Eaton 1MM312RRLB Residential Meter Stack - UL Listed
Part Number: 1MM312RRLB
Quick Summary
Eaton residential meter stack is a multi-metering enclosure designed for residential and light commercial electrical panels. This solution helps property owners and engineers accurately bill tenants while consolidating metering in a single, code-compliant enclosure. UL Listed and built with a rugged NEMA 3R enclosure, it is suitable for outdoor or damp indoor locations and supports 120/240 V single-phase service. With a 125 A service and a 400 A bus rating, it scales to growing buildings and higher load demands. The four-jaw, ringless design paired with horn bypass and compatible BR2_, BRH2_, BRHH2_ breakers simplifies installation, reduces commissioning time, and enhances reliability for energy management programs.
Product Information
Extended Description
1MM312RRLB Eaton: Eaton residential meter stack, Multiple metering, 125A, Al, 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
1MM312RRLB
UPC
786849052225
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
52 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
Amperage Rating
125A
Bus material
Aluminum
Bus Rating
400 A
Bypass
Horn
Number of jaws
Four-jaw
Number of sockets
3
Phase
Single-phase in, single-phase out
Security
Ring
Voltage rating
120/240 V
Utility approvals
IA : Alliant (IP&L and WP&L) WI : Alliant (IP&L and WP&L) NY : Central Hudson Gas & Electric (CHG&E) IL : Commonwealth Edison (ComEd) / CECHA MI : Consumers Energy OH : Dayton Power and Light (DP&L) MD : First Energy (Potomac Edison) VA : First Energy (Potomac Edison) WV : First Energy (Mon Power) NJ : First Energy (Jersey Central Power and Light) OH : First Energy (Ohio Edison, Toledo Edison, The Illuminating Company) PA : First Energy (Allegheny Power, MET ED, Penelec, West Penn Power) NY : Orange & Rockland Utilities PA : PECO Energy WI : WE Energies / Wisconsin Public Service (WPS) PA : Pennsylvania Power & Light (PPL) NY : Rochester Gas & Electric (RG&E) NY : New York State Electric & Gas (NYSEG) KY : Louisville Gas & Electric/Kentucky Utilities
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 - 1MM312RRLB
Feature: Multi-metering capability with 125 A rating and 3 sockets enables separate service points for multiple tenants. Impact: Streamlines tenant billing, reduces shared-meter disputes, and supports utility program requirements. Application: Ideal for multi-tenant residential buildings, mid-rise housing, and small commercial spaces. Feature: Aluminum bus material rated at 400 A with four-jaw design for single-phase in/out. Impact: Lighter weight and robust conductor routing improve installation speed and long-term reliability, while tolerating higher fault current protection. Application: Main distribution and service panels in space-constrained environments. Feature: NEMA 3R enclosure with horn bypass and ring security features. Impact: Weather resistance and secure operation minimize downtime and tampering risk in outdoor or semi-exposed installations. Application: Outdoor meter stacks at building exteriors or damp locations. Feature: Compatibility with BR2_, BRH2_, BRHH2_ secondary circuit breakers. Impact: Flexible protection options simplify upgrades and code-compliant configurations. Application: Retrofit projects and new installations requiring modular, compliant metering. Feature: 120/240 V single-phase in/out design with four-jaw 3-socket configuration. Impact: Simplifies wiring, reduces misconnection risk, and supports standard residential service voltages. Application: Residential feeders, multi-tenant dwellings, and light commercial metering.
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FAQs
Plan for proper panel enclosure mounting, maintain required clearances for conductor routing, and verify compatibility with BR2, BRH2, and BRHH2 secondary breakers. Ensure correct wiring sequence for single-phase in/out, observe 120/240 V service, and confirm rated bus capacity aligns with the main protection device to meet local codes and utility requirements.
The stack supports 125 A service with a 400 A bus rating and uses 120/240 V single-phase in/out. The four-jaw, 3-socket configuration simplifies connections, while horn bypass provides maintenance access. Aluminum bus material reduces weight, and UL Listing confirms compliance with safety standards, helping maintain reliable metering for accurate energy accounting.
Yes. Its multi-metering capability, 125 A service rating, and four-jaw design enable separate metering points for multiple tenants within a single enclosure. The NEMA 3R enclosure supports outdoor or damp locations, aiding exterior installations common in multi-dwelling complexes, while compatibility with BR2/BRH2/BRHH2 breakers supports scalable protection schemes.
The Eaton 1MM312RRLB is UL Listed and features a NEMA 3R rated enclosure, delivering weather resistance suitable for outdoor installation. These certifications support regulatory compliance for residential and light commercial metering projects and help streamline permitting and interconnection with utility programs.
The product is covered by Eaton’s standard warranty policy: one year from installation or eighteen months from shipment, whichever occurs first. This coverage supports replacement, repair, and technical support, reducing downtime and ensuring energy-management objectives remain on track for property owners and operators.