Triac - thyristor electron volt-ampere characteristic way into the N1 zone, the P2 zone holes. N1 zone into the electrons and the P1 region through the junction J1 injection hole recombination N1 zone, the same SCR BT137S-600E, into the hole P2 area by the N2 area by injecting electrons into the complex junction J3 P2 region, avalanche hit wear SCR, triac - trigger circuit SCR3 with the surrounding elements common shift trigger circuit SCR BT136S-600E, the principle is omitted here. SCR1, SCR2 selection of packaged thyristor modules (110A / 1000V), SCR3 selection BTl36 SCR T435-600T, namely 600V triac. This circuit is used as an inductive load, should increase R4, C3 RC snubber circuit and varistor RV for overvoltage protection, prevent the load off and on instantly generate high voltage induced damage SCR SCR BT137S- 600E, being fertile Electronics (certified), SCR provided by the Dongguan City, is Wo Electronic Technology Co., Ltd. Dongguan City is Wo Electronic Technology Co., Ltd (www.dgmydz.com) (www.dgmydz.com) Dongguan, Guangdong, FET leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. Wal-e-leadership in the positive with the staff warmly welcome all inquiries negotiations to create a positive fertile electronic better future.