To increase or decrease the voltage, in order to powers electrical and electronic equipments. With a galvanic isolation between input and output. They can operate as a battery charger: the charging voltage is adjustable by external potentiometer. Input is protected against polarity reversal, with EMI filter, by fuses. Output is protected against short-circuit, overload and overvoltage. Output power 195W max., may be up to 3 converters in parallel to increase the available power.