No, the MOSFET is ONLY in the Solid State Switch.If you're using a MOSFET as a series pass source-follower, don't forget you need at least 6V Vgs to turn it fully on.
Some people use a charge-pump voltage doubling rectifier alongside the power one to develop a higher voltage to drive the gate.
It has only two states; on or off, both of which are lines to its own PCB.