Eaton 3MM320R12RLBC Residential Meter Stack - UL Listed
Part Number: 3MM320R12RLBC
Quick Summary
Eaton 3MM320R12RLBC is a residential meter stack that enables multiple metering for outdoor electrical distributions. For engineers and contractors, the challenge is combining meter visibility, accessibility, and code compliance in a compact footprint. UL Listed safety certification underpins reliable outdoor performance and reduces risk during field deployment. This solution supports 200A service, 120/208V systems, and 3‑ph/1‑ph metering configurations while integrating with existing MCB choices, driving faster installation and lower total installed cost. In practice, it delivers space efficiency for multi-tenant buildings and a scalable path for future expansion, aligning with procurement needs and maintenance planning.
Product Information
Extended Description
3MM320R12RLBC Eaton: Eaton 3MM residential meter stack, Multiple metering, 200A, Cu, Bus:1200A, Horn bypass, Outdoor, Depends on selected MCB, 5-j, Sockets:3, 3-ph in, 1-ph out, B-C, CCV2_X, CCVH2_X, CVS2_XMM, CV2_XMM, CVH2_XMM, Ringless, Socket:200A, 120/208V
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM320R12RLBC
UPC
786685513119
Product Length/Depth
13.5 in
Product Height
52.35 in
Product Width
7.01 in
Product Weight
86 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 - 3MM320R12RLBC
The Eaton 3MM320R12RLBC supports multiple metering in a single outdoor enclosure, enabling 200A service with 120/208V capability. By consolidating meters, it reduces wiring complexity and minimizes spatial footprint, accelerating installation and simplifying future expansion for load growth in multi-tenant residential or light commercial sites. The design features three sockets with 3‑phase in and 1‑phase out, while maintaining clear current path segmentation for safety and reliability. Material durability and UL Listed safety certifications support dependable field performance under varying weather conditions. This enclosure also aligns with common MCB selections, streamlining procurement and project planning. Outdoor readiness is a defining advantage for modern power distribution, with rugged construction and clear labeling to support rapid commissioning by electrical contractors. The fifth jaw at the 9 o’clock position simplifies changes in phase arrangement without expensive rework, and the ringless design minimizes potential contact resistance. These features translate into quicker field setup and lower commissioning costs while maintaining safety and measurement accuracy. Current capacity and conductor flexibility matter for long-term reliability. A Cu bus rated to 1200A provides headroom for future circuit additions and load shifts, while the 5‑jaw configuration supports organized metering for growing facilities. The unit’s 200A service is a common choice for residential and light commercial designs, enabling safer, more efficient distribution with less disruptive enclosure changes as demand evolves. Installation reliability and compatibility: Sockets are configured for three meters with 3‑ph in and 1‑ph out, accommodating mixed loading and diverse tenant requirements. The ringless design minimizes points of failure and improves service continuity, while horn bypass offers a straightforward bypass path for metering in special cases. Together these features shorten commissioning time and reduce ongoing maintenance costs. Warranty and compliance: Eaton provides a one-year warranty from installation or eighteen months from shipment, with UL Listed certification supporting electrical safety and code compliance in outdoor environments. The product’s rugged design, compatibility with standard MCBs, and documented installation notes help procurement teams achieve consistent lead times and predictable project delivery.
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FAQs
Plan for outdoor mounting with a clear access path and weather protection. The unit weighs 86 lb, includes a fifth jaw at 9 o’clock, and supports three meters with 3‑ph in and 1‑ph out. Ensure correct MCB compatibility and follow UL Listed installation guidelines to maintain safety and metering accuracy during commissioning.
Key specs include 200A service, Cu bus rated to 1200A, and 120/208V operation. The three-socket, 3‑ph in / 1‑ph out configuration supports multiple metering while preserving phase integrity. Ringless metering and horn bypass enhance maintenance efficiency and reliability, reducing downtime during changes or upgrades.
Yes. The 3MM320R12RLBC is designed for outdoor, multi-meter installations common in multi-tenant residential buildings and light commercial facilities. Its 200A service and 120/208V compatibility, combined with multiple metering sockets and a compact footprint, support scalable tenant load management without bulky enclosures.
The product is UL Listed, confirming compliance with recognized safety standards for electrical equipment used in outdoor and distribution applications. UL listing reduces risk during installation and operation, supports code compliance, and provides a reliable basis for procurement and commissioning.
Warranty is Eaton Selling Policy 25-000, one year from installation or eighteen months from shipment, whichever occurs first. This coverage, combined with durable outdoor construction and predictable compatibility with standard MCBs, supports long-term reliability, reducing unexpected maintenance and contributing to a favorable total cost of ownership.