Thyristor (SCR) pin discrimination (1) Polarity identification: ① range multimeter or appropriated R × 10 × 100 stalls ② anode - cathode forward resistance in more than a few hundred K Ω, reverse resistance ∞. ③ anode - forward resistance between the gate more than a few hundred K Ω. ④ gate - cathode resistor between positive about SCR 2P4M within tens Ω range, generally reverse resistance than the forward resistance, resistance in the range of several hundred Ω. Triac structure principle and application of typical applications zero trigger AC solid state relays (AC-SSR) internal circuitry. Includes input circuit, optocouplers, zero trigger circuit, switching circuit (including bidirectional thyristor), the protection circuit (RC absorption network). When coupled with the input signal VI (usually high), and AC load power supply voltage through zero when the SCR C106G, Triac is triggered thyristor, the load power is on. Solid state relay has a drive power of small, non-contact, low noise, anti-jamming, pull, release time is short, long life, can be compatible with TTL\CMOS circuit can replace the traditional electromagnetic relay SCR BTA225, are fertile Electronics (certified), SCR provided by Dongguan City is fertile Electronic Technology Co., 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.