Eaton 3MM512R12C Meter Stack - UL Listed
Part Number: 3MM512R12C
Quick Summary
Eaton 3MM512R12C is a residential meter stack for multi-point metering in outdoor service enclosures. Engineers often struggle with space constraints, wiring complexity, and the challenge of safe, code-compliant installations. UL Listed safety certification, outdoor enclosure suitability, and a rugged five-jaw socket design help reduce field risk. For utilities and installers, this stack supports scalable metering with straightforward installation and proven reliability. The product’s 125A service, copper bus, and 120/208Vac capability support common U.S. electrical distribution scenarios. This combination enables building operators to consolidate metering hardware while maintaining visibility into energy use across tenants. Its outdoor-ready design reduces service calls and supports compliant deployments in multi-dwelling and mixed-use facilities.
Product Information
Extended Description
3MM512R12C Eaton: Eaton 3MM residential meter stack, Multiple metering, 125A, Copper, Bus:1200A, No bypass, Outdoor, Depends on selected MCB, Five-jaw, Sockets:5, Three-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ring, Socket:125A, 120/208Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM512R12C
UPC
786685512907
Product Length/Depth
12.26 in
Product Height
57.5 in
Product Width
7.01 in
Product Weight
68 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 - 3MM512R12C
Feature → Multiple metering capability (125A service, copper bus rated to 1200A) enables simultaneous monitoring across circuits. Business impact → Reduces hardware footprint, lowers total installed cost, and accelerates energy accounting. Application → Ideal for multi-tenant dwellings and mixed-use buildings needing centralized metering in one outdoor enclosure. Feature → Outdoor enclosure design with rugged materials and outdoor-ready mounting. Business impact → Improves weather resilience, extending service life and lowering maintenance. Application → Suitable for exterior meter stacks at commercial properties, campuses, and residential complexes. Feature → Five-jaw sockets and sockets: Five-Jaw connectors simplify termination and reduce mis-wiring risk. Business impact → Speeds up commissioning and improves first-pass electrical integrity. Application → Field installation where rapid, reliable connections are critical. Feature → Three-phase in, single-phase out configuration. Business impact → Supports common service arrangements, enabling easier backfed metering and distribution. Application → Residential, mixed-use, and light-commercial feeders that require phased input with single-phase outputs. Feature → UL Listed certification and Eaton warranty terms (one year from installation; eighteen months from shipment). Business impact → Ensures safety compliance and predictable after-sales support. Application → Projects with strict code adherence and facilities that require dependable warranty coverage.
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FAQs
The Eaton 3MM512R12C is designed for outdoor residential metering with a 125A service and copper bus rated up to 1200A, supporting integration with standard service disconnects and distribution equipment. Its three-phase in, single-phase out configuration simplifies interfacing with common panelboards and meter mains, reducing the need for adapters or custom cabling. Ensure the enclosure footprint matches your site and that the wiring schemes align with local codes for safe, code-compliant installations.
Key specifications include a 125A service rating, copper bus with a 1200A bus rating, and input/output wiring for 120/208Vac systems. The unit supports three-phase in and single-phase out, with five-jaw sockets to simplify terminations. This combination enables accurate metering across multiple circuits while maintaining compatibility with typical residential and light commercial distributions.
Yes. The 3MM512R12C is explicitly designed for outdoor use as a residential meter stack with multiple metering capability. Its outdoor-rated enclosure, UL Listed certification, and five-jaw socket design support reliable performance in exposed environments while enabling centralized metering across tenants and units, helping streamline billing and energy management.
The warranty follows Eaton’s policy: one year from installation of the product or eighteen months from the date of shipment, whichever occurs first. This provides a clear post-installation support window. For ongoing support and service, consult Eaton's customer policies and the product datasheet to confirm current terms and any region-specific variations.
When installing the 3MM512R12C, plan for the five-jaw sockets to simplify multi-circuit terminations and verify conductor sizes match the copper bus rating of up to 1200A. Ensure correct three-phase in and single-phase out wiring, proper enclosure mounting for outdoor exposure, and adherence to local electrical codes. Pre-fabrication of feeders and clear labeling will accelerate commissioning and reduce field errors.