Abstract: A circuit arrangement for electrically isolated transmission of an electrical signal with an optocoupler comprising a converter circuit which converts the electrical signal into a pulse width-modulated signal and delivers this signal to an optocoupler; a logic circuit which generates a completion signal when the conversion into the pulse width-modulated signal has been completely finished; an evaluation circuit connected to the output of the optocoupler which recognizes the pulse width-modulated signal as valid only when the completion signal has been received by it. Conversion into the pulse width-modulated signal is performed after the appearance of the electrical signal to be converted only after a delay time (tv) has elapsed. The power supply of the circuit arrangement is realized on the input side of the optocoupler by means of a power supply circuit, which is powered by the electrical signal to be converted.