Square D EZ Meter Pak devices are the industry choice, providing better solutions to meet more multi unit construction needs than any other line in the industry. The EZM Busway tap devices have been designed with space saving in mind so that they not only meet challenging job requirements, but the compact footprint also makes them easier to handle and install. Circuit breaker, fusible switch, and terminal box mains from 400 to 1600 A maximum. Suitable for use as service equipment. This center main unit has a main lug, 400 A, 3 PH, 4 wire, and NEMA 3R enclosure. It comes with an aluminum busbar.