Eaton 3MM312RRLB Residential Meter Stack - UL Listed
Part Number: 3MM312RRLB
Quick Summary
The Eaton 3MM residential meter stack provides multi-metering for outdoor service panels in mixed-use facilities, delivering compact, code-compliant monitoring where space is at a premium. Owners often struggle with space, labeling, and coordinating metering when expanding on-site monitoring. It carries UL Listed certification, reflecting adherence to safety and performance standards essential for metering installations across commercial and residential deployments. This solution simplifies outdoor metering with built-in compatibility for 125A service, 800A bus, horn bypass options, and rapid installation, while supporting scalable multi-metering to meet evolving energy monitoring needs. By combining reliability, ease of installation, and Eaton's warranty—with documented service support and spare-part availability—the solution helps reduce downtime, accelerate project timelines, and lower total cost of ownership over the system lifecycle.
Product Information
Extended Description
3MM312RRLB Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Al, Bus:800A, Horn bypass, Outdoor, Depends on selected MCB, 5-jaw, Sockets:3, Three-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ringless, Socket:125A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM312RRLB
UPC
786849052300
Product Length/Depth
12.26 in
Product Height
8.5 in
Product Width
7.01 in
Product Weight
48.75 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 - 3MM312RRLB
Feature → Business Impact → Application: The 3MM312RRLB provides true multi-metering capability for outdoor service panels, enabling centralized monitoring of multiple circuits with a single enclosure, which reduces wiring complexity and speeds commissioning. This directly improves energy visibility and fault-detection capabilities for mixed-use developments and retrofit projects. Application: ideal for outdoor meter stacks serving multifamily dwellings and light commercial facilities seeking efficient, scalable metering. Feature → Business Impact → Application: It supports 125A service with an 800A bus and offers three sockets in a 5-jaw configuration, including horn bypass and ringless sockets, which shortens installation time and enhances safety margins. Application: suitable for installations requiring quick routing of supply and load conductors with minimal field modification. Feature → Business Impact → Application: The unit operates with three-phase in and single-phase out, enabling flexible load management and compatibility with common utility metering schemes. Application: supports evolving energy strategies in new builds and renovations. Feature → Business Impact → Application: Outdoor-ready construction and UL Listed certification provide compliance confidence and reduced risk during inspections. Application: helps installers meet regulatory requirements while delivering reliable service in exposed environments. Feature → Business Impact → Application: Comprehensive documentation, including catalog and datasheet references, supports procurement, design, and maintenance planning. Application: streamlines asset management for facilities teams and engineering departments.
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FAQs
Outdoor installations require weather-rated enclosures with accessible wiring rooms and adequate clearance for cable entries. The 3MM312RRLB supports 125A service and an 800A bus, uses three sockets with a 5-jaw configuration, and offers horn bypass and ringless sockets. Ensure correct wiring for three-phase in, single-phase out configurations and adhere to local electrical codes during mounting and interconnection.
The unit is built for multiple metering with three sockets and a 5-jaw configuration, enabling practical configurations for three-phase inputs and single-phase outputs. It supports 125A service and an 800A bus, making it suitable for scenarios requiring flexible phase arrangement and efficient conductor termination in outdoor service enclosures.
Yes. The Eaton 3MM312RRLB is designed for outdoor use and multi-metering in residential and light commercial settings. Its 125A service and 800A bus capacity accommodate common apartment, townhouse, and small business load profiles. The combination of space efficiency, ease of installation, and UL Listed safety supports quick deployment in both new builds and retrofit projects.
The product carries UL Listed certification, which confirms adherence to recognized safety and performance standards for electrical equipment. This certification simplifies inspections, supports code compliance, and reduces vendor risk during procurement and project approvals for outdoor metering installations.
Buyers can expect robust reliability backed by Eaton’s warranty policy, typically one year from installation or eighteen months from shipment. The stack’s modular metering approach, ringless sockets, and horn bypass options reduce maintenance needs and field labor. Over the system life cycle, these features translate to lower downtime, faster commissioning, and improved total cost of ownership.