Square D EZ Meter-Pak meter centers provide reliable, versatile, and compact multi metering equipment for multi unit residential and commercial construction. The main devices are available as main circuit breakers, main fusible switches, or main lug terminal boxes. The compact footprint makes them easier to handle and install.  Visi-Tite nuts eliminate the need for time-consuming torque readings when connecting devices.  External mounting channels permit immediate installation with no disassembly or adjustment required. EZM main devices are suitable for use as service equipment with required grounding and bonding. This busway center tap main circuit breaker provides 3 phases in, 3 phases out for a 4 wire configuration. It accepts 208Y/120VAC and 240/120VAC delta incoming service from busway feeds. The unit is rated for 600A with the busbar rated for 4000A. It has a short circuit current rating of 100kA. The enclosure is painted steel Type 3R. This EZ Meter-Pak meter center complies with UL standards.