standards, offering a 1200A copper bus, ringless sockets, and configurable MCB compatibility. By consolidating metering into a single stack, operators gain clearer visibility into energy usage and simplified bill reconciliation. Additionally, rugged construction supports field serviceability with accessible terminations for quick inspections and upgrades.
Product Information
Extended Description
3MM420R12RLC Eaton: Eaton 3MM residential meter stack, Multiple meter, 200A, Cu, Bus:1200A, No bypass, Outdoor, Depends on selected MCB, 5-jaw, Sockets:4, 3-ph in, 1-ph out, A-B, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ringless, Socket:200A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM420R12RLC
UPC
786685513171
Product Length/Depth
13.5 in
Product Height
64.5 in
Product Width
7.01 in
Product Weight
76 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 - 3MM420R12RLC
Feature: Integrated multi-metering with four sockets and 3‑ph in, 1‑ph out. Business impact: Minimizes separate metering hardware and reduces field wiring errors, accelerating commissioning on multi-dwelling or mixed-use sites. Application: Outfitting an outdoor meter stack for multiple tenants or solar/EV load monitoring in residential complexes.Feature: Ringless sockets and copper bus with 1200A bus rating and a 200A main feed. Business impact: Improves reliability in outdoor environments and supports future expansion without upgrading hardware. Application: Durable outdoor enclosures that demand quick service access and scalable metering.Feature: 200A maximum socket rating and 120/208 VAC service. Business impact: Compatibility with standard utility voltages reduces transformer steps and simplifies code compliance. Application: Commercial-residential feeders where standard voltage is required and metering accuracy matters.Feature: Modular compatibility with selected MCBs (CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM). Business impact: Allows tailored protection schemes and precise fault isolation, lowering retrofit costs. Application: Projects requiring configurable metering with plug-in breakers in outdoor enclosures.Feature: UL Listed certification ensures safety and compliance. Business impact: Facilitates code approvals, reduces risk during inspections, and supports long-term reliability. Application: Essential for contractor approvals and facility management in regulated markets.Feature: Warranty terms and service support. Business impact: Simplifies procurement and maintenance planning, reducing downtime risk and ensuring access to manufacturer resources. Application: Procurement decisions and long-term asset management for electrical distributors and integrators.
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FAQs
For outdoor installations, ensure the enclosure is rated for exterior use and provides adequate clearance for four sockets and the 3‑ph in / 1‑ph out configuration. Verify the 200A main and 120/208 VAC service compatibility, confirm copper bus connections, and reference the UL Listed certification in the product sheet. Follow Eaton's mounting instructions and local electrical codes for a safe, compliant setup.
The stack provides four metering sockets and a 3‑ph in / 1‑ph out layout, enabling monitoring for multiple tenants or circuits within a single outdoor enclosure. This reduces the need for additional standalone meters, lowers wiring complexity, and accelerates commissioning. Its configurable MCB compatibility allows tailored protection suitable for multi-tenant or mixed-use developments.
Yes, the 3MM420R12RLC is designed for outdoor use with rugged construction and ringless sockets to minimize exposure. The 120/208 VAC service and copper bus support reliable operation in varying weather conditions, while UL Listed certification confirms safety and code compliance under field conditions. Proper enclosure rating and installation practices are still required to maximize durability.
The primary certification is UL Listed, which demonstrates compliance with recognized safety standards for electrical equipment. This certification facilitates inspections and approvals by simplifying documentation and demonstrating reliability for code compliance. Always pair the product with the latest Eaton specification sheets to align with local requirements and utility expectations.
The meter stack consolidates metering into a single, modular enclosure, reducing field wiring and the number of components to maintain. This typically shortens installation time, lowers labor costs, and simplifies bill reconciliation by providing centralized energy data. The UL Listed certification further supports fewer compliance delays, contributing to quicker project ROI and improved long-term asset management.