Eaton 3MM320RRLB Residential Meter Stack - UL Listed
Part Number: 3MM320RRLB
Quick Summary
Eaton 3MM320RRLB residential meter stack is a compact, outdoor-ready multi-meter enclosure designed for residential and light commercial feeders. It addresses space constraints, wiring complexity, and scalability challenges by providing a modular, ready-to-wire metering solution that accommodates future expansion. With UL Listed certification and outdoor-ready durability, this unit supports code-compliant safety and reliable service in harsh environments. By enabling flexible metering configurations and straightforward installation, it helps engineers shorten project timelines and lower total installed costs while delivering accurate energy data for informed decision-making.
Product Information
Extended Description
3MM320RRLB Eaton: Eaton 3MM residential meter stack, Multiple metering, 200A, Al, Bus:800A, Horn bypass, Outdoor, Depends on selected MCB, 5-j, Sockets:3, 3-ph in, 1-ph out, A-B, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ringless, Socket:200A, 120/208Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM320RRLB
UPC
786849052256
Product Length/Depth
13.5 in
Product Height
52.35 in
Product Width
7.01 in
Product Weight
6.55 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
Multiple metering
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM320RRLB
Feature → Business Impact → Application: The multi-metering design enables 200A service with an 800A bus, supporting multiple tenants or feeders in a single enclosure, improving energy visibility and reducing enclosure footprint in tight spaces. This translates to faster commissioning and reduced space planning costs for new builds or retrofits in residential and light commercial projects. Feature → Business Impact → Application: Outdoor-rated construction allows exterior installations without indoor drainage or climate control, minimizing interior work and enabling rapid deployment in outdoor utility rooms or building exteriors. This supports maintenance-free operation in variable climates and improves service reliability for critical metering points in multi-tenant facilities. Feature → Business Impact → Application: 5-j sockets, 3-ph in and 1-ph out, and ringless sockets provide straightforward wiring and scalable metering paths, reducing installation time and error rates during panel tie-ins in apartment complexes and small campuses. Feature → Business Impact → Application: Horn bypass and configurable MCB dependency offer service continuity during maintenance and flexible protection schemes, lowering downtime and optimizing fault isolation in commercial installations. Feature → Business Impact → Application: UL Listed certification and 120/208Vac operation ensure compliance with electrical codes and standard utility interfaces, mitigating risk and easing procurement for regulated projects. The lightweight, compact form factor (13.5 in depth, 7.01 in wide, 52.35 in tall) supports flexible placement in constrained spaces and simplifies site logistics for contractors and engineers.
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FAQs
The Eaton 3MM320RRLB is designed for residential and light commercial metering installations. It supports multiple metering in a single outdoor-rated enclosure, with a 200A main and an 800A bus, making it ideal for multifamily buildings, small campuses, or shared utility spaces where space is at a premium.
The meter stack uses 5-j sockets and is dependent on the selected MCB, enabling flexible protection schemes. It is designed for ringless sockets and a 200A socket option, which simplifies wiring and accelerates installation while maintaining code-compliant protection in residential and light commercial projects.
With multiple metering points in one enclosure, operators gain clearer energy visibility and load balancing capabilities. The horn bypass feature supports maintenance without interrupting service, while its outdoor-ready design minimizes exposure to indoor environmental risks, improving reliability for critical feeders.
The 3MM320RRLB is UL Listed, validating compliance with recognized safety standards for electrical equipment used in residential and outdoor applications. This certification supports code compliance, safer installations, and smoother procurement with utilities and inspectors.
By consolidating metering in a single outdoor enclosure, projects benefit from reduced enclosure footprint, faster installation, and easier future expansion. The unit’s modularity and UL certification help minimize downtime and risk, delivering longer-term savings through improved energy monitoring and lower maintenance costs.