Eaton 1MM312RC Residential Meter Stack - UL Listed
Part Number: 1MM312RC
Quick Summary
The Eaton residential meter stack provides compact, outdoor metering for multi-residence electrical setups. Installers frequently confront weather exposure, wiring clutter, and limited service access that slow commissioning. UL Listed certification ensures safety and code compliance for outdoor metering equipment. Its outdoor enclosure, 125A amperage rating, and 120/240V capability support reliable service and straightforward integration with common main circuit breakers. Designed for utilities and contractors, this meter stack reduces field labor, improves reliability, and protects customer metering points. With a tall form factor and an 800 A bus rating, it helps site crews manage space constraints while meeting modern demand.
Product Information
Extended Description
1MM312RC Eaton: Eaton residential meter stack, Amperage rating: 125A, Bus rating: 800A, Outdoor, Interrupt rating depends on selected main circuit breaker, Single-phase in/single-phase out, 3 Sockets, Copper, Ring, 120/240 Vac, 4-jaw
Product Name
Eaton residential meter stack
Catalog Number
1MM312RC
UPC
782114989869
Product Length/Depth
7.01 in
Product Height
41.8 in
Product Width
12.26 in
Product Weight
54 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
Utility approvals
ID : Idaho Power OR : Idaho Power WA : Seattle City Light AK : Anchorage Municipal Light & Power NV : NV Energy FL : MEG (Duke Energy, Florida Power, Tampa Electric, Gulf Power, Oklahoma Gas and Electric) IN : MEG (Duke Energy, Florida Power, Tampa Electric, Gulf Power, Oklahoma Gas and Electric) KY : MEG (Duke Energy, Florida Power, Tampa Electric, Gulf Power, Oklahoma Gas and Electric) NC : MEG (Duke Energy, Florida Power, Tampa Electric, Gulf Power, Oklahoma Gas and Electric) OH : MEG (Duke Energy, Florida Power, Tampa Electric, Gulf Power, Oklahoma Gas and Electric) SC : MEG (Duke Energy, Florida Power, Tampa Electric, Gulf Power, Oklahoma Gas and Electric) WA : Puget Sound Energy WA : Tacoma Public Utilities NC : Dominion VA : Dominion
Interrupt rating
Depends on selected main circuit breaker
Enclosure
Outdoor
Bus Rating
800 A
Phase
Single-phase in, single-phase out
Voltage rating
120/240 V
Amperage Rating
125A
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 1MM312RC
The outdoor enclosure provides weather protection, reducing corrosion risk and downtime for exterior metering installations, which translates into lower maintenance costs over the system life. The 125A amperage rating with an 800A bus rating supports typical residential service profiles and headroom for modest load growth, enabling reliable performance in single-family and small multi-dwelling applications. Three sockets and a four-jaw ring deliver secure copper connections, simplifying field wiring and improving service continuity in busy exterior meter pits. Interrupt rating depends on the selected main circuit breaker, which allows you to tailor protection to meet local codes and customer load without over-specifying equipment. The unit’s outdoor rating and durable construction enhance installation reliability, while its dimensions (height, width, depth) support integration into standard exterior enclosures and pedestals. UL Listed certification reinforces safety and code compliance across utilities and contractor environments, supporting faster approvals and reduced project risk. Weighing 54 lb with a footprint of 41.8 in tall by 12.26 in wide and 7.01 in depth, it delivers a balance of strength and installability for space-constrained sites.
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FAQs
The 1MM312RC is designed for outdoor residential use and integrates with standard main circuit breakers. Its 125A amperage rating and 800A bus rating provide suitable headroom for typical single-phase residential services. The unit’s outdoor enclosure supports weather exposure, while the interrupt rating depends on the selected main breaker, requiring coordination with the protection scheme to meet local codes and utility requirements.
Key specs include 125A amperage rating, 800A bus rating, 120/240V voltage, single-phase in and out, 3 sockets, and a 4-jaw ring with copper conductors. The enclosure is outdoor-rated, and the product supports a 3-socket configuration for primary connections. These specifications align with typical residential and light commercial metering needs while enabling straightforward field installation.
Yes. The 1MM312RC carries UL Listed certification, signaling compliance with recognized safety standards for electrical equipment installed in outdoor, residential metering applications. This certification supports regulatory acceptance, safer field operation, and smoother project approvals for utilities and contractors.
Downloads are available from Eaton, including the Residential and Light Commercial Metering Products catalog and the Eaton Specification Sheet for 1MM312RC. Access the materials at the provided URLs to obtain installation guidance, wiring diagrams, and exact dimensional data for proper selection and mounting.
Typical applications include outdoor metering for multifamily properties, townhomes, and other residential developments requiring reliable outdoor power management. Considerations include confirming main breaker compatibility due to the interrupt rating, ensuring adequate space in exterior pedestals, and planning for the 41.8 in height footprint. Utilities in Idaho Power, Puget Sound Energy, and other regions have approved metering configurations that help streamline project approvals and commissioning.