Eaton 3MM220R Residential Meter Stack - UL Listed Outdoor

Part Number: 3MM220R
Manufacturer
Eaton
Part number
3MM220R

Quick Summary

Eaton 3MM220R residential meter stack provides compact, three-phase metering for multi-tenant buildings. For engineers and procurement teams, this design reduces installation time and minimizes field wiring complexity by consolidating metering in a single outdoor enclosure. Certifications include UL Listed; while SIL, CE, or IP ratings are not specified for this variant, UL listing covers essential safety compliance for outdoor metering. The solution supports 120/208V service and, as a rugged outdoor meter stack with a five-jaw, two-socket configuration, enables reliable group metering for residential and light commercial projects.

Product Information

Extended Description

3MM220R Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 200A, Aluminum Bus 800 Ampere, No bypass, Outdoor, Five-jaws, 2 Sockets, Three-phase in, single-phase out, Ring Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM220R
UPC
786849052010
Product Length/Depth
50.5 in
Product Height
8 in
Product Width
16 in
Product Weight
65 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
MD : First Energy (Potomac Edison) AL : Alabama Power DC : Atlantic City Electric / Delmarva (Connectiv) DE : Atlantic City Electric / Delmarva (Connectiv) MD : Atlantic City Electric / Delmarva (Connectiv) NJ : Atlantic City Electric / Delmarva (Connectiv) TX : CenterPoint Energy (HL&P/Reliant) NC : Dominion VA : Dominion MI : DTE Energy (Detroit Edison) NM : El Paso Electric TX : El Paso Electric MO : Empire District Electric OK : Empire District Electric AR : Entergy LA : Entergy MS : Entergy TX : Entergy CA : City of Los Angeles - DWP (LADWP) AZ : Southern California Edison CA : Southern California Edison CA : Pacific Gas and Electric (PG&E) CA : Sacramento Municipal Utility District (SMUD) TN : Nashville Electric Service CA : PacifiCorp/Pacific Power/Rocky Mountain Power ID : PacifiCorp/Pacific Power/Rocky Mountain Power OR : PacifiCorp/Pacific Power/Rocky Mountain Power UT : PacifiCorp/Pacific Power/Rocky Mountain Power WA : PacifiCorp/Pacific Power/Rocky Mountain Power WY : PacifiCorp/Pacific Power/Rocky Mountain Power HI : Hawaiian Electric MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy MD : Baltimore Gas and Electric DC : PEPCO MD : PEPCO AZ : Tucson Electric Power/ UniSource AZ : Sulphur Springs Valley Electric Coop IN : Indianapolis Power and Light (IP&L)
Interrupt rating
Depends on selected main circuit breaker
Enclosure
Outdoor
Secondary circuit breaker
CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM
Bus Rating
800 A
Phase
Three-phase in, single-phase out
Voltage rating
120/208V
Amperage Rating
200A
Bus material
Aluminum
Bypass
None
Number of jaws
Five-jaw
Number of sockets
2
Phase balance
A-B
Security
Ring
Feature: Three-phase in, single-phase out with a 200A rating and an 800A aluminum bus. Business Impact: Supports high-load residential and small commercial feeders within a compact footprint, reducing space requirements and material costs. Application: Ideal for multi-tenant developments and mixed-use properties where centralized metering accelerates commissioning. Feature: Outdoor enclosure designed for weather exposure and robust field conditions. Business Impact: Improves durability, minimizes service interruptions, and lowers maintenance cycles in outdoor installations. Application: Suitable for rooftop or exterior walls where meter stacks must withstand environmental elements. Feature: Five-jaw configuration with two sockets and ring security. Business Impact: Facilitates secure, scalable connections while simplifying wiring topology and reducing connector errors. Application: Group metering for multiple tenants, with tamper-resistance built into the enclosure design. Feature: Compatibility with secondary breakers (CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM). Business Impact: Provides flexible protection options and easier retrofits or upgrades without replacing the entire stack. Application: Useful in retrofit projects and utility-aligned installations. Feature: 120/208V, aluminum bus, and UL Listed certification. Business Impact: Ensures standard utility voltages are supported, enhances safety compliance, and streamlines utility approvals. Application: Common in residential metering and light commercial deployments across jurisdictions. Feature: Utility approvals coverage and outdoor-rated performance. Business Impact: Reduces site-walks and verification time by leveraging pre-approved utility compatibility. Application: National and regional projects requiring verified utility compatibility for group metering.

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FAQs

The 3MM220R is ideal for multi-tenant residential and light commercial buildings requiring outdoor group metering. It provides three-phase in, single-phase out with a 200A rating and an 800A aluminum bus, enabling centralized metering across multiple units while maintaining standard 120/208V service.
Key specs include a 200A amperage rating, 800A bus rating, aluminum bus material, 120/208V, and outdoor enclosure. It supports five jaws and two sockets, with a three-phase in and single-phase out configuration and no bypass option, ensuring a secure metering layout.
Yes, the 3MM220R is UL Listed for safety. It also lists extensive utility approvals per model documentation, supporting easier utility acceptance for outdoor group metering installations across multiple regions.
By consolidating meters in a single outdoor stack, it reduces installation time, on-site wiring complexity, and future upgrade costs. The rugged enclosure and aluminum bus decrease maintenance in harsh environments, delivering lower lifecycle costs for multi-tenant properties.
Eaton offers a one-year warranty from installation or an 18-month window from shipment, whichever occurs first. This provides predictability for procurement and helps justify maintenance budgeting for new metering infrastructure.