Square D by Schneider Electric D323N 100-Amp 240-Volt 3-Pole Fusible Indoor General Duty Safety Switch, 4-wire design with 3 blades and fuse holders and 1 neutral 120/240 Volt AC 100 amperes NEMA type 1 metallic enclosure for indoor use 7.5/15.0 HP 240 Vac single phase (standard/maximum)