Abstract: A submersible motor unit comprises an electrical drive motor, an electrical control means for setting the rotary speed and/or the torque of the motor, a common heat-conducting housing for the motor and the control means as well as a connection cable electrically connected to the control means wherein this means is provided on the end side of the motor distant to the pump. In particular for an improved disposal, repair and cooling of the submersible motor unit the electrical control means is formed as a cartridge-like constructional unit which can be inserted into the common housing and which can be electrically plug connected to the drive motor, and the housing of the control means connected to the unshielded connection cable bears with its outer circumferential surface on the inner circumferential surface of the common housing.