Eaton 3MM420RRLB1 Residential Meter Stack - UL Listed
Part Number: 3MM420RRLB1
Quick Summary
The Eaton 3MM420RRLB1 residential meter stack enables multi-metering for outdoor electrical installations in residential and light commercial settings. Facilities often struggle with space, wiring complexity, and coordinating metering across multiple tenants; this enclosure consolidates meters and simplifies service entry. UL Listed safety certification provides confidence in field deployments, while its rugged outdoor enclosure aligns with standard power management practices. Designed for power distribution reliability, this meter stack complements commercial and multifamily architectures while supporting scalable metering strategies. This combination reduces installation risk, accelerates commissioning, and delivers accurate billing through true multi-point measurement. Its durable aluminum bus and ringless sockets support easy, code-compliant integration with existing Eaton suite and third-party breakers.
Product Information
Extended Description
3MM420RRLB1 Eaton: Eaton 3MM residential meter stack, Multiple metering, 200A, Al, Bus:800A, Horn bypass, Outdoor, Depends on MCB, five-jaw, Sockets:4, 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
3MM420RRLB1
UPC
782116007493
Product Length/Depth
13.5 in
Product Height
64.5 in
Product Width
7.01 in
Product Weight
80 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
Catalog Notes
Fifth jaw included at 9oclock position
Type
Multiple metering
Feature: Multiple metering capability enables centralized management of several circuits or tenants in a single enclosure. Business Impact: Reduces footprint, lowers wiring complexity, and improves billing accuracy across units. Application: Ideal for multifamily properties and commercial buildings where separate metering is required without multiple separate cabinets. The result is shorter installation times and clearer energy accounting. Feature: Outdoor-rated enclosure designed for external mounting. Business Impact: Eliminates the need for indoor space, increases safety with weatherproof design, and minimizes maintenance in harsh environments. Application: Outdoor power management and distribution in campuses, industrial yards, and exterior electrical rooms. Feature: Five-jaw configuration with fifth jaw included at 9 o’clock position. Business Impact: Flexible metering topology supports diverse electrical schemes and future expansion without cabinet changes. Application: Customizable metering layouts for evolving tenant loads and building retrofits. Feature: 120/208Vac compatibility with 200A service and 800A bus capability. Business Impact: Broad compatibility with common commercial electrical systems, enabling seamless integration with existing distribution gear and breakers. Application: Building service entrances, outdoor feeders, and shared-energy projects. Feature: UL Listed and robust warranty alignment. Business Impact: Demonstrates compliance with safety standards, reduces project risk, and provides clear post-sale support terms for procurement teams. Application: Service catalogs, project bids, and OEM-aligned maintenance planning. Insight: With a 64.5 in height and 13.5 in depth footprint, the 3MM420RRLB1 balances capacity with install practicality, supporting scalable metering strategies in modern power management and distribution programs.
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FAQs
Outdoor installation requires a compliant mounting surface with appropriate weatherproof seals and secure enclosure anchoring. Ensure mounting location provides clear access for service cables, wiring from four sockets, and space for the five-jaw configuration. Verify ambient temperature and clearance meet the cabinet’s installation guidelines to maintain UL Listed safety and reliable long-term operation.
The unit supports multiple metering with 3-phase in and 1-phase out, using four sockets to manage simultaneous circuits. It accommodates a 200A socket and a bus rated for 800A, enabling flexible topology for residential and light commercial installations. This configuration simplifies tenant metering while keeping main service protection centralized.
Yes, the Eaton 3MM420RRLB1 is UL Listed, confirming compliance with recognized safety standards. It is designed for 120/208Vac operation, supporting common commercial power networks and ensuring safe deployment in outdoor environments across diverse buildings.
Best suited for multifamily buildings, commercial campuses, and outdoor utility rooms where multiple meters must be consolidated. Its outdoor-rated enclosure, 200A service capability, and 800A bus make it ideal for scalable metering strategies, tenant segregation, and simplified integration with existing Eaton or third-party breakers in power distribution plans.
Expected benefits include reduced installation time due to fewer enclosures, improved energy billing accuracy from centralized metering, and lower lifecycle costs through a durable outdoor cabinet that minimizes indoor space requirements. The fifth-jaw option provides configuration flexibility, reducing retrofit costs during tenant changes or load growth.