Eaton 3MM520R Three-Phase Residential Meter Stack - UL Listed
Part Number: 3MM520R
Quick Summary
Eaton 3MM520R Three-Phase Residential Meter Stack enables reliable, scalable metering for multi-tenant properties. Facility managers often struggle with space constraints, wiring complexity, and utility approvals when upgrading outdoor metering. This UL Listed outdoor unit features rugged, ring-secured construction suitable for exterior installations, supporting secure group metering in residential developments. As a proven metering solution, it integrates with standard metering products to streamline procurement, enhance compliance, and reduce lifecycle costs for property owners and operators. For engineers and procurement teams, it delivers a dependable, future-ready platform that aligns with residential metering needs and growing power-management requirements.
Product Information
Extended Description
3MM520R Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 200A, Aluminum Bus 800 Ampere, No bypass, Outdoor ,Five-jaws, 5 Sockets ,Three-phase in, single-phase out ,Ring Security 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM520R
UPC
782116883868
Product Length/Depth
7.75 in
Product Height
75.75 in
Product Width
15 in
Product Weight
106 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
DC : Atlantic City Electric / Delmarva (Connectiv) DE : Atlantic City Electric / Delmarva (Connectiv) MD : First Energy (Potomac Edison) MD : Atlantic City Electric / Delmarva (Connectiv) NJ : Atlantic City Electric / Delmarva (Connectiv) NC : Dominion VA : Dominion MO : Empire District Electric OK : Empire District Electric AR : Entergy LA : Entergy MS : Entergy TX : Entergy ID : Idaho Power OR : Idaho Power WA : Seattle City Light AK : Anchorage Municipal Light & Power NV : NV Energy 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 MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy MD : Baltimore Gas and Electric DC : PEPCO MD : PEPCO IN : Indianapolis Power and Light (IP&L) WA : Puget Sound Energy WA : Tacoma Public Utilities
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
5
Phase balance
A-B
Security
Ring
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM520R
Selling Policy 25-000 - Distribution and Control Products and Services
Feature is three-phase in, single-phase out with a 200A rating and an 800A bus, constructed with aluminum. Business impact is efficient group metering for multi-tenant properties, reducing equipment count and installation time, while providing scalable capacity for future load growth. Application is ideal for residential metering in apartment complexes and mixed-use developments. Feature is outdoor enclosure with Ring Security, no bypass, five jaws, and five sockets. Business impact includes enhanced tamper resistance and weather resilience, improving reliability and reducing service calls. Application covers exterior meter stacks and outdoor utility rooms where security and durability matter. Feature includes broad utility approvals and UL Listed certification. Business impact is easier utility acceptance and compliance across jurisdictions, reducing project risk. Application spans multi-site deployments with consistent metering architecture. Feature notes that interrupt rating depends on the selected main circuit breaker. Business impact enables precise matching to project protection requirements, avoiding over- or under-specification. Application suitable for custom configurations in facilities requiring flexible protection levels. Feature highlights 120/208V operation, five-jaw design, and 5 sockets. Business impact supports compact, organized wiring and streamlined installation. Application supports three-phase in, single-phase out metering for efficient multi-line metering schemes.
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FAQs
The 3MM520R is designed for outdoor use with a height of 75.75 in, width of 15 in, and depth of 7.75 in, weighing 106 lb. Plan for secure outdoor mounting, adequate ventilation, and weather exposure protection. The unit supports five jaws and five sockets, enabling a compact, organized layout for group metering and easy future expansion.
Interrupt rating is dependent on the main circuit breaker selected for the installation. The 3MM520R provides a robust 800 A bus and 200 A main rating framework; selecting the appropriate main breaker ensures the assembly meets required protection levels while maintaining compatibility with common metering configurations.
Utility approvals are extensive and cover many regions, including Atlantic City Electric, Delmarva (Connectiv), First Energy (Potomac Edison), PEPCO, Dominion, and others listed in the product data. Always verify local utility acceptance prior to procurement to ensure smooth interconnection for multi-site deployments.
Eaton provides a warranty under Selling Policy 25-000: one year from the date of installation or eighteen months from shipment, whichever occurs first. The UL Listed certification supports compliance, while the warranty offers protection for installation-related issues and performance reliability during the initial period.
Yes. The unit supports three-phase in, single-phase out operation with secondary breaker options including CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, and CVH2_XMM. It uses aluminum bus with an 800 A rating and 200 A amperage, providing flexible integration with standard metering architectures and easy fit into existing electrical rooms or outdoor enclosures.