Abstract: A circuit arrangement in an electrical device which contains a load which can be supplied with a direct-current voltage of lesser quality and electronic components which can be supplied with a direct-current voltage of greater quality, especially in a timing relay for supplying the device with energy from an alternating-current network by means of a transformer or voltage divider connectable with the alternating-current network and a subsequently connected rectifier arrangement. The rectifier arrangement connected after the transformer has an output at which there are connected a first supply branch and via a reverse current barrier a second supply branch containing smoothing means and a voltage stabilizer. The load which is to be supplied with the direct-current voltage of lesser quality is connected at the first supply branch and the electronic components to be supplied with the direct-current voltage of greater quality are connected at the second supply branch.

Abstract: A reference value transmitter for a phase clipping or cutting control for starting a squirrel cage-asynchronous motor, comprising a start-up regulator for the upward regulation of a reference value transmitter- output voltage from a start-up voltage value which is constant during a primary start-up phase to a rated voltage value with a predetermined build-up speed during a terminal start-up phase. The start-up regulator is constructed for triggering the terminal start-up phase by means of a command signal and for the start-up regulator there is provided a command transmitter which contains a current measuring device for the motor current and a threshold value or limit indicator connected with the current measuring device for generating the command signal.

Abstract: A circuit arrangement for superposing or impressing starting conditions at an electrical operating means primary simulator composed of RC-elements wherein the primary simulator network is charged by a charging current functionally dependent upon an operating current to a charging voltage representative of the heating-up or thermal behavior of the operating means and the charging voltage appears at a low-ohmic or low-impedance output of a charging state-storage device for controlling an electronic operating means-protection relay.

Abstract: A phase breakdown- and null current detector, especially in or for an electronic motor protection relay with current-dependent response or triggering, which is controlled by detection alternating-current voltages proportional to current values in the motor outer conductors and contains an electrical motor simulator representative of the thermal or heating behavior of the motor due to the charging operation of a capacitive storage. The motor simulator can be adjusted by a controlled switching device to different time-constants corresponding to the operating conditions of the motor.