Eaton 3MM420R12RLB Residential Meter Stack - UL Listed
Part Number: 3MM420R12RLB
Quick Summary
The Eaton 3MM420R12RLB residential meter stack is a multi-metering solution designed for outdoor electrical feeders in residential and light commercial settings. This product addresses the challenge of coordinating multiple meters within a compact, weather-rated enclosure while maintaining safe installation practices. UL Listed certification underpins safety and compliance for residential metering equipment, and its outdoor-ready construction supports harsh environments. By integrating robust metering capacity with a streamlined form factor, this stack delivers reduced enclosure footprint and improved service entry management. For engineers and procurement professionals, it also offers predictable installation timelines and strong warranty coverage to minimize lifecycle costs.
Product Information
Extended Description
3MM420R12RLB Eaton: Eaton 3MM residential meter stack, Multiple metering, 200A, Al, Bus:1200A, Horn bypass, Outdoor, Depends on 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, 120/208Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM420R12RLB
UPC
782114786369
Product Length/Depth
13.5 in
Product Height
64.5 in
Product Width
7.01 in
Product Weight
77 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 - 3MM420R12RLB
Feature → Business Impact → Application: Multiple metering capability enables centralized monitoring of several circuits and tenants, reducing separate meter enclosures and cutting installation complexity. This translates to lower labor costs and faster project completion for multi-tenant buildings and residential complexes. Application: outdoor residential metering stacks with 200A service and 1200A bus support scalable expansion while maintaining accessibility for maintenance. Feature → Business Impact → Application: Outdoor-rated construction improves reliability in weather-exposed environments, reducing downtime and replacement cycles. This is essential for feeder reliability in urban housing or campus settings. Feature → Business Impact → Application: 4-socket configuration with 3P in/1P out simplifies wiring, minimizes splices, and enhances fault isolation, improving safety and service continuity for 120/208Vac systems. Feature → Business Impact → Application: UL Listed certification ensures compliance with safety standards, easing procurement and audit processes for electrical installations. Feature → Business Impact → Application: Compact footprint and Eaton warranty support reduce total cost of ownership and provide confidence during commissioning in constrained spaces. Feature → Business Impact → Application: Compatibility with standard low-voltage distribution practices enables straightforward integration with existing Eaton or partner equipment, accelerating drawn-out design reviews and commissioning.
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FAQs
The 3MM420R12RLB is designed for outdoor residential metering and supports a 200A service with a 1200A bus. It features 4 sockets and a 3P in/1P out configuration, compatible with 120/208Vac systems, enabling straightforward integration into standard low-voltage distribution layouts.
Key specs include Type: Multiple metering, Catalog Number: 3MM420R12RLB, Weight: 77 lb, Dimensions: 64.5 in height Ă— 7.01 in width Ă— 13.5 in depth, and Voltage: 120/208Vac. It supports outdoor installation, horn bypass, and UL Listed safety certification.
Yes. With multiple metering, four sockets, and a 1200A bus, the unit is ideal for multi-tenant or multi-circuit feeder scenarios, enabling centralized metering while maintaining individual circuit visibility and simplified maintenance in outdoor installations.
The product is UL Listed, which confirms compliance with recognized safety standards for residential metering equipment. This certification supports procurement and regulatory audits and aligns with common warranty terms to mitigate installation risk.
The stack reduces enclosure footprint, consolidates metering, and simplifies wiring with 3P in/1P out configuration, leading to faster installation, fewer field splices, and lower lifecycle maintenance costs. Its outdoor-rated design and UL certification further reduce risk and downtime over the system’s life.