Square D EZ Meter-Pak main devices are available as main circuit breakers, main fusible switches, or main lug terminal boxes. EZM main fusible switchesprovide a main disconnect point suitable for service equipment. This fusible switch supplies one phase in, one phase out with a three wire configuration. It is rated for 120/240VAC and 400A. It is suitable for underground or overhead service feed. The compartment accepts Class T 300VAC fuses (order separately). The compartment has three horizontal 400A rated busbars. The busbars come with Visi-Tite joint nuts for connections, eliminating the need for torque readings. It is compliant with UL standards and the steel enclosure has a rating of NEMA 3R.