A direct current (DC) circuit breaker (100) for power transmission or distribution system includes a current sensor (CS) for sensing current of a system, a controller (140), a physical switch (K), and multiple switch modules (12). The multiple switch modules (12) are electrically coupled to the current sensor (CS) and the physical switch (K) in series. Each switch module (12) includes multiple base elements electrically coupled in parallel. Each base element includes a first silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) and a second SiC MOSFET electrically coupled in an opposite series connection mode. The first and second SiC MOSFETs are configured in a synchronous rectification mode by channel reverse conduction control. The controller (140) controls the multiple switch modules (12) to connect current in the system, and break current of the multiple switch modules according to sensed current signals from the current sensor (CS).