Triac - thyristor found a plastic measuring method TO-220 package Triac BCR3AM (3A / 600V) SCR T405-800T, first determine the electrode: red, black bars at the pipe between any two electrodes measurement When measured as 0.578V That Ugt1 when it is determined not in contact with a great bar table T2. Triac - thyristor measurements when the red plastic rod short T2 and floating electrode show 0.546V SCR BT134W-600E, the voltage is less than Ugt1 = 0.578V, so black bars are connected to T1, the other pole was G. Trigger Performance discrimination: the red bar then T2, then the black bars T1, display overflow (pipe off). SCR BT137S-600E, SCR, is provided by Wal-electronic Dongguan City is fertile Electronic Technology Co., Dongguan City is Wo Electronic Technology Co., Ltd (www.dgmydz.com) (www.dgmydz.com) strong, credible, FET and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead positive fertile electronic and you hand into the brilliant, for a better future!