Eaton 37MM320R12 Commercial Meter Stack - UL Listed
Part Number: 37MM320R12
Quick Summary
Eaton 37MM320R12 Commercial Meter Stack provides compact, three-phase metering for commercial and light industrial service equipment, delivering reliable power measurement in a single, space-efficient unit. In practice, engineers contend with crowded panels, differing utility requirements, and the need for quick, code-compliant installation that minimizes downtime. UL Listed safety certification, along with Eaton’s broad utility approvals across multiple states, helps procurement meet regulatory mandates without re-engineering existing systems. With 8.75 in depth, 18.25 in width, and 52.63 in height, the 130 lb stack also streamlines installation with lever bypass and ringless security. Designed for three-phase in/out configurations and safety-compliant energy distribution, it supports 208Y/120V service, commercial metering accuracy, and scalable capacity up to 225 A per socket.
Product Information
Extended Description
37MM320R12 Eaton: Eaton's 37MM Three-Phase Commercial Meter Stack Modules, 225A, Aluminum Bus 1200 Ampere, Lever bypass Seven-jaws 3 Socket Three-phase in, three-phase out Factory A-B Phase Balance, Ringless Security , 225 Ampere Socket Ampere, 208Y/120V
Product Name
Eaton commercial meter stack
Catalog Number
37MM320R12
UPC
786849052904
Product Length/Depth
8.75 in
Product Height
52.63 in
Product Width
18.25 in
Product Weight
130 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
Utility approvals
IN : Indiana Michigan Power (IMP) (AEP East) MI : Indiana Michigan Power (IMP) (AEP East) OH : AEP Ohio (AEP East) TN : Appalachian Power (AEP East) VA : Appalachian Power (AEP East) WV : Appalachian Power (AEP East) AL : Alabama Power IL : Ameren MO : Ameren WI : Alliant (IP&L and WP&L) DC : Atlantic City Electric / Delmarva (Connectiv) DE : Atlantic City Electric / Delmarva (Connectiv) MD : Atlantic City Electric / Delmarva (Connectiv) NJ : Atlantic City Electric / Delmarva (Connectiv) MD : Baltimore Gas and Electric TX : CenterPoint Energy (HL&P/Reliant) NY : Central Hudson Gas & Electric (CHG&E) ME : Central Maine Power IL : Commonwealth Edison (ComEd) / CECHA MI : Consumers Energy OH : Dayton Power and Light (DP&L) MI : DTE Energy (Detroit Edison) NM : El Paso Electric TX : El Paso Electric ME : Emera Maine (Bangor Hydro Electric Co./ Maine Public Service Company) OK : Empire District Electric AR : Entergy LA : Entergy MS : Entergy TX : Entergy MD : First Energy (Potomac Edison) VA : First Energy (Potomac Edison) WV : First Energy (Mon Power) NJ : First Energy (Jersey Central Power and Light) OH : First Energy (Ohio Edison, Toledo Edison, The Illuminating Company) PA : First Energy (Allegheny Power, MET ED, Penelec, West Penn Power) GA : Georgia Power KS : Kansas City Power and Light (KCPL) / Westar Energy MO : Kansas City Power and Light (KCPL) / Westar 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) TN : Middle Tennessee EMC TN : Nashville Electric Service NY : Orange & Rockland Utilities PA : PECO Energy NY : PSE&G Long Island NM : Public Service Company of New Mexico (PNM) FL : Tallahassee City Electric CT : United Illuminating (UI) WI : WE Energies / Wisconsin Public Service (WPS) PA : Pennsylvania Power & Light (PPL) SC : South Carolina Electric and Gas (SCE&G) NY : Rochester Gas & Electric (RG&E) CT : Eversource (Connecticut Light and Power Co./Nstar/PSC New Hampshire/Western Mass Electric) MA : Eversource (Connecticut Light and Power Co./Nstar/PSC New Hampshire/Western Mass Electric) NH : Eversource (Connecticut Light and Power Co./Nstar/PSC New Hampshire/Western Mass Electric) CO : Xcel Energy MI : Xcel Energy ND : Xcel Energy NM : Xcel Energy IA : Alliant (IP&L and WP&L) MO : Empire District Electric SD : Xcel Energy TX : Xcel Energy WI : Xcel Energy MT : NorthWestern Energy NE : NorthWestern Energy SD : NorthWestern Energy WY : NorthWestern Energy KY : Louisville Gas & Electric/Kentucky Utilities DC : PEPCO MD : PEPCO IN : Indianapolis Power and Light (IP&L) NC : Dominion VA : Dominion
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 37MM320R12
Feature: Three-phase commercial meter stack with 225 A socket capacity and aluminum bus. Business Impact: Enables space-efficient energy distribution with robust thermal performance and reduced panel footprint, lowering enclosure costs and simplifying serviceability for small to mid-size commercial facilities. Application: Ideal for multi-tenant commercial buildings and light industrial service panels seeking compact, reliable metering solutions. Feature: Lever bypass, seven-jaw sockets, and ringless security. Business Impact: Minimizes outage time during maintenance, enhances tamper resistance, and improves safety for installers and operators. Application: Critical service feeders in distributed metering enclosures and high-occupancy locations where uptime matters. Feature: Factory A-B Phase Balance. Business Impact: Promotes balanced loading across phases, reducing neutral conductor stress and improving overall system efficiency. Application: Large commercial feeders and mixed-load environments requiring stable phase balance. Feature: Defined dimensions and weight (8.75 in depth, 18.25 in width, 52.63 in height, 130 lb). Business Impact: Predictable footprint simplifies panel planning and retrofits, accelerating installation and reducing on-site surprises. Application: New builds and retrofits in crowded electrical rooms where space is at a premium. Feature: UL Listed certification and broad utility approvals. Business Impact: Provides regulatory compliance and acceptance across utility jurisdictions, reducing procurement risk and rework. Application: Nationwide deployments across IN, MI, OH, TN, VA, WV, and other markets, supporting rapid project timelines.
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FAQs
The 37MM320R12 is designed as a modular three-phase meter stack that integrates with Eaton metering systems, leveraging standard three-phase in/out configurations, lever bypass, seven-jaw sockets, and ringless security. Its catalog number and UL Listed certification simplify replacement or expansion within established Eaton enclosures, reducing retrofit risk and installation time while preserving electrical ratings up to 225 A per socket.
Key specs include a 225 A socket rating, 208Y/120V service, aluminum bus construction, and dimensions of 8.75 in depth, 18.25 in width, and 52.63 in height, with a total weight of 130 lb. The unit features three-phase in/out, factory A-B phase balance, and lever bypass with seven-jaw sockets, all UL Listed for safety compliance.
Yes. The product is UL Listed and carries broad utility approvals across numerous states (including IN, MI, OH, TN, VA, WV, among others), enabling faster permit approvals and installation in multi-site deployments. This reduces rework and supports consistent metering practices across facilities and portfolios.
Warranty follows Eaton’s policy 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first. Routine maintenance is typically limited to inspection of terminations and bypass components during standard electrical room procedures; the rugged aluminum bus and protected enclosure design minimize service intervals and downtime.
Applications include multi-tenant commercial buildings, data centers, and light industrial facilities where space is at a premium and precise energy metering is required. The combination of compact dimensions, lever bypass, ringless security, and A-B phase balance supports reliable, code-compliant metering with faster installation and scalable capacity up to 225 A per socket.