The Nova 300 M-A comes with a continuous duty submersible asynchronous motor. Stator fitted in an airtight stainless steel casing. Rotor mounted on overdimensioned, greased-for-life ball bearings. Built-in thermal and current overload protection and a capacitor permanently on in the single-phase version. For the protection of the three-phase motor it is advisable to use a suitable overload protection complying with the regulations in force.