the difference is that it doesn't work with a current through a coil creating an magnetic field that's opparating switch contacts
an solit state is a relay that does this pure with semiconductors
so no moving parts that can wear out no swittshing contacts that can get dirty and corode and can get burned in they can create sparks with all problems from that
other big diference is the price
solid state relais that can switch some power equipment (5 KW or more) are extreemly exspensive
but in aplication like a gas store or supply station you need to have them
Robert-Jan
the difference is that it doesn't work with a current through a coil creating an magnetic field that's opparating switch contacts
an solit state is a relay that does this pure with semiconductors
so no moving parts that can wear out no swittshing contacts that can get dirty and corode and can get burned in they can create sparks with all problems from that
you mention "pure with semiconductors" oh can we make high frequency pwm with it.
and in the normal mechanical relay there is a reverse current i thing here there isn't is this prob ..,am i right