Eaton 37MM420R12 Commercial Meter Stack - 225A UL Listed
Part Number: 37MM420R12
Quick Summary
The Eaton 37MM420R12 Commercial Meter Stack provides compact, three‑phase metering for commercial service entrances. This stack is designed to simplify installations where space and wiring complexity previously limited scalability. UL Listed certification ensures safety and compliance with established electrical standards, supporting reliable metering in busy facilities. The unit’s three‑phase in/out configuration, combined with factory A‑B phase balance, enhances measurement accuracy and load distribution. It also features a lever bypass for maintenance without service interruption and supports 208Y/120V systems. By pairing this meter stack with Eaton’s metering catalogs, engineers streamline qualification, procurement, and field installation for scalable, compliant power management.
Product Information
Extended Description
37MM420R12 Eaton: Eaton's 37MM Three-Phase Commercial Meter Stack Modules, 225A, Aluminum Bus 1200 Ampere, Lever bypass Seven-jaws 4 Socket Three-phase in, three-phase out, Factory A-B Phase Balance, Ringless Security , 225 Ampere , Socket Ampere 208Y/120V
Product Name
Eaton 35MM commercial meter stack
Catalog Number
37MM420R12
UPC
786849052911
Product Length/Depth
8.75 in
Product Height
66.63 in
Product Width
18.25 in
Product Weight
200 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
Commercial Meter Stack
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 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 OH : Dayton Power and Light (DP&L) MI : DTE Energy (Detroit Edison) ME : Emera Maine (Bangor Hydro Electric Co./ Maine Public Service Company) MD : First Energy (Potomac Edison) VA : First Energy (Potomac Edison) WV : First Energy (Mon Power) 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 - 37MM420R12
Feature: Three‑phase commercial meter stack with a 225A service rating and 1200A aluminum bus. Business impact: Enables scalable metering for mid‑size commercial loads while maintaining a compact footprint and lower installation costs. Application: Suitable for office complexes, retail centers, and light industrial facilities where space and wiring complexity would otherwise constrain metering.Feature: Lever bypass and seven‑jaw four‑socket configuration for easy maintenance. Business impact: Reduces downtime during maintenance and testing, improving uptime metrics. Application: Critical for facilities with ongoing energy monitoring and frequent metering checks.Feature: Factory A‑B phase balance. Business impact: Improves load balancing, reduces neutral currents, and enhances measurement accuracy across the service. Application: Utilities and building owners seeking precise demand metering and balanced feeders.Feature: Ringless security design. Business impact: Enhances tamper resistance and simplifies on-site verification. Application: Metering in shared service environments with stringent security requirements.Feature: 208Y/120V readiness and broad utility approvals. Business impact: Facilitates utility acceptance and faster connection across multiple regions. Application: New builds and retrofit projects requiring proven utility compatibility.Feature: Comprehensive Eaton documentation availability. Business impact: Accelerates installation and commissioning using official datasheets. Application: Engineers rely on datasheets for correct wiring, catalog references, and field guidelines.
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FAQs
The 37MM420R12 is designed for commercial service entrances and supports 208Y/120V three-phase systems. It features three-phase in/out connections and a 225A service rating with a 1200A aluminum bus, enabling scalable metering for office, retail, and light industrial facilities. Ensure proper bus bar alignment and available space in the switchgear enclosure for straightforward integration.
Key specs include a 225A service rating, 208Y/120V availability, aluminum bus rated for 1200A, seven-jaw bypass with four sockets, and a factory A‑B phase balance feature to improve load distribution and measurement accuracy. UL Listed certification confirms compliance with safety standards.
Yes. The unit is designed to align with multiple utility approvals (e.g., Indiana Michigan Power, First Energy, AEP East properties) and is suitable for commercial metering in states served by those utilities. This approvals footprint helps streamline connection and acceptance during project commissioning.
The 37MM420R12 carries UL Listed certification, confirming conformance to recognized safety standards for electrical equipment used in commercial metering. This supports compliance with national electrical codes and eases procurement with utility and contractor partners.
Warranty terms follow Eaton Selling Policy 25-000: one year from the date of installation or eighteen months from shipment, whichever occurs first. For field support, refer to the Eaton catalogs and datasheets included with the product to ensure correct installation and ongoing maintenance.