Square D by Schneider Electric QO Plug-On Neutral 150 Amp Main Breaker 42-Space 42-Circuit Indoor Load Center with Cover Engineered for a quick Plug-on Neutral breaker connection on every circuit, fewer connections, faster installation, no pigtails frees up gutter space Includes a factory-installed indoor cover Accommodates plug-on secondary surge arrestor (sold separately) Overhead/underground feed simply by rotating the device before installing Single phase; Rated 120/240 VAC and 22,000 AIR short circuit current rating