The invention relates to an electric switching device (10) for an energy accumulator in an electric vehicle, comprising a housing (20) inside which at least one switching section (30) that includes two input contacts (32a, 32b) and at least one output contact (34) is arranged, and a rotary component (40) which is mounted in such a way as to be rotatable relative to the housing (20) about a switching axis (42) between at least one OFF position (I), a series-connecting position (II), and an ON position (III); said rotary component (40) includes at least one conductor (44) which has at least two conductor contacts (44a, 44b) and which connects the first input contact (32a) in an electrically conducting manner to the output contact (34) in the series-connecting position (II) and connects the second input contact (32b) in an electrically conducting manner to the output contact (34) of the at least one switching section (30) in the ON position (III).

An automatic pre-charge device that eliminates the need for small contactors in high power contactor control circuits. To accomplish this, the device includes plurality of contactors, and an automated control board unit that has multiple interfaces for measuring and controlling the charging process. Further, the device reduces the number of additional wires and electrical connections, or reduces port count, thereby reducing the cost of the entire device. Furthermore, the device enables two methods of pre-charging that provide improved reliability and faster charging. Additionally, the device includes a programmable and automated digital control board that enables remote control as well as real time data acquisition information. Thus, the device is a smart and cost-effective addition to high power electronic circuits, for automatic pre-charge and surge protection.