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An electronic switching device employing a self-keeping type relay having an exciting coil (41), which comprises a signal generator (1), a first switching transistor (5) connected through a diode (43) to the coil, a second capacitor (42) connected in series with the coil, a second switching transist

An electronic switching device employing a self-keeping type relay having an exciting coil (41), which comprises a signal generator (1), a first switching transistor (5) connected through a diode (43) to the coil, a second capacitor (42) connected in series with the coil, a second switching transistor (44) connected across the coil and the second capacitor, a first capacitor connected across the second capacitor, the coil, the diode and the first switching transistor, a high resistance circuit (3) interposed between a power source (E) and the first capacitor, whereby the exciting coil is supplied with a positive momentary discharging current from the first capacitor through the first switching transistor so as to set the relay and the second capacitor and is supplied with a negative momentary discharging current from the second capacitor through the second switching transistor so as to reset the relay.

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An electronic switching device including a self-latching electromagnetic switch for switching a load connected to the switch, which comprises a self-latching relay circuit including an exciting coil, first switching means connected in series with said relay circuit for controlling an electric curren

An electronic switching device including a self-latching electromagnetic switch for switching a load connected to the switch, which comprises a self-latching relay circuit including an exciting coil, first switching means connected in series with said relay circuit for controlling an electric current applied to the same, current regulating means interposed between a power source and said relay circuit, a first capacitor connected across said relay circuit and said first switching means which are connected in series so as to be charged by said power source to a steady state value through said current regulating means within a predetermined time period, a signal generating means for generating an output signal which is applied to said first switching means as a controlling signal thereto, said controlling signal causing said first switching means to initiate a discharge of said first capacitor to produce a current in said exciting coil in a first direction, and, means for causing a discharge of current from said first capacitor to produce a current in said exciting coil in a second direction opposite to the first.