Eaton 37MM420R12CAC Commercial Meter Stack - UL Listed
Part Number: 37MM420R12CAC
Quick Summary
Eaton commercial meter stack is a compact, scalable metering module designed for three-phase commercial power distribution. Engineers often struggle with space constraints and the need to consolidate multiple meters into a single, maintainable enclosure; this meter stack minimizes footprint while simplifying ongoing service. UL Listed safety certification underpins field reliability, with the unit’s copper 1200 A bus, 225 A rating, and lever bypass supporting code-compliant installations. Designed for 208Y/120V systems, it provides a clear path to faster installations, easier maintenance, and lower total cost of ownership for mid-sized commercial facilities. In addition to its core metering function, the stack aligns with Eaton’s metering product ecosystem for seamless compatibility and extended service life.
Product Information
Extended Description
37MM420R12CAC Eaton: 37MM-Three-Phase Commercial Meter Stack Modules, EHD3_ , CC3_X, CVS3_X, CV3_X, CVH3_X secondary breaker, 225A socket, 208Y/120V, Ringless, Copper 1200A bus, Lever bypass, Seven-jaws, 4 sockets, A-C phase balance
Product Name
Eaton commercial meter stack
Catalog Number
37MM420R12CAC
UPC
786685708447
Product Length/Depth
67 in
Product Height
10 in
Product Width
20 in
Product Weight
80 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
Amperage Rating
225 A
Bypass
Lever
Bus ampicity
1200 A
Cover
Ringless
Number of meter socket
1
Phase in or out
Three-phase in, three-phase out
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 37MM420R12CAC
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: The Eaton commercial meter stack provides three-phase metering in a single enclosure, enabling space-efficient power distribution layouts and reducing wiring complexity on site, which translates to faster installation and fewer field errors in commercial or light industrial facilities. This consolidation lowers labor costs and improves accuracy of energy measurement across phases, supporting robust utility billing and load management. Application: office campuses, retail centers, and small to mid-size industrial facilities seeking efficient metering with straightforward commissioning. Feature → Business Impact → Application: With a 225 A amperage rating and 208Y/120V capability, the unit supports typical commercial feeders while maintaining headroom for growth and future load increases, enhancing long-term scalability and reliability. Application: new builds and retrofit projects requiring dependable, future-ready metering. Feature → Business Impact → Application: The copper 1200 A bus provides low resistance, reducing voltage drop and improving overall system efficiency, which translates to measurable energy savings and improved voltage uniformity during peak demand. Application: high-density power distribution where voltage balance is critical. Feature → Business Impact → Application: Ringless cover and lever bypass simplify both aesthetics and maintenance; ringless design reduces enclosure corrosion risk and the bypass offers fast isolation during service, minimizing downtime. Application: routine maintenance and emergency shutdown scenarios. Feature → Business Impact → Application: Seven-jaws and four sockets configuration supports flexible metering topology, enabling tailored layouts for multi-tenant or mixed-load environments while preserving compliance with utility standards. Application: modular metering for shared facilities. Feature → Business Impact → Application: The unit’s compact length (67 in), width (20 in), and height (10 in) make it suitable for installations with limited wall depth and space, improving retrofit viability and containerized or cage-mounted deployments. Application: constrained spaces in retrofits and new commercial builds. Feature → Business Impact → Application: UL Listed certification and Eaton warranty policy provide risk mitigation and long-term support, reducing total cost of ownership by ensuring safety compliance and predictable service terms. Application: regulated environments and procurement projects requiring documented safety credentials.
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FAQs
Plan for a 67 in L x 20 in W x 10 in H footprint with room for service access. Ensure 208Y/120V three-phase in/out wiring, allowance for lever bypass operation, and that the enclosure remains ringless to maintain the intended aesthetics and protection. The unit ships with a 1 meter socket and a copper 1200 A bus for reliable performance.
Amperage rating is 225 A, bus ampacity 1200 A, three-phase in/out, 1 meter socket, 67 in L, 10 in H, 20 in W, weight 80 lb, and operating at 208Y/120V. Backed by UL Listed safety certification and lever bypass for quick isolation during maintenance.
Yes. It is designed to integrate with Eaton metering families, providing a compatible 225 A main capacity, copper bus assembly, ringless cover, and lever bypass for streamlined upgrades and expansions in commercial power distribution.
Download the Residential and Light Commercial Metering Products catalog (Volume 1 Tab 4), the Eaton Specification Sheet for 37MM420R12CAC, and the Selling Policy 25-000 for distribution and control products and services to support procurement and installation decisions.
Warranty is Eaton’s standard policy: one year from installation or 18 months from shipment, whichever occurs first. This, combined with UL Listed safety certification, underpins reliable performance and predictable support during the product’s service life.