Thanks for the feedback.
That leads to some other Questions:
1 ) Should we use Zero Switching or Instant on (we asume Instant on)
2) The Response time you mentioned: There are several informations : operational frequency rate 45-65Hz, Response time pick-up <= 1 ms, control pulse width >= 0.5ms, Response time dropout <=1/2 cycle.
Is this O.K? at which frequency can we drive this relay?