How to determine the rating of Solid State Relay?

[Davek0974]

It is actually the opposite. Phase angle or "random firing SSRs" chop the sine wave and creates electronic noise at the leading edge of each half sine wave. For European installations, CE regulations restrict noise, and custom noise filters may be needed. "Zero crossing" control means that each thyristor turns ON exactly at the zero mark of a sine wave. When the control signal is received, the thyristor will turn ON at the next zero mark. When the control signal is removed, the thyristor will wait until the next zero mark, and then it will turn OFF. Zero crossing, when done correctly, is very noise free.

My apologies, it was indeed zero-crossing that I meant to say, although the two to me at least go hand in hand as the phase angle is zero when switched