Circuit breaker using semiconductor

A solid state circuit breaker disposed between a power supply unit and a supply target unit, the solid state circuit breaker comprising:

• a semiconductor switch unit comprising a plurality of semiconductor switches in which a maximum magnitude of a current supplied from the power supply unit to the supply target unit is determined according to gate voltages applied to gate terminals;
• a plurality of gate drivers that apply the gate voltages to the respective plurality of semiconductor switches;
• one or more first current sensors provided at one or more of a first point that is a front end of the semiconductor switch unit, a second point that is between the plurality of semiconductor switches, and a third point that is a rear end of the semiconductor switch unit to sense an inflow current flowing into the semiconductor switch unit;
• one or more second current sensors that are different types from the first current sensors, and provided at one or more of the first point, the second point and the third point to sense the inflow current;
• and
• a control unit that determines whether the inflow current is a fault current based on a first sensing result of the first current sensor and a second sensing result of the second current sensor to control the plurality of gate drivers according to a result of the determination.