This AC WORKS brand protective adapter [S630CB620] is a heavy-duty adapter cable. This 1-foot cord is a NEMA 6-30P to NEMA 6-15/20R. The NEMA 6-30P is a 30 Amp, 3-prong, commercial HVAC plug. The NEMA 6-15/20R is a 15/20 Amp, T-blade, 250 Volt, female connector. The cable is an STW, 10/3, anti-cold weather cable staying flexible in extreme temperatures. The cord is super durable and typically used with construction and industrial equipment. Included with your purchase is a 5-year limited warranty.