Eaton 3MM420R12 Residential Meter Stack - UL Listed

Three-phase in, single-phase out configuration is built into the meter stack, enabling efficient grouping of loads across a building while ending every feeder on a single, organized phase path. This reduces neutral and phase balancing risks and simplifies protection coordination for developers and property managers. In practice, it suits mid- to large-scale residential complexes where staggered metering and utility settlement matter for monthly billing precision. With a 200 A main and a 1200 A bus rating, the unit delivers ample headroom for growth without replacing the enclosure. The higher bus rating supports multiple subfeed breakers and future load increases, helping engineers avoid retrofit costs. This is ideal for new-builds or major renovations in multifamily housing where metering capacity must scale with occupancy. Constructed with an aluminum bus and an outdoor enclosure, the meter stack withstands exposure to weather while delivering robust electrical performance. Five-jaw and four-socket configurations provide modularity for feeder connections, easing wiring management and serviceability. The enclosure design supports surface or pedestal mounting in exterior spaces common to apartment complexes, mixed-use developments, and shared meter rooms. Ring security features and secondary breaker compatibility (CCV2_X/CCVH2_X/ CVS2_XMM/ CV2_XMM/ CVH2_XMM) enhance safety, while ensuring long-term reliability and simplified maintenance. From an installation perspective, rugged outdoor-ready design and standardized dimensions streamline field mounting and commissioning, and Eaton’s warranty policy provides a clear maintenance horizon. This combination translates into lower lifecycle costs and predictable ROI in multi-tenant developments.