[ricard]

It's not one of those solenoids where there is a low-impedence pull-in coil and a high-impedence hold coil, with some form of switching between them? I.e. so the pull-in coil is energized until the plunger is home, and then the hold coil is energized, with less current drawn and power dissipated, as it is still strong enough to hold the plunger in place but not to pull it in.