Eaton 1MM312RRLBC Residential Meter Stack - UL Listed
Part Number: 1MM312RRLBC
Quick Summary
Eaton residential meter stack provides multi-metering in a compact enclosure for single-phase service in multi-tenant facilities. It addresses wiring chaos and slow fault isolation by consolidating meters without sacrificing accessibility. UL Listed and built with a NEMA 3R enclosure, it supports reliable indoor and weather-protected outdoor installations. With a four-jaw copper bus, 125A rating, and 800A bus capacity, the stack scales to meet growing metering needs across tenants. This solution aligns with energy management initiatives and scalable metering strategies, delivering reliability, faster fault isolation, and reduced installation labor for building owners and electrical contractors.
Product Information
Extended Description
1MM312RRLBC Eaton: Eaton residential meter stack, Multiple metering, 125A, Copper, Bus: 800A, Horn bypass, NEMA 3R, Depends on selected main circuit breaker, Four-jaw, 3, Single-phase in/single-phase out, BR2_, BRH2_, BRHH2_, Ringless, 120/240V
Product Name
Eaton residential meter stack
Catalog Number
1MM312RRLBC
UPC
782114989876
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
54 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
For indoor applications where a top endwall with knockouts is needed, order (1) of MM12N1WLK. 1MM units do not come with 5th jaw.
Type
Multiple metering
Amperage Rating
125A
Bus material
Copper
Bus Rating
800 A
Bypass
Horn
Number of jaws
Four-jaw
Number of sockets
3
Phase
Single-phase in, single-phase out
Security
Ringless
Voltage rating
120/240 V
Enclosure
NEMA 3R
Interrupt rating
Depends on selected main circuit breaker
Secondary circuit breaker
BR2_, BRH2_, BRHH2_
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 1MM312RRLBC
Feature to business impact to application pattern: Feature: Multi-metering enclosure design enables centralized monitoring across tenants, reducing field wiring and improving maintenance efficiency; Application: ideal for multi-tenant residential buildings and light commercial spaces. Benefit: simplifies meter management, shortens commissioning time, and supports accurate energy accounting. Feature: NEMA 3R enclosure with 120/240 V capacity provides indoor use with weather protection; Application: indoor electrical rooms or protected exterior installations; Benefit: extends service life, reduces weather-related downtime, and lowers replacement costs. Feature: 125A amperage rating with 800A bus rating allows scalable metering and future expansion; Application: growing tenant counts or evolving load profiles; Benefit: minimizes retrofit requirements and extends cabinet compatibility with main breakers BR2_, BRH2_, BRHH2_. Feature: Four-jaw, ringless copper bus with horn bypass supports quick, safe connections and easy maintenance; Application: single-phase in/out metering for compact footprints; Benefit: faster wiring, lower maintenance time, and improved fault isolation. Feature: Compatibility with MM12N1WLK top endwall option enhances installation flexibility; Application: when top endwall knockouts are needed in indoor spaces; Benefit: streamlines retrofit projects and reduces project risk for installers. Feature: UL Listed certification and robust enclosure standards provide regulatory confidence; Application: compliance-focused procurement for utilities and property managers; Benefit: reduces risk of non-compliance and supports audit readiness. This structured approach reflects industry realities in energy-management metering products and reinforces decisions with tangible efficiency and cost benefits.
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FAQs
Designed for indoor use with optional top-endwall knockouts, the unit fits single-phase in/out metering in multi-tenant facilities. It uses a NEMA 3R enclosure and features four-jaw copper bus and a 125A main with an 800A bus rating, enabling scalable metering in compact spaces.
Key specs include 125A amperage rating, 800A bus rating, copper bus material, four-jaw configuration, 3 sockets, 120/240 V, ringless security, and horn bypass for service isolation. It is built for single-phase in/out metering with a NEMA 3R enclosure.
Yes, this Eaton meter stack is UL Listed and uses a NEMA 3R enclosure, offering reliable indoor use and weather-protected outdoor installations in appropriate environments.
Warranty is Eaton’s policy: one year from date of installation or eighteen months from shipment, whichever comes first, providing coverage for manufacturing defects and early-life issues.
By consolidating meters in a single enclosure with a scalable 125A main and 800A bus, it reduces wiring complexity, speeds commissioning, and improves tenant metering accuracy, supporting energy-management initiatives and faster time-to-value for multi-tenant buildings.