... three-phase ac sequence in several according to each phase flow within the period of phase, micro controller program runs ... low malfunction, service, etc. In stead of touch, thyristor switch, common compound switch, widely used in low voltage reactive power claims.2 ... 20%, use life 100,000 times.2. Switch 2000V switch power voltage: acuities than 2W3. Switch pressure resistance than 0.1V: 20S, ...