acharbeck:
as i know with MOSFET relay, there is no zero crossing. this is just for TRIAC relay
i am asking to make sure before order the MOSFET relay.
there are two aspects of zero crossing if you use a triac for phase cutting. pulse the triac some time after zero crossing and then the triac self turns off AC on next zero crossing. to know when to pulse the triac, you need an additional zero crossing detector circuit.
if you want to use the component as a relay then a triac which is made to work as a relay and not turn off the line on zero crossing works the same way as a MOSFET