This is a heavy-duty, non-fusible safety switch / disconnect manufactured by Schneider Electric under the Square D line. It’s rated for 60 A and up to 600 V AC or DC (three-pole, three-wire), making it suitable for demanding industrial or commercial power applications. It features a stainless-steel NEMA 4X enclosure, a quick-make/quick-break operating mechanism, and a viewing window so you can visually confirm switch position. It’s designed for surface mounting with lug terminals, offering robust isolation for circuits when maintenance or emergency shutdown is needed. Because it’s non-fusible, overcurrent protection must be handled upstream (e.g. via circuit breakers or fuses).