Convenient stepless electronic speed controller for 3~ fans, which can be controlled via phase control by reducing the voltage. State-of-the-art technology through the use of microcontrollers. Analogue control 0..10 V through on-site signal or electronic temperature controller EKW 6.3, parallel control of several control devices possible, permitted. Distribution of the ventilation output to several fan groups. With overload protection and full motor protection by monitoring the thermal contacts of the motor. Meets EMC requirements Class B, no shielded cable between device and motor required.