Eaton 3MM520R12RLBBUS Residential Meter Stack - UL Listed
Part Number: 3MM520R12RLBBUS
Quick Summary
Eaton 3MM520R12RLBBUS residential meter stack is a modular metering solution designed for multi-meter installations in residential and light commercial settings. Engineers often encounter space constraints and wiring complexity when expanding metering capacity, which can slow projects and jeopardize accuracy. This UL Listed unit supports 120/208V systems with a 200A service and a 1200A bus, while offering five sockets and a fifth jaw at the 9 o'clock position for flexible configurations. With a compact footprint and proven Eaton reliability, it streamlines integration with existing MCBs and improves billing data quality. In practice, it enables scalable metering, faster commissioning, and better regulatory compliance across multi-tenant and small commercial applications.
Product Information
Extended Description
3MM520R12RLBBUS Eaton: Eaton 3MM residential meter stack, Multiple meter, 200A, Al, Bus:1200A, Horn, Out, Depends on MCB, 5-j, Sockets:5, 1-ph in, 1-ph out, A-B, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ringless, Socket:200A, Incline busway meter, 120/208V
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM520R12RLBBUS
UPC
786685010878
Product Length/Depth
13.5 in
Product Height
74.96 in
Product Width
6.87 in
Product Weight
106 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
Catalog Notes
Fifth jaw included at 9oclock position
Type
Multiple metering
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - 3MM520R12RLBBUS
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Multiple metering for separate unit energy data → Business Impact: Enables precise allocation, reduces manual reconciliation, and improves billing accuracy for multi-tenant setups → Application: Ideal for residential buildings or light commercial properties with several service meters. Feature: 200A service with 1200A bus → Business Impact: Supports scalable load distribution and future capacity, lowering future upgrade costs → Application: Useful where future expansion or increased demand is anticipated. Feature: 120/208V operation and 1-ph in/out → Business Impact: Simplifies wiring and installation while maintaining compatibility with common utility feeds → Application: Fits standard electrical distribution schemes in apartments, campuses, and small offices. Feature: Five sockets and a fifth jaw at 9 o'clock → Business Impact: Flexible metering configurations reduce field rework during commissioning → Application: Enhances adaptability for diverse metering layouts. Feature: Ringless design and UL Listed certification → Business Impact: Improves safety, reliability, and regulatory compliance while expediting approval processes → Application: Suitable for utility-connected metering in regulated markets. Insight: The 3MM stack is designed with industry-standard dimensions (74.96 in height, 6.87 in width, 13.5 in depth) and a weight of 106 lb, aiding predictability in installation planning and field manpower requirements. Compatibility: Works with Eaton MCBs and compatible busway systems to minimize integration risk during retrofit projects. Industry context: For property developers and facility managers, the 3MM520R12RLBBUS supports precise energy accounting, reduces audit findings, and accelerates tenant onboarding through clearer meter visibility.
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FAQs
Plan for a vertical installation in a weather-protected, accessible location. Note the unit’s dimensions (74.96 in tall, 6.87 in wide, 13.5 in deep) and weight (106 lb) to ensure hoisting and support arrangements are adequate. The fifth jaw at 9 o'clock simplifies reconfiguration, and the 120/208V, 1-ph in/out wiring needs proper conductor sizing per NEC.
Key specs include Type: Multiple metering, 200A main service, 1200A bus, 120/208V operation, Sockets: 5, 1-ph in, 1-ph out, Catalog Number 3MM520R12RLBBUS, UPC 786685010878, and a UL Listed certification. Dimensions are 13.5 in depth, 74.96 in height, and 6.87 in width with a 106 lb weight.
Yes. The unit is designed for 1-ph in/out metering with multiple metering capability, making it appropriate for applications requiring individual energy measurement per phase or per tenant within a single installation, while maintaining a straightforward wiring scheme.
The meter stack carries UL Listed certification, confirming safety compliance for electrical equipment. It is covered by Eaton’s warranty policy, which provides one year from installation or eighteen months from shipment, whichever occurs first, ensuring coverage during initial field use and handling potential manufacturing defects.
The design includes a fifth jaw and ringless configuration to ease field adjustments and metering layout changes. It integrates with Eaton MCBs and compatible busway meters, reducing retrofit risk, accelerating commissioning, and improving reliability of energy data across multi-tenant or small commercial projects.