CURRENT DETECTOR

PURPOSE:To make the construction of an electric current detector simple and small and make it possible to install it easily to each branch switch by actuating external signal issuing devices by means of the outputs of a plurality of differential amplifiers for individual electric current detection values. CONSTITUTION:A load current that is flowing through a load circuit NL is input to a condenser C1 through a current transformer CT and an all wave rectifier SR. The output of the condenser is input to the series circuit consisting of a Zener diode ZD and a potentiometer PM and a constant voltage circuit VSC. Furthermore, the output of the constant voltage circuit VSC is input through resistors R1-R5 of a potential divider to differential amplifiers AMP1-AMP5 that are provided respectively for each of detected current values, and, by the increase in the voltage at the condenser C1 due to increase in the load current of the differential amplifiers AMP1-AMP5 are succesively reversed and at the same time lamps LED1-LED5 are successively lighted through transistors Tr1- Tr4 and a resistor R12. With this setup the state of load current flow can be confirmed easily from a distant place.