Configuration comprising a load apparatus and an apparatus for preventing a short circuit comprising: an input/output terminal unit configured to be electrically connected, via a second external power line (OL2), to the load apparatus that is electrically connectable to one of a driving voltage supply (Vo) and a ground (GND) via a first external power line (OL1); an internal power line (IL) configured to electrically connect one of the driving voltage supply (Vo) and the ground (GND) to the input/output terminal unit ; a switching unit configured to be mounted on the internal power line (IL), the switching unit having one end electrically connected to the input/output terminal unit and configured to energize or block the internal power line (IL); a variable resistor unit configured to be mounted on the internal power line (IL) and configured to be electrically connected to the other end of the switching unit ; and characterized by a control unit configured to determine whether the input/output terminal unit is shorted based on a measurement current value of a current flowing through the internal power line (IL) and control a set resistance value of the variable resistor unit in accordance with a result of the determination whether the input/output terminal unit is shorted, wherein, when the measurement current value exceeds a preset reference current value, the control unit determines that the input/output terminal unit is shorted, and wherein, when the input/output terminal unit is determined to be shorted as a result of the determination whether the input/output terminal unit is shorted, the control unit controls a set resistance value of the variable resistor unit to be a preset reference resistance value. an input/output terminal unit configured to be electrically connected, via a second external power line (OL2), to the load apparatus that is electrically connectable to one of a driving voltage supply (Vo) and a ground (GND) via a first external power line (OL1); an internal power line (IL) configured to electrically connect one of the driving voltage supply (Vo) and the ground (GND) to the input/output terminal unit ; a switching unit configured to be mounted on the internal power line (IL), the switching unit having one end electrically connected to the input/output terminal unit and configured to energize or block the internal power line (IL); a variable resistor unit configured to be mounted on the internal power line (IL) and configured to be electrically connected to the other end of the switching unit ; and characterized by a control unit configured to determine whether the input/output terminal unit is shorted based on a measurement current value of a current flowing through the internal power line (IL) and control a set resistance value of the variable resistor unit in accordance with a result of the determination whether the input/output terminal unit is shorted, wherein, when the measurement current value exceeds a preset reference current value, the control unit determines that the input/output terminal unit is shorted, and wherein, when the input/output terminal unit is determined to be shorted as a result of the determination whether the input/output terminal unit is shorted, the control unit controls a set resistance value of the variable resistor unit to be a preset reference resistance value. <EOS>