Triac - Detection DIP4 pin type ZC TRIAC optocouplers use a multimeter RXl profile determination triac electrode method, and also check the ability to trigger. 1. determination T2 very G pole and pole near the thyristor T1, T2 very far away. So SCR BT136S-600E, G-T1 between the positive and negative resistance is very small triac - works Kt16P single-phase thyristor voltage regulator / power adjustment trigger positive plate due posed BG1 and BG2 feedback, so once the thyristor, even if the current control electrode G is gone, the SCR will still be able to maintain on state SCR, since the trigger signal is triggered only play the role, not a shutdown function, so this SCR can not be turned off. SCR T405-800T, 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.