The S04 series utilizes an analog control for the adjustment of power on resistive loads. Due to the unit's varistor, protection from overvoltage is provided.
The device features a frequency range of 40 up to 70 Hz, and current capacity of 35 up to 125 A. It has a supply voltage of 8 up to 30 V, and 0 up to 10 V analog input voltage. Also, it is manufactured in compliance with EN60947-4-3, and EN60950/VDE0805 standards.