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1. Turn-on interval DIN 46120 (figure l) The triac connected to T turns on with the rising edge on the start input S and off when the set time has elapsed, and does this independently of the length of the start pulse. The effect of noise pulses on the start input is minimized by the dead times. 2. Dropout delay to DIN 46120 (figure 2) The triac turns on with the rising edge on S. The falling edge on S triggers the timing. The triac remains turned on until the set time has expired.