A controllable semiconductor device in the circuit to achieve circuit continuity off a switching device

Semiconductor non-contact switch is a semiconductor device by means of a controllable circuit continuity to achieve a switching circuit continuity appliances. It was after the 1950s developed a switch, transistor or thyristor can be air circuit breaker by the transistor power constraints, mostly using thyristor and its control circuit. Semiconductor non-contact switch's advantages are: current can be made larger, high resistance against pressure value, the control gate power power transformers, turn-on and Circuit breaker is short, long working life, good environmental adaptability, high work efficiency. For example, there are contacts contactors, operating frequency is higher than 36 times / h or more, very difficult, but the semiconductor-type non-contact switch, the operating frequency of up to tens of thousands of times per hour to hundreds of thousands of times.