Eaton 3MM312R12RLB Residential Meter Stack - UL Listed
Part Number: 3MM312R12RLB
Quick Summary
The Eaton 3MM residential meter stack is a modular metering solution for outdoor three-phase in, single-phase out service. For engineers and procurement teams, outdoor installations often struggle with space constraints, weather exposure, and wiring complexity. UL Listed safety certification validates reliability in field deployments, while the rugged outdoor design supports harsh environments. This meter stack is designed to optimize footprint, simplify wiring, and accelerate commissioning. By aligning with Eaton MCB options and scalable bus configurations, it delivers measurable business value through faster installs and reduced maintenance in residential and light commercial metering projects.
Product Information
Extended Description
3MM312R12RLB Eaton: Eaton 3MM residential meter stack, MM, 125A, Al, Bus:1200A, Horn bypass, Outdoor, Depends on selected MCB, 5-jaw, Sockets:3, Three-phase in, single-phase out, A-B, BR2_, BRH2_, BRHH2_, BRX2, Ringless, Socket:125A, 120/208 Vac
Product Name
Eaton 3MM residential meter stack
Catalog Number
3MM312R12RLB
UPC
782114786307
Product Length/Depth
12.26 in
Product Height
41.8 in
Product Width
7.01 in
Product Weight
58 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 - 3MM312R12RLB
Feature: Outdoor-rated modular meter stack with 125A socket and a 1200A bus. Business Impact: Enables a compact, scalable metering solution that supports multi-tenant or mixed-load applications while minimizing space requirements. Application: Suitable for outdoor installations where three-phase in, single-phase out metering is required. The design reduces wiring complexity and accelerates field deployment. Long-tail keywords: outdoor metering, modular meter stack, three-phase to single-phase metering.Feature: UL Listed certification. Business Impact: Ensures safety compliance and simplifies inspections, reducing project risk and rework. Application: Ideal for regulatory-constrained environments and utility-approved installations. Long-tail keywords: UL Listed metering equipment, safety-compliant metering, electrical enclosures compliance.Feature: Fifth jaw included at 9 o’clock position. Business Impact: Improves wiring flexibility and eliminates the need for additional accessories, speeding up installation. Application: Facilitates precise metering configurations with existing MCBs. Long-tail keywords: fifth jaw configuration, metering accessories, wiring flexibility.Feature: Sockets: 3, Three-phase in, single-phase out, 120/208 Vac. Business Impact: Provides versatile metering topology for diverse load profiles and lightweight commercial setups. Application: Multi-tenant and mixed-load facilities benefit from rapid, reliable metering topology. Long-tail keywords: three-phase in single-phase out, 120/208 Vac metering, versatile metering topology.Feature: Outdoor enclosure with durable construction. Business Impact: Enhances uptime in harsh environments, reducing maintenance frequency and service calls. Application: Outdoor residential and light commercial metering where weather exposure is a concern. Long-tail keywords: rugged outdoor metering enclosure, outdoor reliability, maintenance reduction.Feature: Warranty and support details (one year from installation or 18 months from shipment). Business Impact: Clear, implementable protection that lowers lifecycle risk and supports budgeting. Application: Project handover and long-term asset management for utility and building owners. Long-tail keywords: product warranty, field support, lifecycle protection.
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FAQs
The 3MM312R12RLB is designed for outdoor use with a 125A socket and a 1200A bus. It supports three-phase in and single-phase out configurations and includes a fifth jaw at the 9 o’clock position for wiring versatility. Ensure the enclosure is rated for outdoor service and verify compatibility with the selected MCBs to achieve the intended protection and load profile.
Key specs include 125A socket capability, 120/208 VAC operation, and a 1200A bus. The unit supports three-phase in and a single-phase out arrangement. It is UL Listed, which confirms safety compliance for field installations. Verify socket ratings, phase configuration, and voltage to match your system design and metering needs.
Yes. Designed for outdoor service, the 3MM312R12RLB accommodates 125A sockets, 120/208 VAC, and three-phase in with single-phase out, making it suitable for outdoor residential and light commercial metering. Its rugged construction and UL Listed certification support reliable operation in varied environmental conditions and regulatory contexts.
The product is UL Listed, validating compliance with recognized safety standards for electrical equipment. This certification matters for inspections, utility approvals, and regulatory compliance in outdoor metering installations, reducing the risk of non-compliance and associated project delays.
The unit carries Eaton’s warranty policy: one year from installation or eighteen months from shipment, whichever occurs first. This provides clarity on coverage during initial operation and supports budgeting for maintenance, spare parts, and future replacements as part of total cost of ownership considerations.