Triac - Golden Rule isolated triac switch between MT1 and MT2 join RC snubber circuit. If high dICOM / dt can cause problems SCR BT134W-600E, adding a few mH in series with the load inductance. Another solution, using Hi-Com triac. Triac - product identification for one-way SCR, Patch SCR closing switch K, lights should be lit, disconnect K lamp still quench otherwise explain SCR damage. For triac, closing the switch K, lights should shine SCR, disconnect K, lights should not be quenched. Then reverse battery, repeat the above steps, the result should be the same, only explanation is good. Otherwise, it means that the device has been damaged SCR T435-800T, 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.