"Thermally protected" means that if the pump overheats, it will automatically shut down. (You're going to run MBM, right?)
I don't believe that your pump is piston driven, I just meant it as an example. Your pump is direct driven, meaning that the motor shaft drives the impeller directly. Your impeller is probably sealed in some type of housing attached to the end of the electric motor. If you look closely, you can probably see the motor shaft.
A mag driven pump doesn't have a motor shaft, it moves a shaft by magnetic induction. (the advantage of which is electric isolation from the fluid). The shaft is completely encased in its own housing, which is surrounded by electric coils.
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