If SCR remains on A pole or pole disconnect G T2 pole position pointer immediately return ∞, then the SCR trigger current is too large or damaged. The method may further measurements Figure 2, for a one-way thyristor SCR BTA216, closing the switch K, lights should be lit, disconnect the lamp is still interest K off, or else explain SCR damage. For triac, closing the switch K, lights should be lit, disconnect K, lights should be quenched. Then reverse battery SCR, repeat the above steps, the result should be the same SCR BTA412Y, only explanation is good. Otherwise, it means that the device has been damaged. SCR SCR unidirectional difference is that when G pole triac trigger pulse polarity change, the conduction direction to change with the change of polarity controllable Silicon BTA140, enabling control of AC loads. And by the way thyristor is triggered only after the wizard from the anode to the cathode through unilateral, so there is a single bidirectional thyristor points. Commonly used in electronic production SCR, MCR-100 has a one-way, etc., there is two-way, etc. TLC336. SCR SCR _ BTA312_ are fertile Electronics Dongguan City is provided by Wal-Electronic Technology Co., Ltd .. Dongguan City is Wal-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 the electronics are fertile and you hand into the brilliant, for a better future! You can also access (www.dgmydz.com/supply_details_49354865.html), for more information about the company.