The Square D D323NRB is a 100 Amp, 240 Volt, 3-pole, 4-wire general-duty fusible safety switch housed in a rainproof NEMA 3R outdoor enclosure. Manufactured by Schneider Electric, this single-throw disconnect switch is designed for residential and commercial applications to provide overcurrent and short-circuit protection for loads like air conditioning units, lighting, and appliances. It includes a factory-installed solid neutral assembly and features a quick-make, quick-break manual handle mechanism.