Type TC and TDT double-throw safety switches are designed for applications with two sources of power where safety, high performance and continuity of service are essential. Double-throw switches are available in 30-1200 amps, 600 Vac, 250 Vdc maximum in fusible and non-fusible construction, and in NEMA Type 1 (indoor) and Type 3R (outdoor), and NEMA Type 4X (stainless steel) enclosures.