Eaton 3MM320R12RL Residential Meter Stack - UL Listed
Part Number: 3MM320R12RL
Quick Summary
Eaton residential meter stack provides modular three-phase metering for group metering in outdoor installations. This solution addresses the common challenges of wiring complexity and space constraints in multi-tenant and commercial sites. It is UL Listed and designed for outdoor use, with utility approvals from GA, TX, NM to ease interconnections. The aluminum bus and 1200 A bus rating support scalable metering, while five jaws and three sockets enable flexible configuration. By consolidating metering into a single, code-compliant enclosure, it reduces field wiring, speeds commissioning, and lowers maintenance costs. This approach also aligns with Eaton’s metering ecosystem, offering reliable compatibility with CCV2_X, CVS2_XMM breakers and standard accessories, which adds business value for utilities and developers.
Product Information
Extended Description
3MM320R12RL Eaton: Eaton's Three-Phase Residential Meter Stack Module, Group Metering Type, 200A, Aluminum Bus, 1200 Ampere, No bypass, Outdoor, Five-jaws , 3 Sockets, Three-phase in, single-phase out, Ringless Security 120/208V
Product Name
Eaton residential meter stack
Catalog Number
3MM320R12RL
UPC
782114786277
Product Length/Depth
50.5 in
Product Height
8.5 in
Product Width
15.5 in
Product Weight
70 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
3
Phase balance
A-B
Security
Ringless
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM320R12RL
Feature → Business Impact → Application: Outdoor enclosure and five-jaw design deliver rugged durability and high capacity, supporting rapid, code-compliant installations in harsh environments and multi-tenant sites. Result: fewer field adjustments, reduced commissioning time, and scalable metering for growing facilities. Application: Outdoor residential and commercial metering stacks where space is at a premium and reliability is non-negotiable. Feature → Business Impact → Application: Aluminum bus with a 1200 A rating enables high-current group metering with lightweight construction and corrosion resistance, improving long-term performance and ease of handling during installation. Application: Large multifamily or campus metering projects seeking durable, low-maintenance hardware. Feature → Business Impact → Application: Three-phase in, single-phase out with five-jaw, three sockets and a ringless security design increases connection density and reduces wiring errors, boosting accuracy and safety in complex installations. Application: Utility interconnections and building services where precise phase balance (A-B) and secure enclosure are critical. Feature → Business Impact → Application: UL Listed certification and utility approvals (GA, TX, NM) streamline permitting and compliance, accelerating project timelines. Application: Projects requiring trusted safety certification and cross-utility interoperability. Feature → Business Impact → Application: Compatibility with secondary breakers CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM supports flexible protection schemes and straightforward upgrades. Application: Retrofit or upgrade programs within existing Eaton metering ecosystems. Additional notes: Dimensions (50.5 in L x 8.5 in H x 15.5 in W) and weight (70 lb) assist space planning and mounting planning for outdoor locations.
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FAQs
The 3MM320R12RL is ideal for outdoor group metering in multifamily buildings, commercial campuses, and other multi-tenant facilities. It supports GA, TX, NM utility approvals, a 200A rating, and a 120/208V configuration, enabling efficient, code-compliant metering in shared-service environments.
It is designed for three-phase in and single-phase out with a 120/208V voltage rating, providing a streamlined path for distributing power to multiple tenants while maintaining accuracy and safety. The five-jaw enclosure and ringless security reduce wiring errors during installation.
Yes, the unit is UL Listed and designed to work within Eaton’s metering ecosystem. It supports compatible secondary breakers such as CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, and CVH2_XMM for flexible protection and straightforward upgrades.
The enclosure measures 50.5 inches in length, 8.5 inches in height, and 15.5 inches in width, with a vehicle-friendly weight of about 70 pounds. These specs help with space planning, mounting, and site preparation for outdoor installations.
Yes. With UL Listing, outdoor-rated enclosure, and utility approvals for GA, TX, NM, the 3MM320R12RL reduces permitting hurdles and accelerates field commissioning, delivering faster project timelines and predictable performance across multiple sites.