Square D EZ Meter-Pak main devices are available as main circuit breakers, main fusible switches, or main lug terminal boxes. EZM main circuit breaker provides circuit protection and a main disconnect point suitable for service equipment. This main circuit breaker unit supplies three phases in, three phases out with a four wire configuration. It is suitable for underground service feed. It is rated for 208Y/120VAC and 1200A. The compartment comes with a closing plate and three-pole PowerPact P 1200A circuit breaker. The compartment has three horizontal 1200A rated copper busbars. This unit includes an Energy Reduction Maintenance Switch (ERMS). The busbars come with Visi-Tite joint nuts for connections, eliminating the need for torque readings. This main circuit breaker unit is compliant with UL standards and the steel enclosure has a rating of NEMA 3R.