Eaton 3MM512R12 Residential Meter Stack - UL Listed

Three-phase in, single-phase out design streamlines metering for multi-tenant facilities, delivering clear energy attribution and simplified billing across each tenant. The group metering module supports a 125A service with a 120/208V supply, enabling precise load distribution and straightforward regulatory compliance across meters. It is ideal for residential and light commercial properties that require scalable, centralized metering to reduce administrative overhead and field rework. Space efficiency and enclosure flexibility enable faster installations in space-constrained environments and retrofit projects where traditional metering infrastructure is a bottleneck. The indoor/outdoor rating supports year-round operation, while the 55.5 in length by 15.5 in width by 8.5 in height footprint minimizes enclosure needs and optimizes layout. Weighing 68 lb, it remains manageable for standard crews, allowing secure wall mounting or integration with existing enclosures without specialized lifts. Robust power hardware includes an aluminum bus rated at 1200 A with five jaws and five sockets to accommodate main and multiple branch connections. Phase balancing between A and B and the ring security feature enhance connection integrity and fault visibility during commissioning and routine maintenance. The no-bypass design simplifies protection coordination and reduces bypass-related risk, supporting safer, more reliable operation. UL Listed certification underpins electrical safety and market acceptance, ensuring compliance with widely recognized standards for metering equipment. Selectable secondary breakers BR2, BRH2, or BRHH2 provide flexible protection schemes for diverse panel configurations and service entrances. Utility approvals across Entergy markets and other major providers streamline permitting, testing, and commissioning for complex multi-site deployments. Installation efficiency translates into lower lifecycle costs and quicker project turnover when upgrading building metering or expanding capacity. The modular design supports easy retrofits, future expansion, and seamless integration with standard panelboards and building management systems. Overall, the Eaton 3MM512R12 delivers predictable performance, accurate metering, reduced field rework, and long-term energy-management benefits for owners.