Eaton 3MM312RRLC Residential Meter Stack - UL Listed
Part Number: 3MM312RRLC
Quick Summary
The Eaton 3MM312RRLC residential meter stack enables multi-metering for service panels in multi-tenant and commercial buildings. Building owners often struggle with space constraints and wiring complexity when expanding metering across units, needing a compact, scalable solution. This unit carries UL Listed safety certification and is backed by Eaton's warranty policy 25-000 for reliable performance. For contractors and specifiers, this outdoor-ready, five-jaw meter stack integrates smoothly with residential metering products and BR-series MCB configurations, delivering a practical, future-proof option for outdoor metering upgrades and energy management.
Product Information
Extended Description
3MM312RRLC Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Cu, Bus:800A, No bypass, Outdoor, Depends on selected MCB, Five-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
3MM312RRLC
UPC
782114990742
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
57 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 - 3MM312RRLC
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Multiple metering supports separate energy accounting for each unit. Business Impact: Enables precise load profiling, improves tenant billing accuracy, and reduces panel sprawl. Application: Ideal for multi-tenant residential and light commercial buildings that require scalable energy management without duplicating equipment. Feature: 125A service and 120/208 VAC operation with three-phase in, single-phase out. Business Impact: Accommodates common utility voltages and on-site equipment, streamlining coordination and future expansion. Application: Suited for outdoor stacks in shared meter rooms or exterior bays. Feature: Five-jaw sockets; Ringless, no bypass. Business Impact: Ensures secure terminations, simplifies installation, and enhances fault isolation. Application: Preferred in BR-series and BRX-style circuit configurations. Feature: Copper bus rated 800A; Outdoor enclosure; UL Listed. Business Impact: Delivers high-capacity reliability with weather-ready durability, reducing maintenance cycles. Application: Fits outdoor metering in mixed-use properties. Feature: Warranty and documentation availability. Business Impact: Provides long-term support and risk mitigation for procurement teams. Application: Useful for compliance reviews and specification alignment with Eaton catalogs.
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FAQs
Plan for outdoor, weather-protected mounting with UL Listed compliance. The 3MM stack supports outdoor installation and uses a five-jaw, 125A socket arrangement with three sockets for three-phase in and single-phase out. The unit weighs 57 lb and measures 41.8 in high by 7.01 in wide, fitting typical multi-meter enclosures. Ensure correct MCB selection, bus rating 800A, and space for wiring.
It enables multiple metering with a 125A service rating, copper conductors, copper bus rated to 800A, and operation at 120/208 VAC. It provides three-phase in and single-phase out through five-jaw sockets, is UL Listed, and designed for outdoor environments, compatible with common MCB configurations.
Compatibility depends on the selected MCBs; the design supports multiple metering and BR-series options (BR2_, BRH2_, BRHH2_, BRX2). Verify with Eaton's catalog to ensure MCBs match the 5-jaw, 125A socket arrangement and the intended BR-series circuit topology.
Warranty follows Eaton Selling Policy 25-000: one year from installation or 18 months from shipment, whichever occurs first. UL Listed status provides safety compliance, and Eaton offers specification sheets and warranty guides to support procurement, installation, and long-term performance.
It enables precise submetering across units, reduces wiring complexity, and supports outdoor installation. With an 800A bus, 125A service, and 120/208 VAC compatibility, it scales for future loads, lowers maintenance costs, and improves energy management and tenant billing accuracy in shared utility environments.