Eaton 3MM420R12RL Residential Meter Stack - UL Listed
Part Number: 3MM420R12RL
Quick Summary
Eaton 3MM420R12RL residential meter stack provides outdoor group metering for three-phase to single-phase distribution. In demanding installations, engineers face space constraints, weather exposure, and wiring complexity that slow projects and increase risk. This unit combines a rugged outdoor enclosure with a 1200 A aluminum bus and a five-jaw configuration to streamline field terminations and reduce labor. It carries UL Listed certification and is approved by Georgia Power and Texas-New Mexico Power, supporting regulator and utility acceptance. The design supports 120/208V systems and a 200A main, enabling scalable metering for multi-tenant or commercial facilities. Together, these features translate to faster deployments, better reliability, and lower total cost of ownership for utility-grade metering programs.
Product Information
Extended Description
3MM420R12RL Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 200A, Aluminum Bus 1200 Ampere, No bypass, Outdoor, Five-jaws, 4 Sockets, Three-phase in, single-phase out, Ringless Security, 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM420R12RL
UPC
782114786284
Product Length/Depth
67 in
Product Height
7 in
Product Width
16 in
Product Weight
76 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
Outdoor
Secondary circuit breaker
CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM
Bus Rating
1200 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
4
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM420R12RL
Selling Policy 25-000 - Distribution and Control Products and Services
Outdoor enclosure and 1200 A aluminum bus deliver robust durability in exposed environments. Business impact: superior weather resistance, lower corrosion risk, and extended service life reduce maintenance costs and downtime. Application: ideal for exterior residential and light-commercial meter stacks, where reliable performance under harsh conditions is essential. Feature: five-jaw terminal block with four sockets and a three-phase in, single-phase out configuration. Business impact: simplifies conductor termination, accelerates commissioning, and minimizes field errors. Application: supports group metering setups in multi-tenant buildings and outdoor service entrances. Feature: ringless security design with no bypass. Business impact: improves tamper resistance and safety, helping utilities meet security requirements. Application: critical in meter enclosures exposed to public access or high-traffic installations. Feature: interrupt rating is defined by the selected main circuit breaker. Business impact: allows tailored protection aligned with system demand and selectivity, reducing unnecessary downtime. Application: ensures compliant coordination with upstream devices for 120/208V, 200A feeders. Feature: utility approvals from GA and TX (Georgia Power, TNMP). Business impact: streamlines permitting, improves project approvals, and supports utility interconnection. Application: suitable for projects requiring utility acceptance in the southeastern United States. Feature: UL Listed certification and a clear warranty policy (one year from installation or 18 months from shipment). Business impact: provides formal safety certification and predictable coverage to manage lifecycle costs. Application: supports procurement, service planning, and risk mitigation across metering programs.
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FAQs
Start with a compliant outdoor mounting location and ensure the enclosure is rated for outdoor use. The unit relies on a main circuit breaker to establish the interrupt rating, and supports secondary breakers such as CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, and CVH2_XMM. With five-jaw terminations and four sockets, route conductors carefully to avoid crowding and follow torque specs precisely.
Interrupt rating is determined by the selected main circuit breaker; the system is designed around a 200A rating with a 1200 A bus. This enables proper coordination with upstream devices. Choose a main breaker that matches site demand while observing enclosure and utility requirements to ensure reliable protection and selectivity.
Yes. The 3MM420R12RL is a group metering solution with three-phase in and single-phase out capabilities, making it well-suited for multi-tenant residential and light-commercial facilities. The five-jaw, four-socket configuration supports multiple feeders while maintaining a compact outdoor footprint and straightforward wiring diagrams.
The unit is UL Listed, and it has utility approvals including GA (Georgia Power) and TX (TNMP). These credentials help streamline permitting, enhance field acceptance, and support interconnection requirements for projects in the southeastern United States.
Warranty follows Eaton policy 25-000: one year from installation or 18 months from shipment, whichever occurs first. Additional support includes access to Eaton technical literature, specification sheets, and direct engineering assistance for compatibility with CCV2_X, CVS2_XMM, CV2_XMM, and CVH2_XMM secondary breakers, and for overall metering program planning.