Eaton 1MM320RC Residential Meter Stack - UL Listed
Part Number: 1MM320RC
Quick Summary
The Eaton residential meter stack enables multi-metering in single-family and multi-tenant service panels. It addresses the pain of scattered metering by consolidating multiple meters into one code-compliant enclosure, reducing footprint and wiring complexity. UL Listed and housed in a NEMA 3R enclosure, it delivers weather-resistant reliability, while built-in four-jaw connections support fast, secure terminations. Designed for residential and light-commercial metering programs, the unit helps shorten installation cycles and improve accuracy in energy billing. Its compatibility with standard main circuit breakers and selected secondary breakers simplifies procurement and stocking for electrical distributors. Engineers value the combination of copper bus, 120/240V operation, and a robust enclosure that withstands field conditions.
Product Information
Extended Description
1MM320RC Eaton: Eaton resi meter stack, Multiple metering, 200A, Copper, Bus: 800A, No bypass, NEMA 3R, Depends on selected main circuit breaker, Four-jaw, 3, Single-phase in/single-phase out, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ring, 120/240V
Product Name
Eaton residential meter stack
Catalog Number
1MM320RC
UPC
782114989890
Product Length/Depth
13.5 in
Product Height
52.35 in
Product Width
7.01 in
Product Weight
63 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
Amperage Rating
125A
Bus material
Copper
Bus Rating
800 A
Bypass
None
Number of jaws
Four-jaw
Number of sockets
3
Phase
Single-phase in, single-phase out
Security
Ringless
Voltage rating
120/240 V
Utility approvals
ID : Idaho Power OR : Idaho Power WA : Seattle City Light AK : Anchorage Municipal Light & Power NV : NV Energy WA : Puget Sound Energy WA : Tacoma Public Utilities NC : Dominion VA : Dominion
Enclosure
NEMA 3R
Interrupt rating
Depends on selected main circuit breaker
Secondary circuit breaker
CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 1MM320RC
Multi-metering capability converges several measurement points into a single enclosure for streamlined service panels. This layout reduces panel footprint and wiring complexity, translating to faster field installs and clearer energy measurement for tenants or residents. In practical terms, contractors can deploy a single, centralized metering point in multi-tenant buildings, easing future upgrades and simplifying maintenance. Feature: Copper bus with an 800 A bus rating and 125 A metering supports high-load, low-loss conduction, enabling accurate energy data during peak demand and reducing voltage drop concerns for critical loads. Application: suitable for utility-grade metering within residential stacks and light commercial projects. Feature: Four-jaw, three-socket design with ringless operation ensures multiple meters connect securely while preserving service reliability; compatibility with CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM enables flexible secondary protection. Application: simplifies retrofits and new installs. Feature: ENclosure is NEMA 3R and UL Listed, offering indoor/outdoor performance and established compliance, which minimizes field corrective work and accelerates commissioning. Application: outdoor meter stacks in protected environments. Feature: No bypass and robust construction improve safety and reliability in live-service panels, while standardized dimensions fit common footprints and expedite procurement. Application: reduces stocking variance for electrical distributors and maintains consistency across projects.
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FAQs
The 1MM320RC provides 125 A metering with a four-jaw, three-socket layout that accommodates multiple meters in a single enclosure. This consolidates measurement, reduces wiring complexity, and speeds up commissioning for multi-tenant and single-family installations.
Yes, the 1MM320RC is UL Listed and housed in a NEMA 3R enclosure, which offers reliable protection for indoor and outdoor applications subject to weather exposure.
The unit is compatible with secondary breakers CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, and CVH2_XMM, enabling flexible protection schemes for multi-meter configurations.
Ideal for residential and light-commercial metering, including multi-tenant dwellings, the stack supports centralized metering, easier bill-back, and streamlined procurement for distributors.
Benefits include a ringless design, no bypass, and a copper bus with high current capacity, which reduces wiring complexity and simplifies field terminations, leading to faster commissioning and fewer field adjustments.