Zero Trigger KC08 SCR TRIAC switch can process the moment the supply voltage is zero trigger. Thus, the load transient inrush current and radio frequency interference minimum, the service life of SCR can be improved. The circuit can be used for temperature control thermostat, single or three phase motors and electrical non-contact switch, AC non-contact switch, communication devices such as light shining in the trigger used for retail. Since the students inside the circuit DC power supply, can be directly connected to AC mains voltage. The trigger circuit with zero voltage, output current and other characteristics. Electrical parameters: Supply voltage: a. External DC voltage (12-16) V. b. DC supply voltage from the students: (12 – 14) Vo supply current: = l2mA. Zero detect the maximum peak input current: 8mA. Output pulse: a. Pulse amplitude: 13V. b. Maximum output capacity: 30ma (within 400µs pulse width) can be expanded. c. Output back pressure: BVceo = l8V (test conditions: Ie = 100µA). Input control voltage: "l" level or "0" level. Zero detect the maximum peak input current: 8mA.