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. EZM Busway tap devices have been designed with space savings in mind so that they not only meet challenging job requirements, but the compact footprint also makes them easier to handle and install. This main unit is a main circuit breaker device with overhead or underground feed, and has a current rating of 400 A. The bus bar has a rating of 1200 A and the unit is available as service equipment for 3 phase, 4 wires applications. The factory installed circuit breaker included is rated for 300 A. Visi-Tite nut eliminates the need for time-consuming torque readings when connecting devices. External mounting channels permits immediate installation with no disassembly or adjustment required.