Eaton Residential Meter Stack 3MM412R12RL - UL Listed
Part Number: 3MM412R12RL
Quick Summary
Eaton residential meter stack is a compact three-phase metering solution designed for group metering in multifamily and light commercial facilities. Owners and engineers often struggle with space, wiring complexity, and metering accuracy when consolidating service connections; this module addresses those challenges with a compact footprint and straightforward wiring. Key certifications include UL Listed, with utility approvals in Georgia, Texas, and New Mexico supporting deployment across markets. Built for reliability and safety, it combines a 125A rating with an indoor/outdoor enclosure to fit a range of installation environments. The result is improved commissioning speed, better energy visibility, and reduced total cost of ownership through standardized metering and easier maintenance.
Product Information
Extended Description
3MM412R12RL Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 125A, Aluminum Bus 1200 Ampere, No bypass, Indoor/outdoor, Five-jaws, 4 Sockets, Three-phase in, single-phase out, Ringless Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM412R12RL
UPC
782114786239
Product Length/Depth
50.5 in
Product Height
8 in
Product Width
14.5 in
Product Weight
63 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
Group Metering
Utility approvals
GA : Georgia Power TX : Texas-New Mexico Power (TNMP) NM : Texas-New Mexico Power (TNMP)
Interrupt rating
Depends on selected main circuit breaker
Enclosure
Indoor/outdoor
Secondary circuit breaker
BR2_, BRH2_, BRHH2_
Bus Rating
1200 A
Phase
Three-phase in, single-phase out
Voltage rating
120/208V
Amperage Rating
125A
Bus material
Aluminum
Bypass
None
Number of jaws
Five-jaw
Number of sockets
4
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM412R12RL
Feature: 125A amperage rating with a 1200A bus rating enables scalable metering for group installations. Impact: Supports growth without early equipment changes and ensures reliable fault isolation. Application: Ideal for multi-tenant residential buildings and light commercial projects. Feature: Three-phase in, single-phase out with five jaws and four sockets. Impact: Simplifies wiring, reduces panel real estate, and streamlines protection coordination. Application: Group metering in shared service feeders and retrofit deployments. Feature: Aluminum bus material and a footprint of 50.5 in length, 14.5 in width, and 8 in height. Impact: Lighter weight for handling, corrosion resistance, and easier field installation in tighter spaces. Application: New builds or upgrades in space-constrained mechanical rooms. Feature: Indoor/outdoor enclosure with ringless security and no bypass. Impact: Enhances safety, theft deterrence, and reliability in varied environments. Application: Outdoor meter stacks at facility perimeters or entry points. Feature: UL Listed certification and utility approvals GA, TX, NM. Impact: Simplifies compliance and acceptance by utilities, speeding project sign-off. Application: Projects across Georgia, Texas, and New Mexico. Feature: Supports secondary breakers BR2_, BRH2_, BRHH2_ and allows the interrupt rating to be defined by the selected main circuit breaker. Impact: Provides design flexibility and safer coordination with downstream protection. Application: Customizable protection in new builds or upgrades.
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FAQs
This meter stack features a 50.5 in long, 14.5 in wide, and 8 in high enclosure designed for indoor/outdoor use. Plan for adequate clearance, secure mounting, and proper routing to accommodate five jaws and four sockets. The unit is compatible with BR2_, BRH2_, BRHH2_ secondary breakers and requires the main breaker to determine the interrupt rating. Follow Eaton installation guidelines and local codes to ensure safe, compliant operation.
Key specs include a 125A amperage rating, 120/208V voltage rating, 1200A bus rating, aluminum bus material, five-jaw, four-socket configuration, and three-phase in with single-phase out. The enclosure is indoor/outdoor, and there is no bypass. Interrupt rating depends on the main circuit breaker chosen, enabling flexible protection schemes for various installations.
Yes, the enclosure supports indoor/outdoor use, with ringless security for vandal resistance and no bypass for enhanced safety. It is UL Listed and designed to withstand installation in varied environments. When deploying outdoors, ensure proper weather protection, clearance, and correct secondary protection using BR2_, BRH2_, BRHH2_ as applicable.
The product lists utility approvals for GA Georgia Power, TX Texas-New Mexico Power (TNMP), and NM TNMP. These approvals support deployments across these markets, facilitating utility acceptance and faster project sign-offs in compliant jurisdictions.
Access the Eaton Residential and Light Commercial Metering catalogs and the Eaton Specification Sheet for 3MM412R12RL. The catalogs cover Metering Products Volume 1 Tab 4, and the spec sheet provides detailed electrical and mechanical data to assist in design, procurement, and installation planning.