Up to what level of current can be used at the switch section of a photorelay? Also, for a pulsed current or AC current, what happens?

A current to be used should be at a level of current below the value specified with “ON-State Current I_ON” for the absolute maximum rating in the technical documents. In addition, since derating by temperature Ta is applied to I_ON, the level may become equal to or lower than the above value. Care should be taken. Even for a pulsed current and AC current, a current must be used with a value not exceeding the value for I_ON with respect to both the current peak value and the current effective value.