Way thyristor detection resistor R * 1Ω multimeter selected block SCR T405-600T, with red, black and two pen were measured between any two pins to identify positive and negative resistance until the reading of tens of ohms a pair of primers SCR foot, then the black pen pin for the control electrode G SCR 2P4M, red pen pin cathode K, another empty pin anode A. The black pen then have to determine the anode A, the red pen is still attached to a cathode K. Multimeter pointer should not move at this time. By shorting the anode A short moment and the gate G, this time multimeter power block pointer should be deflected to the right, the resistance reading of about 10 ohms. A black pen pick anode, cathode K, take the red pen, multimeter pointer deflection, indicating that the way thyristor has breakdown. Triac thyristor structure principle and application of ordinary (VS) essentially belongs to the DC control devices. To control the AC load, must be two parallel thyristor reverse polarity, so that each SCR control a half-wave, for which required two separate trigger circuit, use is not convenient enough. Triac is evolved on the basis of ordinary thyristor SCR C106G, it can not only replace two anti-parallel thyristors polarity, but only a trigger circuit, is the ideal communication switching devices. Its English name that triac TRIAC AC switch means. SCR C106D_ are fertile Electronics (certified) _ SCR Dongguan City is provided by Wal-Electronic Technology Co., Ltd. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) is Dongguan, FET leader, 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-electronics leader in the positive with the staff warmly welcome all inquiries negotiations to create a positive future Wal-electron better. You can also access (www.dgmydz.com/supply_details_51897430.html), for more information about the company.