Eaton 3MM312RC Residential Meter Stack - UL Listed
Part Number: 3MM312RC
Quick Summary
The Eaton 3MM312RC residential meter stack is a compact, scalable metering solution for outdoor installations in multi-tenant and light commercial buildings. This design helps engineers simplify wiring layouts and reduce field downtime by consolidating metering sockets in a rugged, outdoor-rated assembly. It supports 125A service with 120/208 Vac operation and a copper bus rated at 800A, providing reliable current handling in busy distribution corridors. UL Listed, the stack offers straightforward compatibility with common MCBs and clear labeling to speed commissioning. By standardizing on a single metering module, procurement gains supply chain predictability and installers reduce on-site complexity. The result is safer, more economical metering with faster project realization and accelerated ROI for building owners.
Product Information
Extended Description
3MM312RC Eaton: Eaton 3MM residential meter stack, MM, 125A, 120/208 Vac, Copper, Bus:800A, No bypass, Outdoor, Depends on selected MCB, Five-jaw, Sockets:3, Three-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ring, Socket:125A,
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM312RC
UPC
782114990728
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
57 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 - 3MM312RC
Outdoor, outdoor-rated residential meter stack design enables reliable performance in harsh environments, while delivering a smaller footprint for retrofit projects. Feature → Business Impact → Application: The 125A service, 120/208 Vac compatibility and copper 800A bus enable robust load handling and low resistance paths, reducing voltage drop and heat buildup in crowded pull boxes; application includes multi-tenant residential and light commercial metering installations. Feature → Business Impact → Application: Three sockets with five-jaw connections and three-phase in, single-phase out support flexible metering schemes; this simplifies utility billing and supports dynamic MCB configurations for future expansion without major remodels. Feature → Business Impact → Application: No bypass design reduces leakage paths and improves safety while the outdoor enclosure lowers corrosion risk and extends service life in exterior environments. Feature → Business Impact → Application: Clear labeling, modular metering components, and standardized bus arrangement shorten installation time and improve commissioning accuracy across sites. Feature → Business Impact → Application: Compact dimensions (12.26 in depth, 41.8 in height, 7.01 in width) and a 57 lb weight balance installation logistics, enable easier site handling and reduced freight costs. Feature → Business Impact → Application: UL Listed certification provides confidence for compliance audits and reduces risk during inspections, supporting faster tie-in with building management systems and utility interconnections.
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FAQs
Yes. The 3MM312RC is designed for outdoor installation with a 125A service rating and 120/208 VAC operation. It uses a copper bus rated up to 800A and three sockets arranged for three-phase in, single-phase out, enabling straightforward connection to common outdoor metering enclosures. Ensure proper mounting, weatherproof sealing, and adherence to local utility and NEC guidelines during deployment.
Key specifications include 125A service, 120/208 VAC operation, copper bus rated at 800A, five-jaw sockets, and three sockets. The unit supports three-phase input and single-phase output, with socket compatibility at 125A. Wiring should align with selected MCBs, and it’s important to verify proper phase rotation and labeling to ensure accurate metering and safe termination.
Yes. The outdoor-rated construction, 125A service capacity, and multiple-meter configuration make it well suited for multifamily metering. Its modular, three-phase-in/one-phase-out capability supports scalable metering across units, while the 12.26 in depth, 41.8 in height, and 7.01 in width help it fit within common exterior enclosures without excessive footprint.
The 3MM312RC is UL Listed, providing a recognized safety certification for residential and light commercial metering assemblies. This certification supports compliance with many building codes and utility interconnection requirements, helping streamline approvals and inspections for outdoor metering installations.
The product carries Eaton’s warranty policy, offering one year from installation or eighteen months from shipment, whichever occurs first. For ongoing reliability, ensure regular visual inspections for enclosure integrity, confirm MCB selections remain appropriate as system loads change, and coordinate with Eaton for any field service guidance or replacement parts when needed.