Eaton 3MM520RRLC Residential Meter Stack - UL Listed
Part Number: 3MM520RRLC
Quick Summary
The Eaton 3MM520RRLC residential meter stack provides robust group metering capabilities for outdoor, multi-tenant applications. This three‑phase in, single‑phase out design addresses the need for secure, scalable metering in compact footprints while withstanding outdoor environments. By delivering a dedicated 200A main with an 800A bus rating, it supports reliable service distribution without compromising safety. UL Listed certification and Dominion utility approvals underscore compliance and install confidence, reducing project risk. For engineers and procurement teams, this solution translates to faster commissioning, streamlined inventory, and improved lifecycle value in modern metering deployments. Leverage its rugged enclosure and ringless security to lower tampering risk while maintaining accurate, auditable metering for residential portfolios and small commercial sites.
Product Information
Extended Description
3MM520RRLC Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering, 200A, Copper Bus 800 Ampere, No bypass, Outdoor, Five-jaws, 5 Sockets, Three-phase in, single-phase out A-B phase Balance, Ringless Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM520RRLC
UPC
782116928156
Product Length/Depth
76 in
Product Height
8 in
Product Width
16 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
NC : Dominion VA : Dominion
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
Copper
Bypass
None
Number of jaws
Five-jaw
Number of sockets
5
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM520RRLC
Feature: Three-phase in, single-phase out configuration. Business Impact: Enables efficient group metering for multi-tenant properties with simplified wiring and reduced switchgear complexity. Application: Ideal for residential buildings and small commercial sites requiring dependable phase balance (A-B) and clear metering paths. Feature: Copper bus with 800 A bus rating and 200 A amperage. Business Impact: Supports high fault tolerance and future load growth, lowering downtime risk and upgrade costs. Application: Large outdoor meter stacks where durable copper conductors ensure low impedance connections. Feature: Outdoor enclosure with five-jaw, five sockets and no bypass. Business Impact: Provides weather-resistant, tamper-resistant metering with straightforward maintenance and no bypass paths to compromise service. Application: Exterior installations subject to environmental exposure in utility-grade metering. Feature: Ringless security design. Business Impact: Reduces tampering opportunities and simplifies visual inspection, improving site security and compliance. Application: Outdoor meter installations in public or accessible spaces. Feature: Certifications and utility approvals (UL Listed; Dominion NC/VA). Business Impact: Ensures regulatory compliance and smoother utility interconnection, reducing project delays. Application: Projects requiring formal UL validation and approved utility coordination. Feature: Five-jaw, five sockets with A-B phase balance. Business Impact: Streamlines connection points and phase measurement accuracy, accelerating commissioning. Application: Group metering for multi-dwelling and mixed-use developments. Feature: Dimensions and weight (76 in L, 16 in W, 8 in H, 106 lb). Business Impact: Manageable footprint for retrofit or new builds, enabling practical installation in constrained spaces. Application: Site planning for outdoor meter stacks in utility-driven deployments.
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FAQs
Install the outdoor meter stack using the five-jaw design and five sockets to connect phase conductors for three-phase in and single-phase out. Ensure proper enclosure mounting, secure bus connections with copper conductors, verify 120/208V voltage rating, and align with Dominion utility requirements. Follow Eaton's installation guidelines and verify no bypass configuration to maintain ringless security.
The unit supports a 200A amperage rating with an 800A bus rating, copper bus material, and a 120/208V voltage rating. The configuration is three-phase in and single-phase out, with five-jaw and five sockets, and phase balance in the A-B configuration. The interrupt rating depends on the selected main circuit breaker.
Yes. It is designed for group metering with outdoor installation, providing three-phase in and single-phase out, A-B phase balance, five sockets, ringless security, and UL Listed certification to support reliable, auditable metering for multi-tenant scenarios.
The unit is UL Listed and carries Dominion utility approvals (NC: North Carolina, VA: Dominion). These certifications facilitate compliance and smoother interconnection with local utilities during project commissioning.
Warranty is defined by Eaton's policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This covers manufacturing defects and supports service planning for metering installations.