As a rule, wheel pilots and tiller pilots don't have automated clutches - you clutch them manually and then you activate the autopilot. When clutched, the motors won't spin when you turn the wheel/tiller yourself, and if they do, they should not. You have to declutch them to take over manually.
The drives that attach to the rudder stock below deck, so-marketed 'linear drive units', do have electro-magnetic clutches, and these clutches require electrical current to engage. They require more current to engage than they require to stay engaged, and to save power, pypilot accommodates for this with an initial pulse to engage, and limiting the power to the clutch after a predefined short time period. So the clutch is not a motor turning one way to engage, and turning the other way to disengage, if that's what you're thinking.
For hydraulic drives, I don't know much about these, but this might already answer some of your questions.
The drives that attach to the rudder stock below deck, so-marketed 'linear drive units', do have electro-magnetic clutches, and these clutches require electrical current to engage. They require more current to engage than they require to stay engaged, and to save power, pypilot accommodates for this with an initial pulse to engage, and limiting the power to the clutch after a predefined short time period. So the clutch is not a motor turning one way to engage, and turning the other way to disengage, if that's what you're thinking.
For hydraulic drives, I don't know much about these, but this might already answer some of your questions.