Eaton 3MM212R12RLC Residential Meter Stack - UL Listed
Part Number: 3MM212R12RLC
Quick Summary
Eaton 3MM residential meter stack is a modular metering solution designed for multi-tenant electrical systems, delivering accurate submetering with compact outdoor housing. Engineers often struggle with space constraints, wiring complexity, and outdoor durability when deploying shared-meter configurations. UL Listed certification confirms safety and compliance, while the rugged outdoor design supports 120/208 Vac systems and scalable 125 A metering per unit. The product features 5-jaw sockets and two sockets per enclosure, simplifying field assembly and future expansion. For contractors and owners, this combination enables faster installation, safer connections, and predictable maintenance costs, backed by Eaton's warranty and service commitments.
Product Information
Extended Description
3MM212R12RLC Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Copper, Bus:1200A, No bypass, Outdoor, Depends on selected MCB, 5-jaw, Sockets:2, 3-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ringless, Socket:125A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM212R12RLC
UPC
786685512860
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
56 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 - 3MM212R12RLC
Feature: Multi-metering capability enables per-tenant energy accountability, reducing bill disputes and enabling separate pricing. Business Impact: Improves revenue certainty for property owners while simplifying tenant energy management. Application: Ideal for multi-tenant residential and light commercial buildings seeking precise submetering without complex retrofits. Feature: 125 A per meter with a 1200 A bus rating supports scalable distribution as load grows. Business Impact: Allows gradual capacity expansion without replacing the entire stack, lowering capital expenditure. Application: Suitable for outdoor meter stacks feeding multiple circuits and modules. Feature: Exterior outdoor-rated enclosure with copper conductors and ringless, no-bypass design enhances safety. Business Impact: Reduces tamper risk and maintenance costs while improving reliability in harsh environments. Application: Outdoor installations in exposed environments where weather resistance matters. Feature: 3-phase in, single-phase out and 120/208 Vac compatibility simplify configuration. Business Impact: Streamlines wiring topology, accelerates commissioning, and minimizes field errors. Application: Submetering for mixed-phase electrical systems in multi-dwelling developments. Feature: UL Listed certification plus Eaton warranty coverage provides compliance confidence. Business Impact: Supports audit readiness and reduces risk, while offering post-sale support. Application: Regulated installations and projects requiring documented safety certification and service terms.
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FAQs
Begin with a suitable outdoor-rated enclosure and mount the meter stack on a stable support. Connect the 5-jaw sockets per the manufacturer’s wiring diagram, ensure 120/208 VAC supply compatibility, and route conductors to the two sockets. Verify there is no bypass and that all connections are torque-checked to Eaton specifications to minimize loss and tampering risk.
The unit supports 125 A per meter with a 1200 A bus rating, two sockets, and 3-phase in, single-phase out configuration. It operates on 120/208 VAC and is UL Listed. The design includes five-jaw sockets and copper conductors, enabling reliable, scalable multi-metering for outdoor applications.
Yes, the meter stack is UL Listed, indicating it has been evaluated for safety and compliance with applicable electrical standards. This reduces regulatory risk, supports inspections, and aids in achieving project approvals, particularly for outdoor metering installations in multi-tenant or light-commercial environments.
Best suited for outdoor multi-metering in multi-tenant residences and light commercial sites. The unit’s 125 A per meter capacity, 120/208 VAC compatibility, and three-phase in with single-phase out support efficient submetering schemes, space optimization, and straightforward expansion as building loads evolve.
Eaton provides a warranty per policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This is complemented by standard Eaton service commitments, ensuring maintenance support, replacement parts availability, and technical assistance throughout the product lifecycle.