Purchase our Gate Turn Off Thyristors today. Gate Turn Off (GTO) Thyristors are fully controllable switches which can be turned on and off by their third lead, the GATE lead. Darrah offers GTOs ranging from 600 amps to 4000 amps, and ranging from 2500 volts to 4500 volts. Not only do we have a wide vast of quality Gate Turn Off Thyristors but we also have the best pricing. Shop our amazing selection of affordable Gate Turn Off Thyristors today!