The invention provides a microsecond electronic switch apparatus. The microsecond electronic switch apparatus comprises two IGBTs, two diodes, five heat dissipation plates, two press-mounting plates,an absorption capacitor and a direct-current bus capacitor group, thereby finally implementing microsecond turn-off. According to the microsecond electronic switch apparatus, the microsecond protection can be implemented; moreover, a protected current grade is relatively high and can be up to a grade of a current flowing through a device in a testing process; the microsecond electronic switch apparatus can implement the effects that when the protection switch is turned off, an overvoltage is relatively low, the voltage equalization performance is good, and an output voltage and an output current can be improved to a required range; not only is the cost saved, but an inductance value of a parasitic inductor also is reduced; and the diode and the absorption capacitor are arranged, so the possibility that the device is broken through by the overvoltage is avoided, and the voltage equalization is implemented via a static partial voltage of an equalization resistor.