Eaton 37MM220R12 Commercial Meter Stack - UL Listed
Part Number: 37MM220R12
Quick Summary
The Eaton 37MM220R12 commercial meter stack delivers compact, field-ready three-phase metering for commercial and light-industrial power distribution. Professionals often struggle with limited space, wiring complexity, and the need to meet strict interconnection requirements during installation. This unit is UL Listed and supported by broad utility approvals across IMP, AEP East, FirstEnergy, Xcel Energy, and others to simplify site permitting and commissioning. Rated for 208Y/120V service with 225 A socket amperage and a 1200 A overall capacity, it uses aluminum bus and a lever bypass for quick maintenance. By combining robust construction with secure ringless design and straightforward installation, it delivers reliability, reduces field labor, and supports scalable, compliant power management.
Product Information
Extended Description
37MM220R12 Eaton: Eaton's 37MM Three-Phase Commercial Meter Stack Modules, 225A, Aluminum Bus 1200 Ampere, Lever bypass Seven-jaws 2 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
37MM220R12
UPC
786849052898
Product Length/Depth
8.75 in
Product Height
52.63 in
Product Width
18.25 in
Product Weight
98 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 IA : Alliant (IP&L and WP&L) 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) ME : Central Maine Power IL : Commonwealth Edison (ComEd) / CECHA MI : Consumers Energy OH : Dayton Power and Light (DP&L) ME : Emera Maine (Bangor Hydro Electric Co./ Maine Public Service Company) MI : DTE Energy (Detroit Edison) 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 MN : Xcel Energy ND : Xcel Energy NM : Xcel Energy 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 - 37MM220R12
Feature: Compact, three-phase meter stack with elevated height, width, and depth specifications is designed to fit standard electrical rooms while retaining full metering capability. Business Impact: Space-efficient footprints enable retrofit projects and multi-site deployments without sacrificing metering reliability. Application: Ideal for commercial buildings, retail centers, and light-industrial facilities seeking streamlined metering footprints. Feature: 225 A socket amperage with a 1200 A overall capacity and aluminum bus provides robust current handling with reduced weight. Business Impact: Enables high-current service for mid-size facilities while minimizing enclosure stress and installation effort. Application: Feeder sections and service entrances in offices and campuses where reliable three-phase metering is required. Feature: Lever bypass and seven-jaws two-socket in/out configuration simplifies maintenance and allows quick isolation of sections during servicing. Business Impact: Minimizes downtime and supports safer field work with clear fault isolation. Application: Routine metering upgrades and emergency maintenance in busy commercial sites. Feature: Ringless security and secure interconnection design reduce arc fault exposure and simplify inspection, improving safety and compliance. Business Impact: Enhances personnel safety and reduces commissioning risk during site acceptance testing. Application: Data centers, medical campuses, and multi-tenant facilities with strict safety standards. Feature: UL Listed certification and broad utility approvals (IMP, AEP East, FirstEnergy, Xcel Energy, and others) streamline interconnection. Business Impact: Lowers interconnection risk, shortens project timelines, and accelerates approval cycles. Application: Multi-site deployments across utility service territories for nationwide rollouts. Feature: Durable construction with aluminum bus, three-phase in/out capability, and clear product dimensions (52.63 in H Ă— 18.25 in W Ă— 8.75 in D; 98 lb). Business Impact: Predictable handling, easier space planning, and fewer site surprises during installation. Application: Facility upgrades, campus deployments, and new-build commercial power systems.
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FAQs
The 37MM220R12 is designed for standard commercial metering enclosures and leverages a straightforward seven-jaws two-socket in/out layout. Field installation benefits include simplified wiring paths, clear labeling, and coordinated phase balance. To minimize commissioning time, verify enclosure clearance, mount to a rigid backplane, and connect to 208Y/120V circuits per Eaton installation guidelines and local code requirements.
The stack supports 208Y/120V service with a 225 A socket amperage and a 1200 A total capacity, using an aluminum bus to handle mid-size commercial loads. This configuration is suitable for commercial and light-industrial facilities requiring reliable three-phase metering with secure interconnections and straightforward fault isolation, meeting typical interconnection standards for North American commercial power distribution.
Yes. With UL Listing and broad utility approvals across multiple regions (IMP, AEP East, FirstEnergy, Xcel Energy, and others), the 37MM220R12 is well suited for multi-site deployments. Its standardized dimensions, consistent wiring topology, and known performance characteristics streamline procurement, installation, and commissioning across campus-style facilities, reducing site-specific engineering time.
The unit carries UL Listed certification, and Eaton provides extensive utility approvals to support interconnection across many service territories, including Indiana Michigan Power, AEP Ohio, Appalachian Power, FirstEnergy, and others. This combination helps simplify regulatory compliance, reduces permit delays, and accelerates the path to energization for new or retrofitted sites.
Maintenance considerations center on routine inspection of the lever bypass, sockets, and ringless enclosure integrity. The aluminum bus and solid mechanical construction reduce wear, while the modular design supports quicker single-point maintenance. ROI benefits come from faster installation, reduced labor costs, lower risk of field faults, and smoother utility interconnection processes across multiple sites.