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, and residential and commercial branches are available in ring or ringless type. EZ Meter-Pak meter centers have accessories and spare parts for field replacements and design flexibility. Extensions provide additional space between the main device and the branch unit where needed to meet local utility requirements. This 12 inch bus extension section has a 1200A rated bus and is for a three phase system. It is rated for indoor and outdoor use.