Square D by Schneider Electric QO Plug-On Neutral 100 Amp Main Breaker 24-Space 24-Circuit Outdoor Load Center 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 rainproof 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