Eaton 3MM312R12RLBC Meter Stack - UL Listed, 125A
Part Number: 3MM312R12RLBC
Quick Summary
Eaton 3MM312R12RLBC is a residential meter stack designed for multiplexed metering in commercial, multi-tenant, and outdoor installations. Engineers often struggle with space, access, and compliance when consolidating meters in outdoor enclosures. UL Listed certification supports safety and reliability in demanding outside environments. With a 125A service, a 1200A bus, three sockets, and three-phase-in, single-phase-out capability, it scales to growing facilities. This solution integrates readily with common MCBs and outdoor metering workflows, reducing installation time and ongoing maintenance costs. Coupled with Eaton's commitment to field support, it helps owners achieve faster payback through improved uptime and easier code compliance.
Product Information
Extended Description
3MM312R12RLBC Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Cu, Bus:1200A, Horn bypass, Outdoor, Depends on selected MCB, 5-jaw, Sockets:3, Three-phase in, single-phase out, B-C, BR2_, BRH2_, BRHH2_, BRX2, Ringless, Socket:125A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM312R12RLBC
UPC
786685512846
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
58 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
Catalog Notes
Fifth jaw included at 9oclock position
Type
Multiple metering
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM312R12RLBC
Feature: Integrated multi-meter capability. Business Impact: Consolidates meters, saving enclosure footprint and simplifying ownership. Application: Ideal for commercial buildings and outdoor campuses requiring compact, scalable metering. The unit reduces field labor during commissioning by offering plug-and-play MCB compatibility and a 5-jaw design. This translates to faster project delivery and lower total installation costs. Feature: 125A service with a 1200A bus and versatile MCB compatibility. Impact: Supports future expansion without replacing hardware, lowering capex and retrofit costs. Application: Utilities and retrofit projects that demand reliable bus architecture. Feature: Five-jaw design, Ringless sockets, and fifth jaw included at 9 o'clock. Impact: Ensures secure connections and simplifies installation, cutting commissioning time. Application: Teams configuring three-phase in and single-phase out circuits in constrained spaces. Feature: Outdoor-rated, UL Listed unit with horn bypass option. Impact: Delivers safety and weather resilience while meeting electrical codes; horn bypass supports service operations after maintenance. Application: Outdoor meter stacks in campuses and data centers. Feature: 120/208 VAC compatibility and three sockets for three-phase in, single-phase out. Impact: Enables flexible distribution with standardized components, accelerating timelines. Application: Modern facilities seeking a single metering solution for mixed-phase loads.
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FAQs
The 3MM312R12RLBC is designed for outdoor installations and requires a suitable weather-protected enclosure. It features a 125A service, a 1200A bus, and three sockets configured for three-phase in and single-phase out. Ensure proper MCB compatibility and align with the fifth jaw at the 9 o'clock position. Use UL Listed components and follow Eaton wiring and torque specifications to minimize heat and ensure code-compliant operation.
Yes. The meter stack supports three-phase in and single-phase out configurations via three sockets and a five-jaw design. It operates at 120/208 VAC and uses a 125A socket with a 1200A bus, allowing mixed-phase distribution in outdoor enclosures while maintaining safe, code-compliant metering. This configuration simplifies utility integration and supports rapid field deployment.
The unit provides multiple metering with a 125A service and a 1200A bus, plus three sockets for concurrent metering points. It is rated for outdoor use with UL Listed safety, offers ringless sockets, and accommodates various MCBs. This configuration simplifies tenant load monitoring, improves billing accuracy, and supports scalable expansion for growing facilities.
The meter stack carries UL Listed certification, confirming safety and reliability for electrical installations. It includes Eaton’s warranty of one year from the installation date or eighteen months from shipment, whichever comes first. This coverage reduces risk during commissioning and provides assured protection during the initial operating life for projects with strict uptime goals.
The solution is ready-to-install with a 5-jaw configuration, fifth jaw at 9 o'clock, and three sockets, which minimizes on-site adjustments. Its outdoor-rated design, 120/208 VAC compatibility, and straightforward MCB integration shorten field wiring and commissioning, delivering faster deployments and lower total labor costs for outdoor metering projects in industrial facilities and campuses.